Report Analysis

Generated at 2020-10-11T17:03:52+0000 for charles.hoffman@me.com. This page will remain online for about 48 hours.

Report

Submitted: https://www.sec.gov/Archives/edgar/data/1326801/000132680119000009/fb-20181231.xml
For more information: http://logicalcontracts.com/xbrl-and-sbrm-reporting/
DISCLAIMER: this analysis is provided by software still under development, and likely incomplete or even erroneous; do NOT use it other than for experimental, inconsequential purposes

User Alterations

NONE

	TERMS
0001000 - Document - Document and Entity Information	Structures	Facts
1001000 - Statement - CONSOLIDATED BALANCE SHEETS	Structures	Facts
1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)	Structures	Facts
1002000 - Statement - CONSOLIDATED STATEMENTS OF INCOME	Structures	Facts
1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME	Structures	Facts
1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY	Structures	Facts
1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS	Structures	Facts
2101100 - Disclosure - Summary of Significant Accounting Policies	Structures	Facts
2103100 - Disclosure - Earnings per Share	Structures	Facts
2104100 - Disclosure - Cash and Cash Equivalents, and Marketable Securities	Structures	Facts
2106100 - Disclosure - Fair Value Measurement	Structures	Facts
2107100 - Disclosure - Property and Equipment	Structures	Facts
2108100 - Disclosure - Goodwill and Intangible Assets	Structures	Facts
2109100 - Disclosure - Liabilities	Structures	Facts
2110100 - Disclosure - Long-term Debt	Structures	Facts
2111100 - Disclosure - Commitments and Contingencies	Structures	Facts
2112100 - Disclosure - Stockholders' Equity	Structures	Facts
2113100 - Disclosure - Interest and other income (expense), net	Structures	Facts
2114100 - Disclosure - Income Taxes	Structures	Facts
2115100 - Disclosure - Geographical Information	Structures	Facts
2201201 - Disclosure - Summary of Significant Accounting Policies (Policies)	Structures	Facts
2301302 - Disclosure - Summary of Significant Accounting Policies (Tables)	Structures	Facts
2303301 - Disclosure - Earnings per Share (Tables)	Structures	Facts
2304301 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Tables)	Structures	Facts
2306301 - Disclosure - Fair Value Measurement (Tables)	Structures	Facts
2307301 - Disclosure - Property and Equipment (Tables)	Structures	Facts
2308301 - Disclosure - Goodwill and Intangible Assets (Tables)	Structures	Facts
2309301 - Disclosure - Liabilities (Tables)	Structures	Facts
2311301 - Disclosure - Commitments and Contingencies (Tables)	Structures	Facts
2312301 - Disclosure - Stockholders' Equity (Tables)	Structures	Facts
2313301 - Disclosure - Interest and other income (expense), net (Tables)	Structures	Facts
2314301 - Disclosure - Income Taxes (Tables)	Structures	Facts
2315301 - Disclosure - Geographical Information (Tables)	Structures	Facts
2401403 - Disclosure - Summary of Significant Accounting Policies - Disaggregated Revenue (Details)	Structures	Facts
2401404 - Disclosure - Summary of Significant Accounting Policies - Deferred Revenue and Deposits (Details)	Structures	Facts
2401405 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details)	Structures	Facts
2403402 - Disclosure - Earnings per Share (Details)	Structures	Facts
2404402 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Details)	Structures	Facts
2404403 - Disclosure - Cash and Cash Equivalents, and Marketable Securities - Contractual Maturities of Debt Securities (Details)	Structures	Facts
2406402 - Disclosure - Fair Value Measurement (Details)	Structures	Facts
2407402 - Disclosure - Property and Equipment (Detail)	Structures	Facts
2408402 - Disclosure - Goodwill and Intangible Assets - Change in Carrying Amount (Details)	Structures	Facts
2408403 - Disclosure - Goodwill and Intangible Assets - Intangible Assets (Detail)	Structures	Facts
2408404 - Disclosure - Goodwill and Intangible Assets - Amortization Expense (Details)	Structures	Facts
2409402 - Disclosure - Liabilities (Details)	Structures	Facts
2410401 - Disclosure - Long-term Debt - Borrowings (Details)	Structures	Facts
2411402 - Disclosure - Commitments and Contingencies (Details)	Structures	Facts
2412402 - Disclosure - Stockholders' Equity - Common Stock (Details)	Structures	Facts
2412403 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details)	Structures	Facts
2412404 - Disclosure - Stockholders' Equity - Share-based Compensation Plans (Detail)	Structures	Facts
2412405 - Disclosure - Stockholders' Equity - Stock Option Award Activity (Details)	Structures	Facts
2412406 - Disclosure - Stockholders' Equity - RSU Award Activity (Details)	Structures	Facts
2412407 - Disclosure - Stockholders' Equity - Additional Award Disclosures (Details)	Structures	Facts
2413402 - Disclosure - Interest and other income (expense), net (Details)	Structures	Facts
2414402 - Disclosure - Income Taxes - Schedule for Income Before Income Tax (Details)	Structures	Facts
2414403 - Disclosure - Income Taxes - Provision for Income Taxes (Details)	Structures	Facts
2414404 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Details)	Structures	Facts
2414405 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details)	Structures	Facts
2414406 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details)	Structures	Facts
2414407 - Disclosure - Income Taxes - Narrative (Detail)	Structures	Facts
2415402 - Disclosure - Geographical Information - Property and Equipment (Details)	Structures	Facts
	RULES
	Errors and Warnings

Terms

Terms shown are only those effectively used by the report instance.

#	Label	Data Type	Period Type	Balance Type	Abstract	Prefix	Name, Documentation, References
1	Asia Pacific [Member]	nonnum:domainItemType	duration		true	srt	AsiaPacificMember
2	srt:AffiliatedEntityMember (label)	nonnum:domainItemType	duration		true	srt	AffiliatedEntityMember
3	Europe [Member]	nonnum:domainItemType	duration		true	srt	EuropeMember
4	Maximum [Member]	nonnum:domainItemType	duration		true	srt	MaximumMember
5	Minimum [Member]	nonnum:domainItemType	duration		true	srt	MinimumMember
6	Product and Service [Domain]	nonnum:domainItemType	duration		true	srt	ProductsAndServicesDomain
7	Product and Service [Axis]	xbrli:stringItemType	duration		true	srt	ProductOrServiceAxis
8	Range [Domain]	nonnum:domainItemType	duration		true	srt	RangeMember
9	Range [Axis]	xbrli:stringItemType	duration		true	srt	RangeAxis
10	srt:RepurchaseAgreementCounterpartyNameDomain (label)	nonnum:domainItemType	duration		true	srt	RepurchaseAgreementCounterpartyNameDomain
11	Geographical [Domain]	nonnum:domainItemType	duration		true	srt	SegmentGeographicalDomain
12	Geographical [Axis]	xbrli:stringItemType	duration		true	srt	StatementGeographicalAxis
13	srt:SubsidiariesMember (label)	nonnum:domainItemType	duration		true	srt	SubsidiariesMember
14	country:CA (label)	nonnum:domainItemType	duration		true	country	CA
15	country:GB (label)	nonnum:domainItemType	duration		true	country	GB
16	UNITED STATES	nonnum:domainItemType	duration		true	country	US
17	Award Type [Axis]	xbrli:stringItemType	duration		true	us-gaap	AwardTypeAxis
18	us-gaap:AccidentAndHealthInsuranceSegmentMember (label)	nonnum:domainItemType	duration		true	us-gaap	AccidentAndHealthInsuranceSegmentMember
19	Accounting Policies [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AccountingPoliciesAbstract
20	Accounting Standards Update 2016-02 [Member]	nonnum:domainItemType	duration		true	us-gaap	AccountingStandardsUpdate201602Member
21	Accounts Payable, Current	xbrli:monetaryItemType	instant	credit		us-gaap	AccountsPayableCurrent
22	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent (label)	xbrli:monetaryItemType	instant	credit		us-gaap	AccountsPayableAndAccruedLiabilitiesCurrent
23	Accounts Payable and Accrued Liabilities [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
24	Accounts Receivable, Net, Current	xbrli:monetaryItemType	instant	debit		us-gaap	AccountsReceivableNetCurrent
25	Accounts Payable, Other, Current	xbrli:monetaryItemType	instant	credit		us-gaap	AccountsPayableOtherCurrent
26	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent (label)	xbrli:monetaryItemType	instant	credit		us-gaap	AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
27	Accrued Liabilities, Current	xbrli:monetaryItemType	instant	credit		us-gaap	AccruedLiabilitiesCurrent
28	us-gaap:AccruedInvestmentIncomeReceivable (label)	xbrli:monetaryItemType	instant	debit		us-gaap	AccruedInvestmentIncomeReceivable
29	Accrued Liabilities and Other Liabilities [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AccruedLiabilitiesAndOtherLiabilitiesAbstract
30	us-gaap:AccruedLiabilitiesMember (label)	nonnum:domainItemType	duration		true	us-gaap	AccruedLiabilitiesMember
31	us-gaap:AccruedIncomeTaxesNoncurrent (label)	xbrli:monetaryItemType	instant	credit		us-gaap	AccruedIncomeTaxesNoncurrent
32	Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	xbrli:monetaryItemType	instant	credit		us-gaap	AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
33	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	xbrli:monetaryItemType	instant	credit		us-gaap	AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
34	AOCI Attributable to Parent [Member]	nonnum:domainItemType	duration		true	us-gaap	AccumulatedOtherComprehensiveIncomeMember
35	Accumulated Other Comprehensive Income (Loss), Net of Tax	xbrli:monetaryItemType	instant	credit		us-gaap	AccumulatedOtherComprehensiveIncomeLossNetOfTax
36	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	xbrli:durationItemType	duration			us-gaap	AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
37	Additional Paid in Capital	xbrli:monetaryItemType	instant	credit		us-gaap	AdditionalPaidInCapital
38	Additional Paid-in Capital [Member]	nonnum:domainItemType	duration		true	us-gaap	AdditionalPaidInCapitalMember
39	Adjustments Related to Tax Withholding for Share-based Compensation	xbrli:monetaryItemType	duration	debit		us-gaap	AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
40	Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
41	Adjustments for New Accounting Pronouncements [Axis]	xbrli:stringItemType	duration		true	us-gaap	AdjustmentsForNewAccountingPronouncementsAxis
42	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	xbrli:monetaryItemType	duration	credit		us-gaap	AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
43	Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	AdvertisingCostPolicyExpensedAdvertisingCost
44	Advertising Expense	xbrli:monetaryItemType	duration	debit		us-gaap	AdvertisingExpense
45	Advertising [Member]	nonnum:domainItemType	duration		true	us-gaap	AdvertisingMember
46	us-gaap:AllOtherSegmentsMember (label)	nonnum:domainItemType	duration		true	us-gaap	AllOtherSegmentsMember
47	Allocated Share-based Compensation Expense	xbrli:monetaryItemType	duration	debit		us-gaap	AllocatedShareBasedCompensationExpense
48	Allowance for Doubtful Accounts Receivable, Current	xbrli:monetaryItemType	instant	credit		us-gaap	AllowanceForDoubtfulAccountsReceivableCurrent
49	us-gaap:AmortizationOfDeferredCharges (label)	xbrli:monetaryItemType	duration	debit		us-gaap	AmortizationOfDeferredCharges
50	Amortization of Intangible Assets	xbrli:monetaryItemType	duration	debit		us-gaap	AmortizationOfIntangibleAssets
51	us-gaap:AssetPledgedAsCollateralMember (label)	nonnum:domainItemType	duration		true	us-gaap	AssetPledgedAsCollateralMember
52	us-gaap:AssetManagementArrangementMember (label)	nonnum:domainItemType	duration		true	us-gaap	AssetManagementArrangementMember
53	us-gaap:AssetHeldInTrustMember (label)	nonnum:domainItemType	duration		true	us-gaap	AssetHeldInTrustMember
54	Assets [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AssetsAbstract
55	Assets, Fair Value Disclosure	xbrli:monetaryItemType	instant	debit		us-gaap	AssetsFairValueDisclosure
56	Assets	xbrli:monetaryItemType	instant	debit		us-gaap	Assets
57	Assets, Current	xbrli:monetaryItemType	instant	debit		us-gaap	AssetsCurrent
58	Assets, Current [Abstract]	xbrli:stringItemType	duration		true	us-gaap	AssetsCurrentAbstract
59	us-gaap:AssetsNoncurrentAbstract (label)	xbrli:stringItemType	duration		true	us-gaap	AssetsNoncurrentAbstract
60	Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	xbrli:monetaryItemType	instant	debit		us-gaap	AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
61	Debt Securities, Available-for-sale, Current	xbrli:monetaryItemType	instant	debit		us-gaap	AvailableForSaleSecuritiesDebtSecuritiesCurrent
62	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	xbrli:monetaryItemType	instant	debit		us-gaap	AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
63	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	xbrli:monetaryItemType	instant	debit		us-gaap	AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
64	Balance Sheet Location [Domain]	nonnum:domainItemType	duration		true	us-gaap	BalanceSheetLocationDomain
65	Balance Sheet Location [Axis]	xbrli:stringItemType	duration		true	us-gaap	BalanceSheetLocationAxis
66	Bank Time Deposits [Member]	nonnum:domainItemType	duration		true	us-gaap	BankTimeDepositsMember
67	us-gaap:BasisSwapMember (label)	nonnum:domainItemType	duration		true	us-gaap	BasisSwapMember
68	Basis of Accounting, Policy [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	BasisOfAccountingPolicyPolicyTextBlock
69	Basis of Presentation and Significant Accounting Policies [Text Block]	nonnum:textBlockItemType	duration			us-gaap	BasisOfPresentationAndSignificantAccountingPoliciesTextBlock
70	us-gaap:BondFutureMember (label)	nonnum:domainItemType	duration		true	us-gaap	BondFutureMember
71	us-gaap:BondOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	BondOptionMember
72	Building [Member]	nonnum:domainItemType	duration		true	us-gaap	BuildingMember
73	Business Combinations Policy [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	BusinessCombinationsPolicy
74	us-gaap:CapitalSupportAgreementMember (label)	nonnum:domainItemType	duration		true	us-gaap	CapitalSupportAgreementMember
75	us-gaap:CapitalLeaseObligationsNoncurrent (label)	xbrli:monetaryItemType	instant	credit		us-gaap	CapitalLeaseObligationsNoncurrent
76	Capital Leased Assets, Gross	xbrli:monetaryItemType	instant	debit		us-gaap	CapitalLeasedAssetsGross
77	Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	xbrli:monetaryItemType	instant	credit		us-gaap	CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
78	Cash, Cash Equivalents, and Short-term Investments [Text Block]	nonnum:textBlockItemType	duration			us-gaap	CashCashEquivalentsAndShortTermInvestmentsTextBlock
79	Cash and Cash Equivalents, Fair Value Disclosure	xbrli:monetaryItemType	instant	debit		us-gaap	CashAndCashEquivalentsFairValueDisclosure
80	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract]	xbrli:stringItemType	duration		true	us-gaap	CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract
81	Cash [Member]	nonnum:domainItemType	duration		true	us-gaap	CashMember
82	Cash and Cash Equivalents, at Carrying Value	xbrli:monetaryItemType	instant	debit		us-gaap	CashAndCashEquivalentsAtCarryingValue
83	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	xbrli:monetaryItemType	instant	debit		us-gaap	CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
84	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	xbrli:monetaryItemType	duration	debit		us-gaap	CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
85	Cash and Cash Equivalents [Axis]	xbrli:stringItemType	duration		true	us-gaap	CashAndCashEquivalentsAxis
86	Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]	xbrli:stringItemType	duration		true	us-gaap	CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
87	us-gaap:ChangeInValuationTechniqueReasonInactiveMarketMember (label)	nonnum:domainItemType	duration		true	us-gaap	ChangeInValuationTechniqueReasonInactiveMarketMember
88	us-gaap:ChangeInValuationTechniqueReasonCurrentAppraisalUnobtainableMember (label)	nonnum:domainItemType	duration		true	us-gaap	ChangeInValuationTechniqueReasonCurrentAppraisalUnobtainableMember
89	us-gaap:ChangeInValuationTechniqueAbstract (label)	xbrli:stringItemType	duration		true	us-gaap	ChangeInValuationTechniqueAbstract
90	Class of Stock [Line Items]	xbrli:stringItemType	duration		true	us-gaap	ClassOfStockLineItems
91	Class of Stock [Domain]	nonnum:domainItemType	duration		true	us-gaap	ClassOfStockDomain
92	Commitments and Contingencies Disclosure [Text Block]	nonnum:textBlockItemType	duration			us-gaap	CommitmentsAndContingenciesDisclosureTextBlock
93	us-gaap:CommitmentsToExtendCreditMember (label)	nonnum:domainItemType	duration		true	us-gaap	CommitmentsToExtendCreditMember
94	Commitments and Contingencies Disclosure [Abstract]	xbrli:stringItemType	duration		true	us-gaap	CommitmentsAndContingenciesDisclosureAbstract
95	Commitments and Contingencies, Policy [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	CommitmentsAndContingenciesPolicyTextBlock
96	Commitments and Contingencies	xbrli:monetaryItemType	instant	credit		us-gaap	CommitmentsAndContingencies
97	us-gaap:CommoditiesInvestmentMember (label)	nonnum:domainItemType	duration		true	us-gaap	CommoditiesInvestmentMember
98	us-gaap:CommodityOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	CommodityOptionMember
99	Common Class A [Member]	nonnum:domainItemType	duration		true	us-gaap	CommonClassAMember
100	Common Stock [Member]	nonnum:domainItemType	duration		true	us-gaap	CommonStockMember
101	Common Stock, Shares Authorized	xbrli:sharesItemType	instant			us-gaap	CommonStockSharesAuthorized
102	Common Class B [Member]	nonnum:domainItemType	duration		true	us-gaap	CommonClassBMember
103	Common Stock, Par or Stated Value Per Share	num:perShareItemType	instant			us-gaap	CommonStockParOrStatedValuePerShare
104	Common Stock, Capital Shares Reserved for Future Issuance	xbrli:sharesItemType	instant			us-gaap	CommonStockCapitalSharesReservedForFutureIssuance
105	Common Stock, Shares, Issued	xbrli:sharesItemType	instant			us-gaap	CommonStockSharesIssued
106	Common Stock, Shares, Outstanding	xbrli:sharesItemType	instant			us-gaap	CommonStockSharesOutstanding
107	Common Stock, Value, Issued	xbrli:monetaryItemType	instant	credit		us-gaap	CommonStockValue
108	Components of Deferred Tax Assets [Abstract]	xbrli:stringItemType	duration		true	us-gaap	ComponentsOfDeferredTaxAssetsAbstract
109	Components of Deferred Tax Liabilities [Abstract]	xbrli:stringItemType	duration		true	us-gaap	ComponentsOfDeferredTaxLiabilitiesAbstract
110	Components of Deferred Tax Assets and Liabilities [Abstract]	xbrli:stringItemType	duration		true	us-gaap	ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract
111	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	xbrli:monetaryItemType	duration	credit		us-gaap	ComprehensiveIncomeNetOfTax
112	Computer Equipment [Member]	nonnum:domainItemType	duration		true	us-gaap	ComputerEquipmentMember
113	Concentration Risk Type [Domain]	nonnum:domainItemType	duration		true	us-gaap	ConcentrationRiskTypeDomain
114	Concentration Risk, Credit Risk, Policy [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	ConcentrationRiskCreditRisk
115	Concentration Risk Benchmark [Axis]	xbrli:stringItemType	duration		true	us-gaap	ConcentrationRiskByBenchmarkAxis
116	Concentration Risk Type [Axis]	xbrli:stringItemType	duration		true	us-gaap	ConcentrationRiskByTypeAxis
117	Concentration Risk Benchmark [Domain]	nonnum:domainItemType	duration		true	us-gaap	ConcentrationRiskBenchmarkDomain
118	Concentration Risk, Percentage	num:percentItemType	duration			us-gaap	ConcentrationRiskPercentage1
119	Construction in Progress [Member]	nonnum:domainItemType	duration		true	us-gaap	ConstructionInProgressMember
120	Contract with Customer, Liability	xbrli:monetaryItemType	instant	credit		us-gaap	ContractWithCustomerLiability
121	Contract with Customer, Liability, Current	xbrli:monetaryItemType	instant	credit		us-gaap	ContractWithCustomerLiabilityCurrent
122	Contract with Customer, Asset and Liability [Table Text Block]	nonnum:textBlockItemType	duration			us-gaap	ContractWithCustomerAssetAndLiabilityTableTextBlock
123	Contractual Obligation	xbrli:monetaryItemType	instant	credit		us-gaap	ContractualObligation
124	Corporate Debt Securities [Member]	nonnum:domainItemType	duration		true	us-gaap	CorporateDebtSecuritiesMember
125	us-gaap:CorporateMember (label)	nonnum:domainItemType	duration		true	us-gaap	CorporateMember
126	us-gaap:CorporateAndOtherMember (label)	nonnum:domainItemType	duration		true	us-gaap	CorporateAndOtherMember
127	us-gaap:CostOfServicesExcludingDepreciationDepletionAndAmortization (label)	xbrli:monetaryItemType	duration	debit		us-gaap	CostOfServicesExcludingDepreciationDepletionAndAmortization
128	us-gaap:CostOfGoodsAndServicesSold (label)	xbrli:monetaryItemType	duration	debit		us-gaap	CostOfGoodsAndServicesSold
129	us-gaap:CostApproachValuationTechniqueMember (label)	nonnum:domainItemType	duration		true	us-gaap	CostApproachValuationTechniqueMember
130	us-gaap:CostDirectLabor (label)	xbrli:monetaryItemType	duration	debit		us-gaap	CostDirectLabor
131	Cost of Sales [Member]	nonnum:domainItemType	duration		true	us-gaap	CostOfSalesMember
132	Cost of Revenue	xbrli:monetaryItemType	duration	debit		us-gaap	CostOfRevenue
133	Costs and Expenses [Abstract]	xbrli:stringItemType	duration		true	us-gaap	CostsAndExpensesAbstract
134	Costs and Expenses	xbrli:monetaryItemType	duration	debit		us-gaap	CostsAndExpenses
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136	us-gaap:CreditSpreadOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	CreditSpreadOptionMember
137	us-gaap:CreditDefaultOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	CreditDefaultOptionMember
138	us-gaap:CreditDefaultSwapMember (label)	nonnum:domainItemType	duration		true	us-gaap	CreditDefaultSwapMember
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142	Current Income Tax Expense (Benefit)	xbrli:monetaryItemType	duration	debit		us-gaap	CurrentIncomeTaxExpenseBenefit
143	Current Foreign Tax Expense (Benefit)	xbrli:monetaryItemType	duration	debit		us-gaap	CurrentForeignTaxExpenseBenefit
144	Current Income Tax Expense (Benefit), Continuing Operations [Abstract]	xbrli:stringItemType	duration		true	us-gaap	CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract
145	Current Federal Tax Expense (Benefit)	xbrli:monetaryItemType	duration	debit		us-gaap	CurrentFederalTaxExpenseBenefit
146	Disaggregation of Revenue [Line Items]	xbrli:stringItemType	duration		true	us-gaap	DisaggregationOfRevenueLineItems
147	Disaggregation of Revenue [Table]	xbrli:stringItemType	duration		true	us-gaap	DisaggregationOfRevenueTable
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678	Type of Adoption [Domain]	nonnum:domainItemType	duration		true	us-gaap	TypeOfAdoptionMember
679	us-gaap:TotalReturnSwapMember (label)	nonnum:domainItemType	duration		true	us-gaap	TotalReturnSwapMember
680	us-gaap:UnderfundedPlanMember (label)	nonnum:domainItemType	duration		true	us-gaap	UnderfundedPlanMember
681	us-gaap:UnfundedPlanMember (label)	nonnum:domainItemType	duration		true	us-gaap	UnfundedPlanMember
682	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	xbrli:monetaryItemType	duration	debit		us-gaap	UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
683	us-gaap:UniversalLifeMember (label)	nonnum:domainItemType	duration		true	us-gaap	UniversalLifeMember
684	Unrecognized Tax Benefits that Would Impact Effective Tax Rate	xbrli:monetaryItemType	instant	credit		us-gaap	UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
685	Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	xbrli:monetaryItemType	duration	debit		us-gaap	UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
686	Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	xbrli:monetaryItemType	duration	credit		us-gaap	UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
687	Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	xbrli:monetaryItemType	duration	debit		us-gaap	UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
688	Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	xbrli:monetaryItemType	duration	credit		us-gaap	UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
689	Unrecognized Tax Benefits	xbrli:monetaryItemType	instant	credit		us-gaap	UnrecognizedTaxBenefits
690	us-gaap:UnusedLinesOfCreditMember (label)	nonnum:domainItemType	duration		true	us-gaap	UnusedLinesOfCreditMember
691	Use of Estimates, Policy [Policy Text Block]	nonnum:textBlockItemType	duration			us-gaap	UseOfEstimates
692	US Government Debt Securities [Member]	nonnum:domainItemType	duration		true	us-gaap	USGovernmentDebtSecuritiesMember
693	US Government Agencies Debt Securities [Member]	nonnum:domainItemType	duration		true	us-gaap	USGovernmentAgenciesDebtSecuritiesMember
694	us-gaap:UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses (label)	xbrli:monetaryItemType	duration	debit		us-gaap	UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
695	us-gaap:UtilitiesOperatingExpense (label)	xbrli:monetaryItemType	duration	debit		us-gaap	UtilitiesOperatingExpense
696	us-gaap:ValuationTechniqueOptionPricingModelMember (label)	nonnum:domainItemType	duration		true	us-gaap	ValuationTechniqueOptionPricingModelMember
697	us-gaap:ValuationTechniqueDiscountedCashFlowMember (label)	nonnum:domainItemType	duration		true	us-gaap	ValuationTechniqueDiscountedCashFlowMember
698	us-gaap:ValuationTechniqueMatrixPricingMember (label)	nonnum:domainItemType	duration		true	us-gaap	ValuationTechniqueMatrixPricingMember
699	us-gaap:ValuationTechniqueConsensusPricingModelMember (label)	nonnum:domainItemType	duration		true	us-gaap	ValuationTechniqueConsensusPricingModelMember
700	us-gaap:ValuationTechniqueDomain (label)	nonnum:domainItemType	duration		true	us-gaap	ValuationTechniqueDomain
701	us-gaap:VariableAnnuityMember (label)	nonnum:domainItemType	duration		true	us-gaap	VariableAnnuityMember
702	us-gaap:VariableLifeMember (label)	nonnum:domainItemType	duration		true	us-gaap	VariableLifeMember
703	us-gaap:VentureCapitalFundsMember (label)	nonnum:domainItemType	duration		true	us-gaap	VentureCapitalFundsMember
704	us-gaap:VarianceSwapMember (label)	nonnum:domainItemType	duration		true	us-gaap	VarianceSwapMember
705	us-gaap:WarrantMember (label)	nonnum:domainItemType	duration		true	us-gaap	WarrantMember
706	us-gaap:WarrantyRightsAndObligationsFairValueOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	WarrantyRightsAndObligationsFairValueOptionMember
707	Weighted Average Number of Shares Outstanding, Basic	xbrli:sharesItemType	duration			us-gaap	WeightedAverageNumberOfSharesOutstandingBasic
708	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	xbrli:sharesItemType	duration			us-gaap	WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
709	Weighted Average Number of Shares Outstanding, Diluted	xbrli:sharesItemType	duration			us-gaap	WeightedAverageNumberOfDilutedSharesOutstanding
710	Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]	xbrli:stringItemType	duration		true	us-gaap	WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract
711	Weighted Average Number of Shares Outstanding, Basic [Abstract]	xbrli:stringItemType	duration		true	us-gaap	WeightedAverageNumberOfSharesOutstandingBasicAbstract
712	Weighted Average Number of Shares Outstanding Reconciliation [Abstract]	xbrli:stringItemType	duration		true	us-gaap	WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract
713	us-gaap:WrittenLoanCommitmentFairValueOptionMember (label)	nonnum:domainItemType	duration		true	us-gaap	WrittenLoanCommitmentFairValueOptionMember
714	Amendment Flag	xbrli:booleanItemType	duration			dei	AmendmentFlag
715	Current Fiscal Year End Date	xbrli:gMonthDayItemType	duration			dei	CurrentFiscalYearEndDate
716	Document Period End Date	xbrli:dateItemType	duration			dei	DocumentPeriodEndDate
717	Entities [Table]	xbrli:stringItemType	duration		true	dei	EntitiesTable
718	Entity Information [Line Items]	xbrli:stringItemType	duration		true	dei	EntityInformationLineItems
719	Trading Symbol	xbrli:normalizedStringItemType	duration			dei	TradingSymbol
720	Entity Well-known Seasoned Issuer	dei:yesNoItemType	duration			dei	EntityWellKnownSeasonedIssuer
721	Entity Voluntary Filers	dei:yesNoItemType	duration			dei	EntityVoluntaryFilers
722	Entity Current Reporting Status	dei:yesNoItemType	duration			dei	EntityCurrentReportingStatus
723	Entity Filer Category	dei:filerCategoryItemType	duration			dei	EntityFilerCategory
724	Entity Public Float	xbrli:monetaryItemType	instant	credit		dei	EntityPublicFloat
725	Entity Registrant Name	xbrli:normalizedStringItemType	duration			dei	EntityRegistrantName
726	Entity Central Index Key	dei:centralIndexKeyItemType	duration			dei	EntityCentralIndexKey
727	Entity Common Stock, Shares Outstanding	xbrli:sharesItemType	instant			dei	EntityCommonStockSharesOutstanding
728	Document Fiscal Year Focus	xbrli:gYearItemType	duration			dei	DocumentFiscalYearFocus
729	Document Fiscal Period Focus	dei:fiscalPeriodItemType	duration			dei	DocumentFiscalPeriodFocus
730	Document Type	dei:submissionTypeItemType	duration			dei	DocumentType
731	Entity Shell Company	xbrli:booleanItemType	duration			dei	EntityShellCompany
732	Entity Emerging Growth Company	xbrli:booleanItemType	duration			dei	EntityEmergingGrowthCompany
733	Entity Small Business	xbrli:booleanItemType	duration			dei	EntitySmallBusiness
734	fb:AccountsPayableAccruedLiabilitiesandOtherLiabilitiesDisclosureCurrentandNoncurrentTextBlock (label)	nonnum:textBlockItemType	duration			fb	AccountsPayableAccruedLiabilitiesandOtherLiabilitiesDisclosureCurrentandNoncurrentTextBlock Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current and Noncurrent [Text Block]
735	fb:AcquiredusersMember (label)	nonnum:domainItemType	duration		true	fb	AcquiredusersMember Acquired users [Member]
736	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract (label)	xbrli:stringItemType	duration		true	fb	CashAndCashEquivalentsAndMarketableSecuritiesAbstract Cash and Cash Equivalents, and Marketable Securities [Abstract]
737	fb:CashAndCashEquivalentsAndMarketableSecuritiesPolicyTextBlock (label)	nonnum:textBlockItemType	duration			fb	CashAndCashEquivalentsAndMarketableSecuritiesPolicyTextBlock Cash and Cash Equivalents, and Marketable Securities [Policy Text Block]
738	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (label)	xbrli:monetaryItemType	instant	debit		fb	CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue Cash, Cash Equivalents And Marketable Securities, At Carrying Value
739	fb:CashCashEquivalentsAndMarketableSecuritiesLineItems (label)	xbrli:stringItemType	duration		true	fb	CashCashEquivalentsAndMarketableSecuritiesLineItems Cash, Cash Equivalents, and Marketable Securities [Line Items]
740	fb:CashPaidDuringPeriodForAbstract (label)	xbrli:stringItemType	duration		true	fb	CashPaidDuringPeriodForAbstract Cash Paid During Period For [Abstract]
741	fb:ChangeinUnsettledRepurchasesofCommonStock (label)	xbrli:monetaryItemType	duration	credit		fb	ChangeinUnsettledRepurchasesofCommonStock Change in Unsettled Repurchases of Common Stock
742	fb:CommitmentsAndContingenciesDisclosureLineItems (label)	xbrli:stringItemType	duration		true	fb	CommitmentsAndContingenciesDisclosureLineItems Commitments and Contingencies Disclosure [Line Items]
743	fb:CommitmentsAndContingenciesDisclosureTable (label)	xbrli:stringItemType	duration		true	fb	CommitmentsAndContingenciesDisclosureTable Commitments and Contingencies Disclosure [Table]
744	fb:CommonStockNumberOfVotesByClass (label)	xbrli:integerItemType	instant			fb	CommonStockNumberOfVotesByClass Common Stock, Number of Votes by Class
745	fb:ComputerSoftwareOfficeEquipmentAndOtherMember (label)	nonnum:domainItemType	duration		true	fb	ComputerSoftwareOfficeEquipmentAndOtherMember Computer Software Office Equipment and Other [Member]
746	fb:ContractWithCustomerDepositsUnusedBalances (label)	xbrli:monetaryItemType	instant	credit		fb	ContractWithCustomerDepositsUnusedBalances Contract With Customer, Deposits, Unused Balances
747	fb:ContractWithCustomerLiabilityandUnusedDeposits (label)	xbrli:monetaryItemType	instant	credit		fb	ContractWithCustomerLiabilityandUnusedDeposits Contract With Customer, Liability and Unused Deposits
748	fb:ContractualObligationAbstract (label)	xbrli:stringItemType	duration		true	fb	ContractualObligationAbstract Contractual Obligation [Abstract]
749	fb:DocumentandEntityInformationAbstract (label)	xbrli:stringItemType	duration		true	fb	DocumentandEntityInformationAbstract Document and Entity Information [Abstract]
750	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent (label)	num:percentItemType	duration			fb	EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Percent
751	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent (label)	num:percentItemType	duration			fb	EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent Effective Tax Rate Reconciliation, Share-Based Compensation, Excess Tax Benefit, Percent
752	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod (label)	xbrli:durationItemType	duration			fb	EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod Event Causing Ownership Change and Loss in Net Operating Loss and Tax Credit Carryforward, Change in Ownership Percentage Over Period
753	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold (label)	num:percentItemType	instant			fb	EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold Event Causing Ownership Change and Loss in Net Operating Loss and Tax Credit Carryforward, Cumulative Stock Ownership Change Threshhold
754	fb:IncomeTaxDisclosureLineItems (label)	xbrli:stringItemType	duration		true	fb	IncomeTaxDisclosureLineItems Income Tax Disclosure [Line Items]
755	fb:IncomeTaxDisclosureTable (label)	xbrli:stringItemType	duration		true	fb	IncomeTaxDisclosureTable Income Tax Disclosure
756	fb:IncomeTaxesPayableNoncurrent (label)	xbrli:monetaryItemType	instant	credit		fb	IncomeTaxesPayableNoncurrent Income Taxes Payable, Noncurrent
757	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions (label)	xbrli:monetaryItemType	duration	credit		fb	IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions Increase (Decrease) in Prepaids and Liabilities Related to Property and Equipment Additions
758	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	xbrli:sharesItemType	duration			fb	IncrementalCommonSharesAttributableToConversionOfCommonStock Incremental Common Shares Attributable to Conversion of Common Stock
759	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	xbrli:sharesItemType	duration			fb	IncrementalCommonSharesAttributableToSharesSubjectToRepurchase Incremental Common Shares Attributable to Shares Subject to Repurchase
760	fb:LongLivedAssetsIncludingGoodwillAndIntangiblePolicyTextBlock (label)	nonnum:textBlockItemType	duration			fb	LongLivedAssetsIncludingGoodwillAndIntangiblePolicyTextBlock Long Lived Assets Including Goodwill and Intangible [Policy Text Block]
761	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption (label)	xbrli:monetaryItemType	instant	credit		fb	NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption New Accounting Pronouncement Or Tax Cuts And Jobs Act Of 2017, Effect Of Adoption
762	fb:NotionalCashPoolOverdraftBalance (label)	xbrli:monetaryItemType	instant	credit		fb	NotionalCashPoolOverdraftBalance Notional Cash Pool, Overdraft Balance
763	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax (label)	xbrli:monetaryItemType	duration	credit		fb	OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment and Other, Net of Tax
764	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets (label)	xbrli:monetaryItemType	duration	credit		fb	PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets Payments to Acquire Businesses, Net of Cash Acquired, and Purchases of Intangible and Other Assets
765	fb:PaymentsandOtherFeesMember (label)	nonnum:domainItemType	duration		true	fb	PaymentsandOtherFeesMember Payments and Other Fees [Member]
766	fb:PropertyPlantAndEqiupmentUsefulLifeTableTextBlock (label)	nonnum:textBlockItemType	duration			fb	PropertyPlantAndEqiupmentUsefulLifeTableTextBlock Property, Plant and Eqiupment, Useful Life [Table Text Block]
767	fb:PropertyandEquipmentAccruedLiabilities (label)	xbrli:monetaryItemType	instant	credit		fb	PropertyandEquipmentAccruedLiabilities Property and Equipment Accrued Liabilities
768	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	xbrli:monetaryItemType	duration	credit		fb	ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares Reallocation of Net Income as Result of Conversion of Class B to Class A Shares
769	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	xbrli:monetaryItemType	duration	credit		fb	ReallocationOfNetIncomeAttributableToParticipatingSecurities Reallocation of Net Income Attributable to Participating Securities
770	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	xbrli:monetaryItemType	duration	credit		fb	ReallocationOfNetIncomeToClassBCommonStock Reallocation of Net Income to Class B Common Stock
771	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations (label)	xbrli:monetaryItemType	duration	credit		fb	RepaymentsOfCapitalLeaseAndOtherFinancingObligations Repayments Of Capital Lease And Other Financing Obligations
772	fb:RestOfWorldMember (label)	nonnum:domainItemType	duration		true	fb	RestOfWorldMember Rest of World [Member]
773	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	num:percentItemType	duration			fb	RevenueRemainingPerformanceObligationAmountPayablePercentage Revenue, Remaining Performance Obligation, Amount Payable, Percentage
774	fb:ScheduleOfCashCashEquivalentsAndMarketableSecuritiesTable (label)	xbrli:stringItemType	duration		true	fb	ScheduleOfCashCashEquivalentsAndMarketableSecuritiesTable Schedule of Cash, Cash Equivalents And Marketable Securities [Table]
775	fb:SettlementOfContingentConsiderationLiability (label)	xbrli:monetaryItemType	duration	credit		fb	SettlementOfContingentConsiderationLiability Settlement Of Contingent Consideration Liability
776	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRollforwardAbstract (label)	xbrli:stringItemType	duration		true	fb	ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRollforwardAbstract Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Rollforward [Abstract]
777	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValueAbstract (label)	xbrli:stringItemType	duration		true	fb	ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValueAbstract Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]
778	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract (label)	xbrli:stringItemType	duration		true	fb	ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]
779	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract (label)	xbrli:stringItemType	duration		true	fb	ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]
780	fb:ShareBasedEmployeeCompensationPlansNumber (label)	xbrli:integerItemType	instant			fb	ShareBasedEmployeeCompensationPlansNumber Share-based Employee Compensation Plans, Number
781	fb:SharesReservedForIssuanceIncreasePercentage (label)	num:percentItemType	duration			fb	SharesReservedForIssuanceIncreasePercentage Shares Reserved For Issuance Increase Percentage
782	fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement (label)	xbrli:sharesItemType	duration			fb	StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement Stock Issued During Period, Shares, Restricted Stock Unit, Before Tax Settlement
783	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement (label)	xbrli:monetaryItemType	duration	credit		fb	StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement Stock Issued During Period, Value, Restricted Stock Unit, Before Tax Settlement
784	fb:StockOptionPlanTwentyTwelveMember (label)	nonnum:domainItemType	duration		true	fb	StockOptionPlanTwentyTwelveMember Stock Option Plan 2012 [Member]
785	fb:TaxYears2011Through2013Member (label)	nonnum:domainItemType	duration		true	fb	TaxYears2011Through2013Member Tax Years 2011 Through 2013 [Member]
786	fb:TotalDeferredIncomeTaxExpenseBenefit (label)	xbrli:monetaryItemType	duration	debit		fb	TotalDeferredIncomeTaxExpenseBenefit Total Deferred Income Tax Expense Benefit
787	fb:USCanadaMember (label)	nonnum:domainItemType	duration		true	fb	USCanadaMember US & Canada [Member]
788	fb:WeightedAverageSharesOutstanding (label)	xbrli:sharesItemType	duration			fb	WeightedAverageSharesOutstanding Weighted Average Shares Outstanding

Model Structures

Model Structure
Network	0001000 - Document - Document and Entity Information (http://www.facebook.com/role/DocumentAndEntityInformation)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	fb:DocumentandEntityInformationAbstract (label)	Abstract	duration		fb:DocumentandEntityInformationAbstract
2	dei:EntitiesTable (terseLabel)	Table	duration		dei:EntitiesTable
3	us-gaap:StatementClassOfStockAxis (terseLabel)	Axis	duration		us-gaap:StatementClassOfStockAxis
4	us-gaap:ClassOfStockDomain (terseLabel)	Member	duration		us-gaap:ClassOfStockDomain
5	Class A Common Stock	Member	duration		us-gaap:CommonClassAMember
6	Class B Common Stock	Member	duration		us-gaap:CommonClassBMember
7	dei:EntityInformationLineItems (terseLabel)	LineItems	duration		dei:EntityInformationLineItems
8	dei:DocumentType (terseLabel)	Concept (xbrli:stringItemType)	duration		dei:DocumentType
9	dei:AmendmentFlag (terseLabel)	Concept (Boolean)	duration		dei:AmendmentFlag
10	dei:EntityEmergingGrowthCompany (terseLabel)	Concept (Boolean)	duration		dei:EntityEmergingGrowthCompany
11	dei:EntitySmallBusiness (terseLabel)	Concept (Boolean)	duration		dei:EntitySmallBusiness
12	dei:EntityShellCompany (terseLabel)	Concept (Boolean)	duration		dei:EntityShellCompany
13	dei:DocumentPeriodEndDate (terseLabel)	Concept (Date)	duration		dei:DocumentPeriodEndDate
14	dei:DocumentFiscalYearFocus (terseLabel)	Concept (gYear)	duration		dei:DocumentFiscalYearFocus
15	dei:DocumentFiscalPeriodFocus (terseLabel)	Concept (xbrli:tokenItemType)	duration		dei:DocumentFiscalPeriodFocus
16	dei:TradingSymbol (terseLabel)	Concept (String-Normalized)	duration		dei:TradingSymbol
17	dei:EntityRegistrantName (terseLabel)	Concept (String-Normalized)	duration		dei:EntityRegistrantName
18	dei:EntityCentralIndexKey (terseLabel)	Concept (xbrli:tokenItemType)	duration		dei:EntityCentralIndexKey
19	dei:CurrentFiscalYearEndDate (terseLabel)	Concept (gMonthDay)	duration		dei:CurrentFiscalYearEndDate
20	dei:EntityFilerCategory (terseLabel)	Concept (xbrli:stringItemType)	duration		dei:EntityFilerCategory
21	dei:EntityCommonStockSharesOutstanding (terseLabel)	Concept (Shares)	instant		dei:EntityCommonStockSharesOutstanding
22	dei:EntityPublicFloat (terseLabel)	Concept (Monetary)	instant	credit	dei:EntityPublicFloat
23	dei:EntityWellKnownSeasonedIssuer (terseLabel)	Concept (xbrli:tokenItemType)	duration		dei:EntityWellKnownSeasonedIssuer
24	dei:EntityVoluntaryFilers (terseLabel)	Concept (xbrli:tokenItemType)	duration		dei:EntityVoluntaryFilers
25	dei:EntityCurrentReportingStatus (terseLabel)	Concept (xbrli:tokenItemType)	duration		dei:EntityCurrentReportingStatus

Model Structure
Network	1001000 - Statement - CONSOLIDATED BALANCE SHEETS (http://www.facebook.com/role/ConsolidatedBalanceSheets)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Statement of Financial Position [Abstract]	Abstract	duration		us-gaap:StatementOfFinancialPositionAbstract
2	us-gaap:AssetsAbstract (terseLabel)	Abstract	duration		us-gaap:AssetsAbstract
3	us-gaap:AssetsCurrentAbstract (terseLabel)	Abstract	duration		us-gaap:AssetsCurrentAbstract
4	us-gaap:CashAndCashEquivalentsAtCarryingValue (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:CashAndCashEquivalentsAtCarryingValue
5	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
6	us-gaap:AccountsReceivableNetCurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AccountsReceivableNetCurrent
7	us-gaap:PrepaidExpenseAndOtherAssetsCurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:PrepaidExpenseAndOtherAssetsCurrent
8	us-gaap:AssetsCurrent (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:AssetsCurrent
9	us-gaap:PropertyPlantAndEquipmentNet (verboseLabel)	Concept (Monetary)	instant	debit	us-gaap:PropertyPlantAndEquipmentNet
10	us-gaap:IntangibleAssetsNetExcludingGoodwill (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:IntangibleAssetsNetExcludingGoodwill
11	us-gaap:Goodwill (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:Goodwill
12	us-gaap:OtherAssetsNoncurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:OtherAssetsNoncurrent
13	us-gaap:Assets (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:Assets
14	us-gaap:LiabilitiesAndStockholdersEquityAbstract (terseLabel)	Abstract	duration		us-gaap:LiabilitiesAndStockholdersEquityAbstract
15	us-gaap:LiabilitiesCurrentAbstract (terseLabel)	Abstract	duration		us-gaap:LiabilitiesCurrentAbstract
16	us-gaap:AccountsPayableCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AccountsPayableCurrent
17	us-gaap:AccountsPayableOtherCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AccountsPayableOtherCurrent
18	us-gaap:AccruedLiabilitiesCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AccruedLiabilitiesCurrent
19	us-gaap:ContractWithCustomerLiabilityCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:ContractWithCustomerLiabilityCurrent
20	us-gaap:LiabilitiesCurrent (totalLabel)	Concept (Monetary)	instant	credit	us-gaap:LiabilitiesCurrent
21	us-gaap:OtherLiabilitiesNoncurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OtherLiabilitiesNoncurrent
22	us-gaap:Liabilities (totalLabel)	Concept (Monetary)	instant	credit	us-gaap:Liabilities
23	us-gaap:CommitmentsAndContingencies (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:CommitmentsAndContingencies
24	us-gaap:StockholdersEquityAbstract (terseLabel)	Abstract	duration		us-gaap:StockholdersEquityAbstract
25	us-gaap:CommonStockValue (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:CommonStockValue
26	us-gaap:AdditionalPaidInCapital (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AdditionalPaidInCapital
27	us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
28	us-gaap:RetainedEarningsAccumulatedDeficit (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:RetainedEarningsAccumulatedDeficit
29	Total stockholders' equity	Concept (Monetary)	instant	credit	us-gaap:StockholdersEquity
30	us-gaap:LiabilitiesAndStockholdersEquity (totalLabel)	Concept (Monetary)	instant	credit	us-gaap:LiabilitiesAndStockholdersEquity

Model Structure
Network	1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) (http://www.facebook.com/role/ConsolidatedBalanceSheetsParenthetical)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Statement of Financial Position [Abstract]	Abstract	duration		us-gaap:StatementOfFinancialPositionAbstract
2	us-gaap:StatementTable (terseLabel)	Table	duration		us-gaap:StatementTable
3	us-gaap:StatementClassOfStockAxis (terseLabel)	Axis	duration		us-gaap:StatementClassOfStockAxis
4	us-gaap:ClassOfStockDomain (terseLabel)	Member	duration		us-gaap:ClassOfStockDomain
5	Class A Common Stock	Member	duration		us-gaap:CommonClassAMember
6	Class B Common Stock	Member	duration		us-gaap:CommonClassBMember
7	us-gaap:StatementLineItems (terseLabel)	LineItems	duration		us-gaap:StatementLineItems
8	us-gaap:AssetsCurrentAbstract (terseLabel)	Abstract	duration		us-gaap:AssetsCurrentAbstract
9	us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
10	us-gaap:StockholdersEquityAbstract (terseLabel)	Abstract	duration		us-gaap:StockholdersEquityAbstract
11	us-gaap:CommonStockParOrStatedValuePerShare (terseLabel)	Concept (Per-Share)	instant		us-gaap:CommonStockParOrStatedValuePerShare
12	us-gaap:CommonStockSharesAuthorized (terseLabel)	Concept (Shares)	instant		us-gaap:CommonStockSharesAuthorized
13	us-gaap:CommonStockSharesIssued (verboseLabel)	Concept (Shares)	instant		us-gaap:CommonStockSharesIssued
14	Common stock, shares, outstanding (in shares)	Concept (Shares)	instant		us-gaap:CommonStockSharesOutstanding

Model Structure
Network	1002000 - Statement - CONSOLIDATED STATEMENTS OF INCOME (http://www.facebook.com/role/ConsolidatedStatementsOfIncome)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Statement [Abstract]	Abstract	duration		us-gaap:IncomeStatementAbstract
2	us-gaap:StatementTable (terseLabel)	Table	duration		us-gaap:StatementTable
3	us-gaap:IncomeStatementLocationAxis (terseLabel)	Axis	duration		us-gaap:IncomeStatementLocationAxis
4	us-gaap:IncomeStatementLocationDomain (terseLabel)	Member	duration		us-gaap:IncomeStatementLocationDomain
5	us-gaap:CostOfSalesMember (terseLabel)	Member	duration		us-gaap:CostOfSalesMember
6	us-gaap:ResearchAndDevelopmentExpenseMember (terseLabel)	Member	duration		us-gaap:ResearchAndDevelopmentExpenseMember
7	us-gaap:SellingAndMarketingExpenseMember (terseLabel)	Member	duration		us-gaap:SellingAndMarketingExpenseMember
8	us-gaap:GeneralAndAdministrativeExpenseMember (terseLabel)	Member	duration		us-gaap:GeneralAndAdministrativeExpenseMember
9	us-gaap:StatementLineItems (terseLabel)	LineItems	duration		us-gaap:StatementLineItems
10	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
11	us-gaap:CostsAndExpensesAbstract (terseLabel)	Abstract	duration		us-gaap:CostsAndExpensesAbstract
12	us-gaap:CostOfRevenue (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:CostOfRevenue
13	us-gaap:ResearchAndDevelopmentExpense (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ResearchAndDevelopmentExpense
14	us-gaap:SellingAndMarketingExpense (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:SellingAndMarketingExpense
15	us-gaap:GeneralAndAdministrativeExpense (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:GeneralAndAdministrativeExpense
16	us-gaap:CostsAndExpenses (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:CostsAndExpenses
17	us-gaap:OperatingIncomeLoss (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:OperatingIncomeLoss
18	Interest and other income (expense), net	Concept (Monetary)	duration	credit	us-gaap:NonoperatingIncomeExpense
19	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
20	Provision for income taxes	Concept (Monetary)	duration	debit	us-gaap:IncomeTaxExpenseBenefit
21	Net income	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLoss
22	Less: Net income attributable to participating securities	Concept (Monetary)	duration	debit	us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
23	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
24	Earnings per share attributable to Class A and Class B common stockholders:	Abstract	duration		us-gaap:EarningsPerShareAbstract
25	Basic (in dollars per share)	Concept (Per-Share)	duration		us-gaap:EarningsPerShareBasic
26	Diluted (in dollars per share)	Concept (Per-Share)	duration		us-gaap:EarningsPerShareDiluted
27	us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract (terseLabel)	Abstract	duration		us-gaap:WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract
28	Basic (in shares)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
29	Diluted (in shares)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
30	us-gaap:IncomeStatementCompensationItemsAbstract (terseLabel)	Abstract	duration		us-gaap:IncomeStatementCompensationItemsAbstract
31	us-gaap:AllocatedShareBasedCompensationExpense (positiveLabel)	Concept (Monetary)	duration	debit	us-gaap:AllocatedShareBasedCompensationExpense

Model Structure
Network	1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (http://www.facebook.com/role/ConsolidatedStatementsOfComprehensiveIncome)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Statement of Comprehensive Income [Abstract]	Abstract	duration		us-gaap:StatementOfIncomeAndComprehensiveIncomeAbstract
2	Net income	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLoss
3	us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract (terseLabel)	Abstract	duration		us-gaap:OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract
4	us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
5	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax (terseLabel)	Concept (Monetary)	duration	credit	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax
6	us-gaap:ComprehensiveIncomeNetOfTax (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:ComprehensiveIncomeNetOfTax

Model Structure
Network	1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (http://www.facebook.com/role/ConsolidatedStatementsOfStockholdersEquity)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Statement of Stockholders' Equity [Abstract]	Abstract	duration		us-gaap:StatementOfStockholdersEquityAbstract
2	us-gaap:StatementTable (terseLabel)	Table	duration		us-gaap:StatementTable
3	us-gaap:StatementEquityComponentsAxis (terseLabel)	Axis	duration		us-gaap:StatementEquityComponentsAxis
4	us-gaap:EquityComponentDomain (terseLabel)	Member	duration		us-gaap:EquityComponentDomain
5	us-gaap:CommonStockMember (terseLabel)	Member	duration		us-gaap:CommonStockMember
6	us-gaap:AdditionalPaidInCapitalMember (terseLabel)	Member	duration		us-gaap:AdditionalPaidInCapitalMember
7	us-gaap:AccumulatedOtherComprehensiveIncomeMember (terseLabel)	Member	duration		us-gaap:AccumulatedOtherComprehensiveIncomeMember
8	us-gaap:RetainedEarningsMember (terseLabel)	Member	duration		us-gaap:RetainedEarningsMember
9	us-gaap:StatementLineItems (terseLabel)	LineItems	duration		us-gaap:StatementLineItems
10	us-gaap:IncreaseDecreaseInStockholdersEquityRollForward (terseLabel)	Abstract	duration		us-gaap:IncreaseDecreaseInStockholdersEquityRollForward
11	us-gaap:CommonStockSharesOutstanding (periodStartLabel)	Concept (Shares)	instant		us-gaap:CommonStockSharesOutstanding
12	us-gaap:StockholdersEquity (periodStartLabel)	Concept (Monetary)	instant	credit	us-gaap:StockholdersEquity
13	us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
14	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption (terseLabel)	Concept (Monetary)	instant	credit	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption
15	Issuance of common stock for cash upon exercise of stock options, shares	Concept (Shares)	duration		us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
16	us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
17	us-gaap:StockIssuedDuringPeriodSharesAcquisitions (terseLabel)	Concept (Shares)	duration		us-gaap:StockIssuedDuringPeriodSharesAcquisitions
18	us-gaap:StockIssuedDuringPeriodValueAcquisitions (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:StockIssuedDuringPeriodValueAcquisitions
19	fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement (terseLabel)	Concept (Shares)	duration		fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement
20	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement (terseLabel)	Concept (Monetary)	duration	credit	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement
21	us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation (negatedTerseLabel)	Concept (Shares)	duration		us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
22	us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation (negatedLabel)	Concept (Monetary)	duration	debit	us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
23	us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
24	us-gaap:StockRepurchasedDuringPeriodShares (negatedTerseLabel)	Concept (Shares)	duration		us-gaap:StockRepurchasedDuringPeriodShares
25	us-gaap:StockRepurchasedDuringPeriodValue (negatedTerseLabel)	Concept (Monetary)	duration	debit	us-gaap:StockRepurchasedDuringPeriodValue
26	us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
27	us-gaap:NetIncomeLoss (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLoss
28	Common stock, shares outstanding ending (in shares)	Concept (Shares)	instant		us-gaap:CommonStockSharesOutstanding
29	Total stockholders' equity, ending	Concept (Monetary)	instant	credit	us-gaap:StockholdersEquity

Model Structure
Network	1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (http://www.facebook.com/role/ConsolidatedStatementsOfCashFlows)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Statement of Cash Flows [Abstract]	Abstract	duration		us-gaap:StatementOfCashFlowsAbstract
2	us-gaap:StatementTable (terseLabel)	Table	duration		us-gaap:StatementTable
3	us-gaap:BalanceSheetLocationAxis (terseLabel)	Axis	duration		us-gaap:BalanceSheetLocationAxis
4	us-gaap:BalanceSheetLocationDomain (terseLabel)	Member	duration		us-gaap:BalanceSheetLocationDomain
5	us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember (terseLabel)	Member	duration		us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember
6	us-gaap:OtherAssetsMember (terseLabel)	Member	duration		us-gaap:OtherAssetsMember
7	us-gaap:StatementLineItems (terseLabel)	LineItems	duration		us-gaap:StatementLineItems
8	us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract (terseLabel)	Abstract	duration		us-gaap:NetCashProvidedByUsedInOperatingActivitiesAbstract
9	us-gaap:NetIncomeLoss (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLoss
10	us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract (terseLabel)	Abstract	duration		us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
11	us-gaap:DepreciationDepletionAndAmortization (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:DepreciationDepletionAndAmortization
12	us-gaap:ShareBasedCompensation (verboseLabel)	Concept (Monetary)	duration	debit	us-gaap:ShareBasedCompensation
13	us-gaap:DeferredIncomeTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:DeferredIncomeTaxExpenseBenefit
14	us-gaap:OtherNoncashIncomeExpense (negatedTerseLabel)	Concept (Monetary)	duration	credit	us-gaap:OtherNoncashIncomeExpense
15	us-gaap:IncreaseDecreaseInOperatingCapitalAbstract (terseLabel)	Abstract	duration		us-gaap:IncreaseDecreaseInOperatingCapitalAbstract
16	us-gaap:IncreaseDecreaseInAccountsReceivable (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:IncreaseDecreaseInAccountsReceivable
17	us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
18	us-gaap:IncreaseDecreaseInOtherOperatingAssets (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:IncreaseDecreaseInOtherOperatingAssets
19	us-gaap:IncreaseDecreaseInAccountsPayable (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncreaseDecreaseInAccountsPayable
20	us-gaap:IncreaseDecreaseInOtherAccountsPayable (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncreaseDecreaseInOtherAccountsPayable
21	us-gaap:IncreaseDecreaseInAccruedLiabilities (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncreaseDecreaseInAccruedLiabilities
22	us-gaap:IncreaseDecreaseInContractWithCustomerLiability (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncreaseDecreaseInContractWithCustomerLiability
23	us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities
24	us-gaap:NetCashProvidedByUsedInOperatingActivities (totalLabel)	Concept (Monetary)	duration		us-gaap:NetCashProvidedByUsedInOperatingActivities
25	us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract (terseLabel)	Abstract	duration		us-gaap:NetCashProvidedByUsedInInvestingActivitiesAbstract
26	us-gaap:PaymentsToAcquirePropertyPlantAndEquipment (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
27	us-gaap:PaymentsToAcquireMarketableSecurities (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:PaymentsToAcquireMarketableSecurities
28	us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
29	us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
30	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets (negatedLabel)	Concept (Monetary)	duration	credit	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets
31	us-gaap:PaymentsForProceedsFromOtherInvestingActivities (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:PaymentsForProceedsFromOtherInvestingActivities
32	us-gaap:NetCashProvidedByUsedInInvestingActivities (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:NetCashProvidedByUsedInInvestingActivities
33	us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract (terseLabel)	Abstract	duration		us-gaap:NetCashProvidedByUsedInFinancingActivitiesAbstract
34	us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation (negatedLabel)	Concept (Monetary)	duration	credit	us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation
35	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations (negatedTerseLabel)	Concept (Monetary)	duration	credit	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations
36	us-gaap:PaymentsForRepurchaseOfCommonStock (negatedTerseLabel)	Concept (Monetary)	duration	credit	us-gaap:PaymentsForRepurchaseOfCommonStock
37	us-gaap:ProceedsFromRepaymentsOfBankOverdrafts (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ProceedsFromRepaymentsOfBankOverdrafts
38	us-gaap:ProceedsFromPaymentsForOtherFinancingActivities (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
39	us-gaap:NetCashProvidedByUsedInFinancingActivities (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:NetCashProvidedByUsedInFinancingActivities
40	us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
41	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
42	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents (periodStartLabel)	Concept (Monetary)	instant	debit	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
43	Cash, cash equivalents, and restricted cash at end of the period	Concept (Monetary)	instant	debit	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
44	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract (terseLabel)	Abstract	duration		us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract
45	us-gaap:CashAndCashEquivalentsAtCarryingValue (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:CashAndCashEquivalentsAtCarryingValue
46	us-gaap:RestrictedCashAndCashEquivalents (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:RestrictedCashAndCashEquivalents
47	Total cash, cash equivalents, and restricted cash	Concept (Monetary)	instant	debit	us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
48	us-gaap:SupplementalCashFlowInformationAbstract (terseLabel)	Abstract	duration		us-gaap:SupplementalCashFlowInformationAbstract
49	fb:CashPaidDuringPeriodForAbstract (terseLabel)	Abstract	duration		fb:CashPaidDuringPeriodForAbstract
50	us-gaap:InterestPaidNet (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:InterestPaidNet
51	us-gaap:IncomeTaxesPaidNet (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:IncomeTaxesPaidNet
52	us-gaap:CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract (terseLabel)	Abstract	duration		us-gaap:CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
53	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions (terseLabel)	Concept (Monetary)	duration	credit	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions
54	fb:SettlementOfContingentConsiderationLiability (terseLabel)	Concept (Monetary)	duration	credit	fb:SettlementOfContingentConsiderationLiability
55	fb:ChangeinUnsettledRepurchasesofCommonStock (terseLabel)	Concept (Monetary)	duration	credit	fb:ChangeinUnsettledRepurchasesofCommonStock

Model Structure
Network	2101100 - Disclosure - Summary of Significant Accounting Policies (http://www.facebook.com/role/SummaryOfSignificantAccountingPolicies)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounting Policies [Abstract]	Abstract	duration		us-gaap:AccountingPoliciesAbstract
2	us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock

Model Structure
Network	2103100 - Disclosure - Earnings per Share (http://www.facebook.com/role/EarningsPerShare)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Earnings Per Share [Abstract]	Abstract	duration		us-gaap:EarningsPerShareAbstract
2	us-gaap:EarningsPerShareTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:EarningsPerShareTextBlock

Model Structure
Network	2104100 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecurities)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract (label)	Abstract	duration		fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract
2	us-gaap:CashCashEquivalentsAndShortTermInvestmentsTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:CashCashEquivalentsAndShortTermInvestmentsTextBlock

Model Structure
Network	2106100 - Disclosure - Fair Value Measurement (http://www.facebook.com/role/FairValueMeasurement)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Fair Value Disclosures [Abstract]	Abstract	duration		us-gaap:FairValueDisclosuresAbstract
2	us-gaap:FairValueDisclosuresTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:FairValueDisclosuresTextBlock

Model Structure
Network	2107100 - Disclosure - Property and Equipment (http://www.facebook.com/role/PropertyAndEquipment)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Property, Plant and Equipment [Abstract]	Abstract	duration		us-gaap:PropertyPlantAndEquipmentAbstract
2	us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock

Model Structure
Network	2108100 - Disclosure - Goodwill and Intangible Assets (http://www.facebook.com/role/GoodwillAndIntangibleAssets)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Goodwill and Intangible Assets Disclosure [Abstract]	Abstract	duration		us-gaap:GoodwillAndIntangibleAssetsDisclosureAbstract
2	us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock

Model Structure
Network	2109100 - Disclosure - Liabilities (http://www.facebook.com/role/Liabilities)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounts Payable and Accrued Liabilities [Abstract]	Abstract	duration		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
2	fb:AccountsPayableAccruedLiabilitiesandOtherLiabilitiesDisclosureCurrentandNoncurrentTextBlock (terseLabel)	Concept (TextBlock)	duration		fb:AccountsPayableAccruedLiabilitiesandOtherLiabilitiesDisclosureCurrentandNoncurrentTextBlock

Model Structure
Network	2110100 - Disclosure - Long-term Debt (http://www.facebook.com/role/LongTermDebt)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Debt Disclosure [Abstract]	Abstract	duration		us-gaap:DebtDisclosureAbstract
2	us-gaap:LongTermDebtTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:LongTermDebtTextBlock

Model Structure
Network	2111100 - Disclosure - Commitments and Contingencies (http://www.facebook.com/role/CommitmentsAndContingencies)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Commitments and Contingencies Disclosure [Abstract]	Abstract	duration		us-gaap:CommitmentsAndContingenciesDisclosureAbstract
2	us-gaap:CommitmentsAndContingenciesDisclosureTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:CommitmentsAndContingenciesDisclosureTextBlock

Model Structure
Network	2112100 - Disclosure - Stockholders' Equity (http://www.facebook.com/role/StockholdersEquity)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Equity [Abstract]	Abstract	duration		us-gaap:EquityAbstract
2	us-gaap:ShareholdersEquityAndShareBasedPaymentsTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ShareholdersEquityAndShareBasedPaymentsTextBlock

Model Structure
Network	2113100 - Disclosure - Interest and other income (expense), net (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNet)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Nonoperating Income (Expense) [Abstract]	Abstract	duration		us-gaap:NonoperatingIncomeExpenseAbstract
2	us-gaap:OtherNonoperatingIncomeAndExpenseTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:OtherNonoperatingIncomeAndExpenseTextBlock

Model Structure
Network	2114100 - Disclosure - Income Taxes (http://www.facebook.com/role/IncomeTaxes)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:IncomeTaxDisclosureTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:IncomeTaxDisclosureTextBlock

Model Structure
Network	2115100 - Disclosure - Geographical Information (http://www.facebook.com/role/GeographicalInformation)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Segments, Geographical Areas [Abstract]	Abstract	duration		us-gaap:SegmentsGeographicalAreasAbstract
2	us-gaap:SegmentReportingDisclosureTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:SegmentReportingDisclosureTextBlock

Model Structure
Network	2201201 - Disclosure - Summary of Significant Accounting Policies (Policies) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesPolicies)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Accounting Policies [Abstract]	Abstract	duration	us-gaap:AccountingPoliciesAbstract
2	us-gaap:BasisOfAccountingPolicyPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:BasisOfAccountingPolicyPolicyTextBlock
3	us-gaap:UseOfEstimates (terseLabel)	Concept (TextBlock)	duration	us-gaap:UseOfEstimates
4	us-gaap:RevenueFromContractWithCustomerPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:RevenueFromContractWithCustomerPolicyTextBlock
5	us-gaap:IncomeTaxPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:IncomeTaxPolicyTextBlock
6	us-gaap:AdvertisingCostPolicyExpensedAdvertisingCost (terseLabel)	Concept (TextBlock)	duration	us-gaap:AdvertisingCostPolicyExpensedAdvertisingCost
7	fb:CashAndCashEquivalentsAndMarketableSecuritiesPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	fb:CashAndCashEquivalentsAndMarketableSecuritiesPolicyTextBlock
8	us-gaap:FairValueOfFinancialInstrumentsPolicy (terseLabel)	Concept (TextBlock)	duration	us-gaap:FairValueOfFinancialInstrumentsPolicy
9	us-gaap:TradeAndOtherAccountsReceivablePolicy (terseLabel)	Concept (TextBlock)	duration	us-gaap:TradeAndOtherAccountsReceivablePolicy
10	us-gaap:PropertyPlantAndEquipmentPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:PropertyPlantAndEquipmentPolicyTextBlock
11	us-gaap:LesseeLeasesPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:LesseeLeasesPolicyTextBlock
12	us-gaap:CommitmentsAndContingenciesPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:CommitmentsAndContingenciesPolicyTextBlock
13	us-gaap:BusinessCombinationsPolicy (terseLabel)	Concept (TextBlock)	duration	us-gaap:BusinessCombinationsPolicy
14	fb:LongLivedAssetsIncludingGoodwillAndIntangiblePolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	fb:LongLivedAssetsIncludingGoodwillAndIntangiblePolicyTextBlock
15	us-gaap:ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock
16	us-gaap:ConcentrationRiskCreditRisk (terseLabel)	Concept (TextBlock)	duration	us-gaap:ConcentrationRiskCreditRisk
17	us-gaap:SegmentReportingPolicyPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:SegmentReportingPolicyPolicyTextBlock
18	us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock

Model Structure
Network	2301302 - Disclosure - Summary of Significant Accounting Policies (Tables) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Accounting Policies [Abstract]	Abstract	duration	us-gaap:AccountingPoliciesAbstract
2	us-gaap:DisaggregationOfRevenueTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:DisaggregationOfRevenueTableTextBlock
3	us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ContractWithCustomerAssetAndLiabilityTableTextBlock
4	fb:PropertyPlantAndEqiupmentUsefulLifeTableTextBlock (verboseLabel)	Concept (TextBlock)	duration	fb:PropertyPlantAndEqiupmentUsefulLifeTableTextBlock

Model Structure
Network	2303301 - Disclosure - Earnings per Share (Tables) (http://www.facebook.com/role/EarningsPerShareTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Earnings Per Share [Abstract]	Abstract	duration		us-gaap:EarningsPerShareAbstract
2	us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock

Model Structure
Network	2304301 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Tables) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract (label)	Abstract	duration	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract
2	us-gaap:ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
3	us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock

Model Structure
Network	2306301 - Disclosure - Fair Value Measurement (Tables) (http://www.facebook.com/role/FairValueMeasurementTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Fair Value Disclosures [Abstract]	Abstract	duration		us-gaap:FairValueDisclosuresAbstract
2	us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock

Model Structure
Network	2307301 - Disclosure - Property and Equipment (Tables) (http://www.facebook.com/role/PropertyAndEquipmentTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Property, Plant and Equipment [Abstract]	Abstract	duration		us-gaap:PropertyPlantAndEquipmentAbstract
2	us-gaap:PropertyPlantAndEquipmentTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:PropertyPlantAndEquipmentTextBlock

Model Structure
Network	2308301 - Disclosure - Goodwill and Intangible Assets (Tables) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Goodwill and Intangible Assets Disclosure [Abstract]	Abstract	duration	us-gaap:GoodwillAndIntangibleAssetsDisclosureAbstract
2	us-gaap:ScheduleOfGoodwillTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfGoodwillTextBlock
3	us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock
4	us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock

Model Structure
Network	2309301 - Disclosure - Liabilities (Tables) (http://www.facebook.com/role/LiabilitiesTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Accounts Payable and Accrued Liabilities [Abstract]	Abstract	duration	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
2	us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock
3	us-gaap:OtherLiabilitiesTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:OtherLiabilitiesTableTextBlock

Model Structure
Network	2311301 - Disclosure - Commitments and Contingencies (Tables) (http://www.facebook.com/role/CommitmentsAndContingenciesTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Commitments and Contingencies Disclosure [Abstract]	Abstract	duration		us-gaap:CommitmentsAndContingenciesDisclosureAbstract
2	us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock

Model Structure
Network	2312301 - Disclosure - Stockholders' Equity (Tables) (http://www.facebook.com/role/StockholdersEquityTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Equity [Abstract]	Abstract	duration	us-gaap:EquityAbstract
2	us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
3	us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock

Model Structure
Network	2313301 - Disclosure - Interest and other income (expense), net (Tables) (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNetTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Nonoperating Income (Expense) [Abstract]	Abstract	duration		us-gaap:NonoperatingIncomeExpenseAbstract
2	us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock

Model Structure
Network	2314301 - Disclosure - Income Taxes (Tables) (http://www.facebook.com/role/IncomeTaxesTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration	us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock
3	us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
4	us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
5	us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
6	us-gaap:ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock (terseLabel)	Concept (TextBlock)	duration	us-gaap:ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock

Model Structure
Network	2315301 - Disclosure - Geographical Information (Tables) (http://www.facebook.com/role/GeographicalInformationTables)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Segments, Geographical Areas [Abstract]	Abstract	duration		us-gaap:SegmentsGeographicalAreasAbstract
2	us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock (terseLabel)	Concept (TextBlock)	duration		us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock

Model Structure
Network	2401403 - Disclosure - Summary of Significant Accounting Policies - Disaggregated Revenue (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesDisaggregatedRevenueDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounting Policies [Abstract]	Abstract	duration		us-gaap:AccountingPoliciesAbstract
2	us-gaap:DisaggregationOfRevenueTable (terseLabel)	Table	duration		us-gaap:DisaggregationOfRevenueTable
3	us-gaap:ConcentrationRiskByBenchmarkAxis (terseLabel)	Axis	duration		us-gaap:ConcentrationRiskByBenchmarkAxis
4	us-gaap:ConcentrationRiskBenchmarkDomain (terseLabel)	Member	duration		us-gaap:ConcentrationRiskBenchmarkDomain
5	us-gaap:SalesRevenueServicesNetMember (verboseLabel)	Member	duration		us-gaap:SalesRevenueServicesNetMember
6	us-gaap:ConcentrationRiskByTypeAxis (terseLabel)	Axis	duration		us-gaap:ConcentrationRiskByTypeAxis
7	us-gaap:ConcentrationRiskTypeDomain (terseLabel)	Member	duration		us-gaap:ConcentrationRiskTypeDomain
8	us-gaap:GeographicConcentrationRiskMember (terseLabel)	Member	duration		us-gaap:GeographicConcentrationRiskMember
9	srt:StatementGeographicalAxis (terseLabel)	Axis	duration		srt:StatementGeographicalAxis
10	srt:SegmentGeographicalDomain (terseLabel)	Member	duration		srt:SegmentGeographicalDomain
11	fb:USCanadaMember (terseLabel)	Member	duration		fb:USCanadaMember
12	srt:EuropeMember (terseLabel)	Member	duration		srt:EuropeMember
13	srt:AsiaPacificMember (terseLabel)	Member	duration		srt:AsiaPacificMember
14	fb:RestOfWorldMember (verboseLabel)	Member	duration		fb:RestOfWorldMember
15	country:US (terseLabel)	Member	duration		country:US
16	srt:ProductOrServiceAxis (terseLabel)	Axis	duration		srt:ProductOrServiceAxis
17	srt:ProductsAndServicesDomain (terseLabel)	Member	duration		srt:ProductsAndServicesDomain
18	us-gaap:AdvertisingMember (terseLabel)	Member	duration		us-gaap:AdvertisingMember
19	fb:PaymentsandOtherFeesMember (terseLabel)	Member	duration		fb:PaymentsandOtherFeesMember
20	us-gaap:DisaggregationOfRevenueLineItems (terseLabel)	LineItems	duration		us-gaap:DisaggregationOfRevenueLineItems
21	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
22	us-gaap:ConcentrationRiskPercentage1 (terseLabel)	Concept (Percent)	duration		us-gaap:ConcentrationRiskPercentage1

Model Structure
Network	2401404 - Disclosure - Summary of Significant Accounting Policies - Deferred Revenue and Deposits (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesDeferredRevenueAndDepositsDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounting Policies [Abstract]	Abstract	duration		us-gaap:AccountingPoliciesAbstract
2	us-gaap:ContractWithCustomerLiability (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:ContractWithCustomerLiability
3	fb:ContractWithCustomerDepositsUnusedBalances (terseLabel)	Concept (Monetary)	instant	credit	fb:ContractWithCustomerDepositsUnusedBalances
4	fb:ContractWithCustomerLiabilityandUnusedDeposits (totalLabel)	Concept (Monetary)	instant	credit	fb:ContractWithCustomerLiabilityandUnusedDeposits

Model Structure
Network	2401405 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounting Policies [Abstract]	Abstract	duration		us-gaap:AccountingPoliciesAbstract
2	us-gaap:ScheduleOfPropertyPlantAndEquipmentTable (terseLabel)	Table	duration		us-gaap:ScheduleOfPropertyPlantAndEquipmentTable
3	us-gaap:StatementScenarioAxis (terseLabel)	Axis	duration		us-gaap:StatementScenarioAxis
4	us-gaap:ScenarioUnspecifiedDomain (terseLabel)	Member	duration		us-gaap:ScenarioUnspecifiedDomain
5	us-gaap:ScenarioForecastMember (terseLabel)	Member	duration		us-gaap:ScenarioForecastMember
6	us-gaap:AdjustmentsForNewAccountingPronouncementsAxis (terseLabel)	Axis	duration		us-gaap:AdjustmentsForNewAccountingPronouncementsAxis
7	us-gaap:TypeOfAdoptionMember (terseLabel)	Member	duration		us-gaap:TypeOfAdoptionMember
8	us-gaap:AccountingStandardsUpdate201602Member (terseLabel)	Member	duration		us-gaap:AccountingStandardsUpdate201602Member
9	us-gaap:ConcentrationRiskByBenchmarkAxis (terseLabel)	Axis	duration		us-gaap:ConcentrationRiskByBenchmarkAxis
10	us-gaap:ConcentrationRiskBenchmarkDomain (terseLabel)	Member	duration		us-gaap:ConcentrationRiskBenchmarkDomain
11	Sales revenue	Member	duration		us-gaap:SalesRevenueServicesNetMember
12	us-gaap:ConcentrationRiskByTypeAxis (terseLabel)	Axis	duration		us-gaap:ConcentrationRiskByTypeAxis
13	us-gaap:ConcentrationRiskTypeDomain (terseLabel)	Member	duration		us-gaap:ConcentrationRiskTypeDomain
14	us-gaap:GeographicConcentrationRiskMember (terseLabel)	Member	duration		us-gaap:GeographicConcentrationRiskMember
15	srt:StatementGeographicalAxis (terseLabel)	Axis	duration		srt:StatementGeographicalAxis
16	srt:SegmentGeographicalDomain (terseLabel)	Member	duration		srt:SegmentGeographicalDomain
17	country:US (terseLabel)	Member	duration		country:US
18	us-gaap:PropertyPlantAndEquipmentByTypeAxis (terseLabel)	Axis	duration		us-gaap:PropertyPlantAndEquipmentByTypeAxis
19	us-gaap:PropertyPlantAndEquipmentTypeDomain (terseLabel)	Member	duration		us-gaap:PropertyPlantAndEquipmentTypeDomain
20	us-gaap:TechnologyEquipmentMember (terseLabel)	Member	duration		us-gaap:TechnologyEquipmentMember
21	us-gaap:BuildingMember (terseLabel)	Member	duration		us-gaap:BuildingMember
22	fb:ComputerSoftwareOfficeEquipmentAndOtherMember (terseLabel)	Member	duration		fb:ComputerSoftwareOfficeEquipmentAndOtherMember
23	srt:RangeAxis (terseLabel)	Axis	duration		srt:RangeAxis
24	srt:RangeMember (terseLabel)	Member	duration		srt:RangeMember
25	srt:MinimumMember (verboseLabel)	Member	duration		srt:MinimumMember
26	srt:MaximumMember (verboseLabel)	Member	duration		srt:MaximumMember
27	Summary of Accounting Policies	LineItems	duration		us-gaap:PropertyPlantAndEquipmentLineItems
28	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (terseLabel)	Concept (Percent)	duration		fb:RevenueRemainingPerformanceObligationAmountPayablePercentage
29	us-gaap:AdvertisingExpense (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:AdvertisingExpense
30	us-gaap:PropertyPlantAndEquipmentUsefulLife (terseLabel)	Concept (Duration)	duration		us-gaap:PropertyPlantAndEquipmentUsefulLife
31	us-gaap:GoodwillImpairmentLoss (verboseLabel)	Concept (Monetary)	duration	debit	us-gaap:GoodwillImpairmentLoss
32	us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (negatedLabel)	Concept (Monetary)	instant	credit	us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
33	Foreign currency exchange losses, net	Concept (Monetary)	duration	credit	us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
34	us-gaap:ConcentrationRiskPercentage1 (terseLabel)	Concept (Percent)	duration		us-gaap:ConcentrationRiskPercentage1
35	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
36	us-gaap:ProvisionForDoubtfulAccounts (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ProvisionForDoubtfulAccounts
37	us-gaap:NumberOfReportableSegments (terseLabel)	Concept (Integer)	duration		us-gaap:NumberOfReportableSegments
38	us-gaap:NumberOfOperatingSegments (terseLabel)	Concept (Integer)	duration		us-gaap:NumberOfOperatingSegments
39	us-gaap:OperatingLeaseRightOfUseAsset (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:OperatingLeaseRightOfUseAsset
40	us-gaap:OperatingLeaseLiability (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeaseLiability

Model Structure
Network	2403402 - Disclosure - Earnings per Share (Details) (http://www.facebook.com/role/EarningsPerShareDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Earnings Per Share [Abstract]	Abstract	duration		us-gaap:EarningsPerShareAbstract
2	us-gaap:ScheduleOfEarningsPerShareBasicByCommonClassTable (terseLabel)	Table	duration		us-gaap:ScheduleOfEarningsPerShareBasicByCommonClassTable
3	us-gaap:StatementClassOfStockAxis (terseLabel)	Axis	duration		us-gaap:StatementClassOfStockAxis
4	us-gaap:ClassOfStockDomain (terseLabel)	Member	duration		us-gaap:ClassOfStockDomain
5	Class A Common Stock	Member	duration		us-gaap:CommonClassAMember
6	us-gaap:CommonClassBMember (terseLabel)	Member	duration		us-gaap:CommonClassBMember
7	us-gaap:AwardTypeAxis (terseLabel)	Axis	duration		us-gaap:AwardTypeAxis
8	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain (terseLabel)	Member	duration		us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain
9	Employee Stock Option	Member	duration		us-gaap:EmployeeStockOptionMember
10	us-gaap:RestrictedStockUnitsRSUMember (terseLabel)	Member	duration		us-gaap:RestrictedStockUnitsRSUMember
11	us-gaap:EarningsPerShareBasicLineItems (terseLabel)	LineItems	duration		us-gaap:EarningsPerShareBasicLineItems
12	us-gaap:EarningsPerShareBasicAbstract (terseLabel)	Abstract	duration		us-gaap:EarningsPerShareBasicAbstract
13	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasicAbstract (terseLabel)	Abstract	duration		us-gaap:NetIncomeLossAvailableToCommonStockholdersBasicAbstract
14	us-gaap:NetIncomeLoss (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLoss
15	us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic (verboseLabel)	Concept (Monetary)	duration	debit	us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
16	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
17	us-gaap:WeightedAverageNumberOfSharesOutstandingBasicAbstract (terseLabel)	Abstract	duration		us-gaap:WeightedAverageNumberOfSharesOutstandingBasicAbstract
18	fb:WeightedAverageSharesOutstanding (terseLabel)	Concept (Shares)	duration		fb:WeightedAverageSharesOutstanding
19	us-gaap:WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation (terseLabel)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
20	us-gaap:WeightedAverageNumberOfSharesOutstandingBasic (totalLabel)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
21	us-gaap:EarningsPerShareBasic (verboseLabel)	Concept (Per-Share)	duration		us-gaap:EarningsPerShareBasic
22	us-gaap:EarningsPerShareDilutedAbstract (terseLabel)	Abstract	duration		us-gaap:EarningsPerShareDilutedAbstract
23	us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract (terseLabel)	Abstract	duration		us-gaap:NetIncomeLossAvailableToCommonStockholdersDilutedAbstract
24	Net income attributable to common stockholders	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
25	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (terseLabel)	Concept (Monetary)	duration	credit	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities
26	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (terseLabel)	Concept (Monetary)	duration	credit	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares
27	fb:ReallocationOfNetIncomeToClassBCommonStock (terseLabel)	Concept (Monetary)	duration	credit	fb:ReallocationOfNetIncomeToClassBCommonStock
28	us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted
29	us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract (terseLabel)	Abstract	duration		us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract
30	Number of shares used for basic EPS computation (in shares)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
31	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (terseLabel)	Concept (Shares)	duration		fb:IncrementalCommonSharesAttributableToConversionOfCommonStock
32	us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements (terseLabel)	Concept (Shares)	duration		us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
33	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (terseLabel)	Concept (Shares)	duration		fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase
34	us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding (totalLabel)	Concept (Shares)	duration		us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
35	us-gaap:EarningsPerShareDiluted (verboseLabel)	Concept (Per-Share)	duration		us-gaap:EarningsPerShareDiluted

Model Structure
Network	2404402 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Details) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract (label)	Abstract	duration		fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract
2	fb:ScheduleOfCashCashEquivalentsAndMarketableSecuritiesTable (terseLabel)	Table	duration		fb:ScheduleOfCashCashEquivalentsAndMarketableSecuritiesTable
3	us-gaap:FinancialInstrumentAxis (terseLabel)	Axis	duration		us-gaap:FinancialInstrumentAxis
4	us-gaap:TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain (terseLabel)	Member	duration		us-gaap:TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain
5	us-gaap:USGovernmentDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:USGovernmentDebtSecuritiesMember
6	us-gaap:USGovernmentAgenciesDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:USGovernmentAgenciesDebtSecuritiesMember
7	us-gaap:CorporateDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:CorporateDebtSecuritiesMember
8	us-gaap:CashAndCashEquivalentsAxis (terseLabel)	Axis	duration		us-gaap:CashAndCashEquivalentsAxis
9	us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember (terseLabel)	Member	duration		us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
10	us-gaap:CashMember (terseLabel)	Member	duration		us-gaap:CashMember
11	us-gaap:MoneyMarketFundsMember (terseLabel)	Member	duration		us-gaap:MoneyMarketFundsMember
12	us-gaap:USGovernmentDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:USGovernmentDebtSecuritiesMember
13	us-gaap:USGovernmentAgenciesDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:USGovernmentAgenciesDebtSecuritiesMember
14	us-gaap:BankTimeDepositsMember (terseLabel)	Member	duration		us-gaap:BankTimeDepositsMember
15	us-gaap:CorporateDebtSecuritiesMember (verboseLabel)	Member	duration		us-gaap:CorporateDebtSecuritiesMember
16	fb:CashCashEquivalentsAndMarketableSecuritiesLineItems (terseLabel)	LineItems	duration		fb:CashCashEquivalentsAndMarketableSecuritiesLineItems
17	us-gaap:CashAndCashEquivalentsAtCarryingValue (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:CashAndCashEquivalentsAtCarryingValue
18	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
19	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (totalLabel)	Concept (Monetary)	instant	debit	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue
20	us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (negatedTerseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
21	us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss (negatedLabel)	Concept (Monetary)	instant	debit	us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss

Model Structure
Network	2404403 - Disclosure - Cash and Cash Equivalents, and Marketable Securities - Contractual Maturities of Debt Securities (Details) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesContractualMaturitiesOfDebtSecuritiesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract (label)	Abstract	duration		fb:CashAndCashEquivalentsAndMarketableSecuritiesAbstract
2	us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
3	us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
4	Total	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

Model Structure
Network	2406402 - Disclosure - Fair Value Measurement (Details) (http://www.facebook.com/role/FairValueMeasurementDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Fair Value Disclosures [Abstract]	Abstract	duration		us-gaap:FairValueDisclosuresAbstract
2	us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable (terseLabel)	Table	duration		us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable
3	us-gaap:FinancialInstrumentAxis (terseLabel)	Axis	duration		us-gaap:FinancialInstrumentAxis
4	us-gaap:TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain (terseLabel)	Member	duration		us-gaap:TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain
5	U.S. government securities	Member	duration		us-gaap:USGovernmentDebtSecuritiesMember
6	U.S. government agency securities	Member	duration		us-gaap:USGovernmentAgenciesDebtSecuritiesMember
7	Corporate debt securities	Member	duration		us-gaap:CorporateDebtSecuritiesMember
8	us-gaap:CashAndCashEquivalentsAxis (terseLabel)	Axis	duration		us-gaap:CashAndCashEquivalentsAxis
9	us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember (terseLabel)	Member	duration		us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
10	us-gaap:MoneyMarketFundsMember (terseLabel)	Member	duration		us-gaap:MoneyMarketFundsMember
11	U.S. government securities	Member	duration		us-gaap:USGovernmentDebtSecuritiesMember
12	U.S. government agency securities	Member	duration		us-gaap:USGovernmentAgenciesDebtSecuritiesMember
13	Certificate of deposits and time deposits	Member	duration		us-gaap:BankTimeDepositsMember
14	Corporate debt securities	Member	duration		us-gaap:CorporateDebtSecuritiesMember
15	us-gaap:FairValueByFairValueHierarchyLevelAxis (terseLabel)	Axis	duration		us-gaap:FairValueByFairValueHierarchyLevelAxis
16	us-gaap:FairValueMeasurementsFairValueHierarchyDomain (terseLabel)	Member	duration		us-gaap:FairValueMeasurementsFairValueHierarchyDomain
17	us-gaap:FairValueInputsLevel1Member (terseLabel)	Member	duration		us-gaap:FairValueInputsLevel1Member
18	us-gaap:FairValueInputsLevel2Member (terseLabel)	Member	duration		us-gaap:FairValueInputsLevel2Member
19	us-gaap:FairValueInputsLevel3Member (terseLabel)	Member	duration		us-gaap:FairValueInputsLevel3Member
20	us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems (terseLabel)	LineItems	duration		us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
21	us-gaap:CashAndCashEquivalentsFairValueDisclosure (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:CashAndCashEquivalentsFairValueDisclosure
22	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent
23	us-gaap:AssetsFairValueDisclosure (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:AssetsFairValueDisclosure

Model Structure
Network	2407402 - Disclosure - Property and Equipment (Detail) (http://www.facebook.com/role/PropertyAndEquipmentDetail)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Property, Plant and Equipment [Abstract]	Abstract	duration		us-gaap:PropertyPlantAndEquipmentAbstract
2	us-gaap:ScheduleOfPropertyPlantAndEquipmentTable (terseLabel)	Table	duration		us-gaap:ScheduleOfPropertyPlantAndEquipmentTable
3	us-gaap:PropertyPlantAndEquipmentByTypeAxis (terseLabel)	Axis	duration		us-gaap:PropertyPlantAndEquipmentByTypeAxis
4	us-gaap:PropertyPlantAndEquipmentTypeDomain (terseLabel)	Member	duration		us-gaap:PropertyPlantAndEquipmentTypeDomain
5	us-gaap:LandMember (terseLabel)	Member	duration		us-gaap:LandMember
6	us-gaap:BuildingMember (terseLabel)	Member	duration		us-gaap:BuildingMember
7	us-gaap:LeaseholdImprovementsMember (terseLabel)	Member	duration		us-gaap:LeaseholdImprovementsMember
8	us-gaap:ComputerEquipmentMember (terseLabel)	Member	duration		us-gaap:ComputerEquipmentMember
9	fb:ComputerSoftwareOfficeEquipmentAndOtherMember (terseLabel)	Member	duration		fb:ComputerSoftwareOfficeEquipmentAndOtherMember
10	us-gaap:ConstructionInProgressMember (terseLabel)	Member	duration		us-gaap:ConstructionInProgressMember
11	us-gaap:PropertyPlantAndEquipmentLineItems (verboseLabel)	LineItems	duration		us-gaap:PropertyPlantAndEquipmentLineItems
12	us-gaap:PropertyPlantAndEquipmentGross (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:PropertyPlantAndEquipmentGross
13	us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (negatedLabel)	Concept (Monetary)	instant	credit	us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
14	Property and equipment, net	Concept (Monetary)	instant	debit	us-gaap:PropertyPlantAndEquipmentNet
15	us-gaap:Depreciation (verboseLabel)	Concept (Monetary)	duration	debit	us-gaap:Depreciation
16	us-gaap:CapitalLeasedAssetsGross (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:CapitalLeasedAssetsGross
17	us-gaap:CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
18	us-gaap:InterestCostsCapitalized (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:InterestCostsCapitalized

Model Structure
Network	2408402 - Disclosure - Goodwill and Intangible Assets - Change in Carrying Amount (Details) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsChangeInCarryingAmountDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Goodwill and Intangible Assets Disclosure [Abstract]	Abstract	duration		us-gaap:GoodwillAndIntangibleAssetsDisclosureAbstract
2	us-gaap:GoodwillRollForward (terseLabel)	Abstract	duration		us-gaap:GoodwillRollForward
3	Goodwill beginning	Concept (Monetary)	instant	debit	us-gaap:Goodwill
4	us-gaap:GoodwillAcquiredDuringPeriod (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:GoodwillAcquiredDuringPeriod
5	us-gaap:GoodwillForeignCurrencyTranslationGainLoss (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:GoodwillForeignCurrencyTranslationGainLoss
6	Goodwill ending	Concept (Monetary)	instant	debit	us-gaap:Goodwill

Model Structure
Network	2408403 - Disclosure - Goodwill and Intangible Assets - Intangible Assets (Detail) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsDetail)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Goodwill and Intangible Assets Disclosure [Abstract]	Abstract	duration		us-gaap:GoodwillAndIntangibleAssetsDisclosureAbstract
2	us-gaap:AmortizationOfIntangibleAssets (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:AmortizationOfIntangibleAssets
3	us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTable (terseLabel)	Table	duration		us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTable
4	us-gaap:FiniteLivedIntangibleAssetsByMajorClassAxis (terseLabel)	Axis	duration		us-gaap:FiniteLivedIntangibleAssetsByMajorClassAxis
5	us-gaap:FiniteLivedIntangibleAssetsMajorClassNameDomain (terseLabel)	Member	duration		us-gaap:FiniteLivedIntangibleAssetsMajorClassNameDomain
6	fb:AcquiredusersMember (terseLabel)	Member	duration		fb:AcquiredusersMember
7	us-gaap:TechnologyBasedIntangibleAssetsMember (verboseLabel)	Member	duration		us-gaap:TechnologyBasedIntangibleAssetsMember
8	us-gaap:PatentsMember (terseLabel)	Member	duration		us-gaap:PatentsMember
9	us-gaap:TradeNamesMember (terseLabel)	Member	duration		us-gaap:TradeNamesMember
10	us-gaap:OtherIntangibleAssetsMember (verboseLabel)	Member	duration		us-gaap:OtherIntangibleAssetsMember
11	us-gaap:FiniteLivedIntangibleAssetsLineItems (terseLabel)	LineItems	duration		us-gaap:FiniteLivedIntangibleAssetsLineItems
12	us-gaap:AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife (verboseLabel)	Concept (Duration)	duration		us-gaap:AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
13	us-gaap:FiniteLivedIntangibleAssetsGross (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsGross
14	us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization (negatedTerseLabel)	Concept (Monetary)	instant	credit	us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
15	us-gaap:FiniteLivedIntangibleAssetsNet (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsNet

Model Structure
Network	2408404 - Disclosure - Goodwill and Intangible Assets - Amortization Expense (Details) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsAmortizationExpenseDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Goodwill and Intangible Assets Disclosure [Abstract]	Abstract	duration		us-gaap:GoodwillAndIntangibleAssetsDisclosureAbstract
2	us-gaap:FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract (terseLabel)	Abstract	duration		us-gaap:FiniteLivedIntangibleAssetsFutureAmortizationExpenseCurrentAndFiveSucceedingFiscalYearsAbstract
3	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
4	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
5	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
6	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
7	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
8	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
9	us-gaap:FiniteLivedIntangibleAssetsNet (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:FiniteLivedIntangibleAssetsNet

Model Structure
Network	2409402 - Disclosure - Liabilities (Details) (http://www.facebook.com/role/LiabilitiesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Accounts Payable and Accrued Liabilities [Abstract]	Abstract	duration		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
2	us-gaap:AccruedLiabilitiesAndOtherLiabilitiesAbstract (terseLabel)	Abstract	duration		us-gaap:AccruedLiabilitiesAndOtherLiabilitiesAbstract
3	us-gaap:EmployeeRelatedLiabilitiesCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:EmployeeRelatedLiabilitiesCurrent
4	fb:PropertyandEquipmentAccruedLiabilities (terseLabel)	Concept (Monetary)	instant	credit	fb:PropertyandEquipmentAccruedLiabilities
5	fb:NotionalCashPoolOverdraftBalance (terseLabel)	Concept (Monetary)	instant	credit	fb:NotionalCashPoolOverdraftBalance
6	us-gaap:TaxesPayableCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:TaxesPayableCurrent
7	us-gaap:OtherAccruedLiabilitiesCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OtherAccruedLiabilitiesCurrent
8	Accrued expenses and other current liabilities	Concept (Monetary)	instant	credit	us-gaap:AccruedLiabilitiesCurrent
9	us-gaap:OtherLiabilitiesAbstract (terseLabel)	Abstract	duration		us-gaap:OtherLiabilitiesAbstract
10	fb:IncomeTaxesPayableNoncurrent (terseLabel)	Concept (Monetary)	instant	credit	fb:IncomeTaxesPayableNoncurrent
11	us-gaap:DeferredIncomeTaxLiabilitiesNet (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredIncomeTaxLiabilitiesNet
12	us-gaap:OtherSundryLiabilitiesNoncurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OtherSundryLiabilitiesNoncurrent
13	Other liabilities	Concept (Monetary)	instant	credit	us-gaap:OtherLiabilitiesNoncurrent

Model Structure
Network	2410401 - Disclosure - Long-term Debt - Borrowings (Details) (http://www.facebook.com/role/LongTermDebtBorrowingsDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Debt Disclosure [Abstract]	Abstract	duration		us-gaap:DebtDisclosureAbstract
2	us-gaap:DebtInstrumentTable (terseLabel)	Table	duration		us-gaap:DebtInstrumentTable
3	us-gaap:LongtermDebtTypeAxis (terseLabel)	Axis	duration		us-gaap:LongtermDebtTypeAxis
4	us-gaap:LongtermDebtTypeDomain (terseLabel)	Member	duration		us-gaap:LongtermDebtTypeDomain
5	us-gaap:RevolvingCreditFacilityMember (terseLabel)	Member	duration		us-gaap:RevolvingCreditFacilityMember
6	us-gaap:DebtInstrumentLineItems (terseLabel)	LineItems	duration		us-gaap:DebtInstrumentLineItems
7	us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
8	us-gaap:LineOfCredit (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:LineOfCredit

Model Structure
Network	2411402 - Disclosure - Commitments and Contingencies (Details) (http://www.facebook.com/role/CommitmentsAndContingenciesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Commitments and Contingencies Disclosure [Abstract]	Abstract	duration		us-gaap:CommitmentsAndContingenciesDisclosureAbstract
2	fb:CommitmentsAndContingenciesDisclosureTable (terseLabel)	Table	duration		fb:CommitmentsAndContingenciesDisclosureTable
3	srt:RangeAxis (terseLabel)	Axis	duration		srt:RangeAxis
4	srt:RangeMember (terseLabel)	Member	duration		srt:RangeMember
5	srt:MinimumMember (verboseLabel)	Member	duration		srt:MinimumMember
6	srt:MaximumMember (verboseLabel)	Member	duration		srt:MaximumMember
7	fb:CommitmentsAndContingenciesDisclosureLineItems (terseLabel)	LineItems	duration		fb:CommitmentsAndContingenciesDisclosureLineItems
8	us-gaap:LeasesAbstract (terseLabel)	Abstract	duration		us-gaap:LeasesAbstract
9	us-gaap:OperatingLeasesFutureMinimumPaymentsDueAbstract (terseLabel)	Abstract	duration		us-gaap:OperatingLeasesFutureMinimumPaymentsDueAbstract
10	us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent
11	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoYears (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInTwoYears
12	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInThreeYears (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInThreeYears
13	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInFourYears (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInFourYears
14	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInFiveYears (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueInFiveYears
15	us-gaap:OperatingLeasesFutureMinimumPaymentsDueThereafter (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDueThereafter
16	us-gaap:OperatingLeasesFutureMinimumPaymentsDue (totalLabel)	Concept (Monetary)	instant	credit	us-gaap:OperatingLeasesFutureMinimumPaymentsDue
17	us-gaap:OperatingLeasesRentExpenseNet (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:OperatingLeasesRentExpenseNet
18	fb:ContractualObligationAbstract (terseLabel)	Abstract	duration		fb:ContractualObligationAbstract
19	us-gaap:ContractualObligation (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:ContractualObligation
20	us-gaap:LongtermPurchaseCommitmentPeriod (terseLabel)	Concept (Duration)	duration		us-gaap:LongtermPurchaseCommitmentPeriod
21	us-gaap:LossContingencyNewClaimsFiledNumber (terseLabel)	Concept (Integer)	duration		us-gaap:LossContingencyNewClaimsFiledNumber

Model Structure
Network	2412402 - Disclosure - Stockholders' Equity - Common Stock (Details) (http://www.facebook.com/role/StockholdersEquityCommonStockDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Equity [Abstract]	Abstract	duration	us-gaap:EquityAbstract
2	us-gaap:ScheduleOfStockByClassTable (terseLabel)	Table	duration	us-gaap:ScheduleOfStockByClassTable
3	us-gaap:StatementClassOfStockAxis (terseLabel)	Axis	duration	us-gaap:StatementClassOfStockAxis
4	us-gaap:ClassOfStockDomain (terseLabel)	Member	duration	us-gaap:ClassOfStockDomain
5	us-gaap:CommonClassAMember (terseLabel)	Member	duration	us-gaap:CommonClassAMember
6	us-gaap:CommonClassBMember (terseLabel)	Member	duration	us-gaap:CommonClassBMember
7	us-gaap:ClassOfStockLineItems (terseLabel)	LineItems	duration	us-gaap:ClassOfStockLineItems
8	us-gaap:CommonStockSharesAuthorized (terseLabel)	Concept (Shares)	instant	us-gaap:CommonStockSharesAuthorized
9	us-gaap:CommonStockParOrStatedValuePerShare (terseLabel)	Concept (Per-Share)	instant	us-gaap:CommonStockParOrStatedValuePerShare
10	fb:CommonStockNumberOfVotesByClass (terseLabel)	Concept (Integer)	instant	fb:CommonStockNumberOfVotesByClass
11	us-gaap:CommonStockSharesIssued (verboseLabel)	Concept (Shares)	instant	us-gaap:CommonStockSharesIssued
12	Common stock, shares, outstanding (in shares)	Concept (Shares)	instant	us-gaap:CommonStockSharesOutstanding

Model Structure
Network	2412403 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details) (http://www.facebook.com/role/StockholdersEquityShareRepurchaseProgramDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Equity [Abstract]	Abstract	duration		us-gaap:EquityAbstract
2	us-gaap:StockRepurchaseProgramAuthorizedAmount1 (verboseLabel)	Concept (Monetary)	instant	credit	us-gaap:StockRepurchaseProgramAuthorizedAmount1
3	us-gaap:StockRepurchasedAndRetiredDuringPeriodShares (terseLabel)	Concept (Shares)	duration		us-gaap:StockRepurchasedAndRetiredDuringPeriodShares
4	us-gaap:StockRepurchasedAndRetiredDuringPeriodValue (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
5	us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

Model Structure
Network	2412404 - Disclosure - Stockholders' Equity - Share-based Compensation Plans (Detail) (http://www.facebook.com/role/StockholdersEquityShareBasedCompensationPlansDetail)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Equity [Abstract]	Abstract	duration	us-gaap:EquityAbstract
2	us-gaap:ShareBasedCompensationAbstract (terseLabel)	Abstract	duration	us-gaap:ShareBasedCompensationAbstract
3	Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]	Table	duration	us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable
4	us-gaap:SubsequentEventTypeAxis (terseLabel)	Axis	duration	us-gaap:SubsequentEventTypeAxis
5	us-gaap:SubsequentEventTypeDomain (terseLabel)	Member	duration	us-gaap:SubsequentEventTypeDomain
6	us-gaap:SubsequentEventMember (terseLabel)	Member	duration	us-gaap:SubsequentEventMember
7	us-gaap:PlanNameAxis (terseLabel)	Axis	duration	us-gaap:PlanNameAxis
8	us-gaap:PlanNameDomain (terseLabel)	Member	duration	us-gaap:PlanNameDomain
9	fb:StockOptionPlanTwentyTwelveMember (terseLabel)	Member	duration	fb:StockOptionPlanTwentyTwelveMember
10	Share-based Compensation Arrangement by Share-based Payment Award	LineItems	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
11	fb:ShareBasedEmployeeCompensationPlansNumber (terseLabel)	Concept (Integer)	instant	fb:ShareBasedEmployeeCompensationPlansNumber
12	us-gaap:CommonStockCapitalSharesReservedForFutureIssuance (terseLabel)	Concept (Shares)	instant	us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
13	fb:SharesReservedForIssuanceIncreasePercentage (terseLabel)	Concept (Percent)	duration	fb:SharesReservedForIssuanceIncreasePercentage
14	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized (terseLabel)	Concept (Shares)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized

Model Structure
Network	2412405 - Disclosure - Stockholders' Equity - Stock Option Award Activity (Details) (http://www.facebook.com/role/StockholdersEquityStockOptionAwardActivityDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Equity [Abstract]	Abstract	duration		us-gaap:EquityAbstract
2	us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable (terseLabel)	Table	duration		us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable
3	us-gaap:StatementClassOfStockAxis (terseLabel)	Axis	duration		us-gaap:StatementClassOfStockAxis
4	us-gaap:ClassOfStockDomain (terseLabel)	Member	duration		us-gaap:ClassOfStockDomain
5	us-gaap:CommonClassAMember (terseLabel)	Member	duration		us-gaap:CommonClassAMember
6	us-gaap:AwardTypeAxis (terseLabel)	Axis	duration		us-gaap:AwardTypeAxis
7	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain (terseLabel)	Member	duration		us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain
8	us-gaap:EmployeeStockOptionMember (verboseLabel)	Member	duration		us-gaap:EmployeeStockOptionMember
9	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems (terseLabel)	LineItems	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
10	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward (terseLabel)	Abstract	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward
11	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber (periodStartLabel)	Concept (Shares)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
12	us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised (negatedLabel)	Concept (Shares)	duration		us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
13	Ending balance (in shares)	Concept (Shares)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
14	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber (terseLabel)	Concept (Shares)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
15	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward (terseLabel)	Abstract	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward
16	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice (periodStartLabel)	Concept (Per-Share)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
17	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice (terseLabel)	Concept (Per-Share)	duration		us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
18	Ending Balance (in dollars per share)	Concept (Per-Share)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
19	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice (terseLabel)	Concept (Per-Share)	instant		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
20	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract (terseLabel)	Abstract	duration		fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract
21	us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 (terseLabel)	Concept (Duration)	duration		us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
22	us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1 (terseLabel)	Concept (Duration)	duration		us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
23	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract (terseLabel)	Abstract	duration		fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract
24	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue (periodEndLabel)	Concept (Monetary)	instant	debit	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
25	us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
26	us-gaap:SharePrice (verboseLabel)	Concept (Per-Share)	instant		us-gaap:SharePrice
27	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross (terseLabel)	Concept (Shares)	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
28	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod (terseLabel)	Concept (Shares)	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
29	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

Model Structure
Network	2412406 - Disclosure - Stockholders' Equity - RSU Award Activity (Details) (http://www.facebook.com/role/StockholdersEquityRsuAwardActivityDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Equity [Abstract]	Abstract	duration	us-gaap:EquityAbstract
2	us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable (terseLabel)	Table	duration	us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable
3	us-gaap:AwardTypeAxis (terseLabel)	Axis	duration	us-gaap:AwardTypeAxis
4	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain (terseLabel)	Member	duration	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain
5	us-gaap:RestrictedStockUnitsRSUMember (terseLabel)	Member	duration	us-gaap:RestrictedStockUnitsRSUMember
6	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems (terseLabel)	LineItems	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
7	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRollforwardAbstract (terseLabel)	Abstract	duration	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRollforwardAbstract
8	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber (periodStartLabel)	Concept (Shares)	instant	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
9	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod (terseLabel)	Concept (Shares)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
10	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod (negatedLabel)	Concept (Shares)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
11	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod (negatedLabel)	Concept (Shares)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
12	Unvested at end of period (in shares)	Concept (Shares)	instant	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
13	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValueAbstract (terseLabel)	Abstract	duration	fb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValueAbstract
14	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue (periodStartLabel)	Concept (Per-Share)	instant	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
15	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue (terseLabel)	Concept (Per-Share)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
16	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue (terseLabel)	Concept (Per-Share)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
17	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue (terseLabel)	Concept (Per-Share)	duration	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
18	Unvested at end of period (in dollars per share)	Concept (Per-Share)	instant	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

Model Structure
Network	2412407 - Disclosure - Stockholders' Equity - Additional Award Disclosures (Details) (http://www.facebook.com/role/StockholdersEquityAdditionalAwardDisclosuresDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Equity [Abstract]	Abstract	duration		us-gaap:EquityAbstract
2	Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]	Table	duration		us-gaap:ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable
3	us-gaap:AwardTypeAxis (terseLabel)	Axis	duration		us-gaap:AwardTypeAxis
4	us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain (terseLabel)	Member	duration		us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain
5	us-gaap:RestrictedStockUnitsRSUMember (terseLabel)	Member	duration		us-gaap:RestrictedStockUnitsRSUMember
6	Share-based Compensation Arrangement by Share-based Payment Award	LineItems	duration		us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
7	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
8	us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized (verboseLabel)	Concept (Monetary)	instant	debit	us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
9	us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 (verboseLabel)	Concept (Duration)	duration		us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1

Model Structure
Network	2413402 - Disclosure - Interest and other income (expense), net (Details) (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNetDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Nonoperating Income (Expense) [Abstract]	Abstract	duration		us-gaap:NonoperatingIncomeExpenseAbstract
2	us-gaap:InvestmentIncomeInterest (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:InvestmentIncomeInterest
3	us-gaap:InterestExpense (negatedTerseLabel)	Concept (Monetary)	duration	debit	us-gaap:InterestExpense
4	us-gaap:ForeignCurrencyTransactionGainLossBeforeTax (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
5	us-gaap:OtherNonoperatingIncomeExpense (verboseLabel)	Concept (Monetary)	duration	credit	us-gaap:OtherNonoperatingIncomeExpense
6	us-gaap:NonoperatingIncomeExpense (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:NonoperatingIncomeExpense

Model Structure
Network	2414402 - Disclosure - Income Taxes - Schedule for Income Before Income Tax (Details) (http://www.facebook.com/role/IncomeTaxesScheduleForIncomeBeforeIncomeTaxDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
3	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
4	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (totalLabel)	Concept (Monetary)	duration	credit	us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Model Structure
Network	2414403 - Disclosure - Income Taxes - Provision for Income Taxes (Details) (http://www.facebook.com/role/IncomeTaxesProvisionForIncomeTaxesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:IncomeTaxExpenseBenefitContinuingOperationsAbstract (terseLabel)	Abstract	duration		us-gaap:IncomeTaxExpenseBenefitContinuingOperationsAbstract
3	us-gaap:CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract (terseLabel)	Abstract	duration		us-gaap:CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract
4	us-gaap:CurrentFederalTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:CurrentFederalTaxExpenseBenefit
5	us-gaap:CurrentStateAndLocalTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:CurrentStateAndLocalTaxExpenseBenefit
6	us-gaap:CurrentForeignTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:CurrentForeignTaxExpenseBenefit
7	us-gaap:CurrentIncomeTaxExpenseBenefit (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:CurrentIncomeTaxExpenseBenefit
8	us-gaap:DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract (terseLabel)	Abstract	duration		us-gaap:DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract
9	us-gaap:DeferredFederalIncomeTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:DeferredFederalIncomeTaxExpenseBenefit
10	us-gaap:DeferredStateAndLocalIncomeTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:DeferredStateAndLocalIncomeTaxExpenseBenefit
11	us-gaap:DeferredForeignIncomeTaxExpenseBenefit (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:DeferredForeignIncomeTaxExpenseBenefit
12	fb:TotalDeferredIncomeTaxExpenseBenefit (totalLabel)	Concept (Monetary)	duration	debit	fb:TotalDeferredIncomeTaxExpenseBenefit
13	us-gaap:IncomeTaxExpenseBenefit (totalLabel)	Concept (Monetary)	duration	debit	us-gaap:IncomeTaxExpenseBenefit

Model Structure
Network	2414404 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Details) (http://www.facebook.com/role/IncomeTaxesEffectiveIncomeTaxRateReconciliationDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration	us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract (terseLabel)	Abstract	duration	us-gaap:EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract
3	us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (terseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
4	us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (terseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
5	us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (negatedTerseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
6	us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (terseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
7	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent (negatedTerseLabel)	Concept (Percent)	duration	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent
8	us-gaap:EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (negatedTerseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
9	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent (terseLabel)	Concept (Percent)	duration	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent
10	us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments (terseLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments
11	us-gaap:EffectiveIncomeTaxRateContinuingOperations (totalLabel)	Concept (Percent)	duration	us-gaap:EffectiveIncomeTaxRateContinuingOperations

Model Structure
Network	2414405 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) (http://www.facebook.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract (terseLabel)	Abstract	duration		us-gaap:ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract
3	us-gaap:ComponentsOfDeferredTaxAssetsAbstract (terseLabel)	Abstract	duration		us-gaap:ComponentsOfDeferredTaxAssetsAbstract
4	us-gaap:DeferredTaxAssetsOperatingLossCarryforwards (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
5	us-gaap:DeferredTaxAssetsTaxCreditCarryforwards (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsTaxCreditCarryforwards
6	us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
7	us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
8	us-gaap:DeferredTaxAssetsOther (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsOther
9	us-gaap:DeferredTaxAssetsGross (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsGross
10	Less: valuation allowance	Concept (Monetary)	instant	credit	us-gaap:DeferredTaxAssetsValuationAllowance
11	us-gaap:DeferredTaxAssetsNet (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsNet
12	us-gaap:ComponentsOfDeferredTaxLiabilitiesAbstract (terseLabel)	Abstract	duration		us-gaap:ComponentsOfDeferredTaxLiabilitiesAbstract
13	us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment (negatedTerseLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
14	us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (negatedTerseLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
15	us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings (negatedTerseLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings
16	us-gaap:DeferredIncomeTaxLiabilities (negatedTotalLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredIncomeTaxLiabilities
17	us-gaap:DeferredTaxAssetsLiabilitiesNet (totalLabel)	Concept (Monetary)	instant	debit	us-gaap:DeferredTaxAssetsLiabilitiesNet

Model Structure
Network	2414406 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) (http://www.facebook.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	us-gaap:ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward (terseLabel)	Abstract	duration		us-gaap:ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward
3	us-gaap:UnrecognizedTaxBenefits (periodStartLabel)	Concept (Monetary)	instant	credit	us-gaap:UnrecognizedTaxBenefits
4	us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
5	us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (negatedTerseLabel)	Concept (Monetary)	duration	debit	us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
6	us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions (terseLabel)	Concept (Monetary)	duration	credit	us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
7	us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (negatedTerseLabel)	Concept (Monetary)	duration	debit	us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
8	Gross unrecognized tax benefits-end of period	Concept (Monetary)	instant	credit	us-gaap:UnrecognizedTaxBenefits

Model Structure
Network	2414407 - Disclosure - Income Taxes - Narrative (Detail) (http://www.facebook.com/role/IncomeTaxesNarrativeDetail)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Income Tax Disclosure [Abstract]	Abstract	duration		us-gaap:IncomeTaxDisclosureAbstract
2	fb:IncomeTaxDisclosureTable (terseLabel)	Table	duration		fb:IncomeTaxDisclosureTable
3	us-gaap:TaxPeriodAxis (terseLabel)	Axis	duration		us-gaap:TaxPeriodAxis
4	us-gaap:TaxPeriodDomain (terseLabel)	Member	duration		us-gaap:TaxPeriodDomain
5	fb:TaxYears2011Through2013Member (terseLabel)	Member	duration		fb:TaxYears2011Through2013Member
6	us-gaap:IncomeTaxAuthorityAxis (terseLabel)	Axis	duration		us-gaap:IncomeTaxAuthorityAxis
7	us-gaap:IncomeTaxAuthorityDomain (terseLabel)	Member	duration		us-gaap:IncomeTaxAuthorityDomain
8	us-gaap:InternalRevenueServiceIRSMember (terseLabel)	Member	duration		us-gaap:InternalRevenueServiceIRSMember
9	us-gaap:StateAndLocalJurisdictionMember (terseLabel)	Member	duration		us-gaap:StateAndLocalJurisdictionMember
10	srt:RangeAxis (terseLabel)	Axis	duration		srt:RangeAxis
11	srt:RangeMember (terseLabel)	Member	duration		srt:RangeMember
12	srt:MinimumMember (verboseLabel)	Member	duration		srt:MinimumMember
13	srt:MaximumMember (verboseLabel)	Member	duration		srt:MaximumMember
14	fb:IncomeTaxDisclosureLineItems (terseLabel)	LineItems	duration		fb:IncomeTaxDisclosureLineItems
15	us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (terseLabel)	Concept (Percent)	duration		us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
16	us-gaap:DeferredTaxAssetsValuationAllowance (verboseLabel)	Concept (Monetary)	instant	credit	us-gaap:DeferredTaxAssetsValuationAllowance
17	us-gaap:OperatingLossCarryforwards (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:OperatingLossCarryforwards
18	us-gaap:TaxCreditCarryforwardAmount (terseLabel)	Concept (Monetary)	instant	debit	us-gaap:TaxCreditCarryforwardAmount
19	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold (terseLabel)	Concept (Percent)	instant		fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold
20	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod (terseLabel)	Concept (Duration)	duration		fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod
21	us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued
22	Unrecognized tax benefits	Concept (Monetary)	instant	credit	us-gaap:UnrecognizedTaxBenefits
23	us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate (terseLabel)	Concept (Monetary)	instant	credit	us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
24	us-gaap:IncomeTaxExaminationEstimateOfPossibleLoss (terseLabel)	Concept (Monetary)	duration	debit	us-gaap:IncomeTaxExaminationEstimateOfPossibleLoss

Model Structure
Network	2415402 - Disclosure - Geographical Information - Property and Equipment (Details) (http://www.facebook.com/role/GeographicalInformationPropertyAndEquipmentDetails)
Table	(implied)

#	Label	Report Element Class	Period Type	Balance	Name
1	Segments, Geographical Areas [Abstract]	Abstract	duration		us-gaap:SegmentsGeographicalAreasAbstract
2	us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable (terseLabel)	Table	duration		us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable
3	srt:StatementGeographicalAxis (terseLabel)	Axis	duration		srt:StatementGeographicalAxis
4	srt:SegmentGeographicalDomain (terseLabel)	Member	duration		srt:SegmentGeographicalDomain
5	country:US (terseLabel)	Member	duration		country:US
6	us-gaap:NonUsMember (terseLabel)	Member	duration		us-gaap:NonUsMember
7	us-gaap:RevenuesFromExternalCustomersAndLongLivedAssetsLineItems (verboseLabel)	LineItems	duration		us-gaap:RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
8	Property and equipment, net	Concept (Monetary)	instant	debit	us-gaap:PropertyPlantAndEquipmentNet

Fact Tables

The colours used for the fact values are significant, and have the following meanings:

Reported facts that have been checked by consistency rules are in green
derived (imputed) facts are in blue
inconsistent facts in red
...and the rest (reported but unckecked) are either in gray (if some rule failed to execute) or black (if no rules exist for the fact's concept)

Fact Table
Network	0001000 - Document - Document and Entity Information (http://www.facebook.com/role/DocumentAndEntityInformation)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Amendment Flag	false
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Current Fiscal Year End Date	--12-31
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Document Fiscal Period Focus	FY
4	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Document Fiscal Year Focus	2018
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Document Period End Date	2018-12-31
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Document Type	10-K
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Central Index Key	0001326801
8	0001326801 (http://www.sec.gov/CIK)	2019-01-28	Common Class A [Member]	Entity Common Stock, Shares Outstanding	2385533940	xbrli:shares	INF
9	0001326801 (http://www.sec.gov/CIK)	2019-01-28	Common Class B [Member]	Entity Common Stock, Shares Outstanding	468455860	xbrli:shares	INF
10	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Current Reporting Status	Yes
11	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Emerging Growth Company	false
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Filer Category	Large Accelerated Filer
13	0001326801 (http://www.sec.gov/CIK)	2018-06-29	Class of Stock [Domain]	Entity Public Float	486000000000	iso4217:USD	-9
14	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Registrant Name	FACEBOOK INC
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Shell Company	false
16	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Small Business	false
17	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Voluntary Filers	No
18	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Entity Well-known Seasoned Issuer	Yes
19	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Trading Symbol	FB

Fact Table
Network	1001000 - Statement - CONSOLIDATED BALANCE SHEETS (http://www.facebook.com/role/ConsolidatedBalanceSheets)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accounts Payable, Current	380000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accounts Payable, Current	820000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accounts Payable, Other, Current	390000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accounts Payable, Other, Current	541000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accounts Receivable, Net, Current	5832000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accounts Receivable, Net, Current	7587000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accrued Liabilities, Current	2892000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accrued Liabilities, Current	5509000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accumulated Other Comprehensive Income (Loss), Net of Tax	-227000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accumulated Other Comprehensive Income (Loss), Net of Tax	-760000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Additional Paid in Capital	40584000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Additional Paid in Capital	42906000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Assets	84524000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Assets	97334000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Assets, Current	48563000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Assets, Current	50480000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Debt Securities, Available-for-sale, Current	33632000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Debt Securities, Available-for-sale, Current	31095000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-12-31	null	Cash and Cash Equivalents, at Carrying Value	8903000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Cash and Cash Equivalents, at Carrying Value	8079000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Cash and Cash Equivalents, at Carrying Value	10019000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Commitments and Contingencies	null	iso4217:USD
23	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Commitments and Contingencies	null	iso4217:USD
24	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Common Stock, Value, Issued	0	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Common Stock, Value, Issued	0	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Contract with Customer, Liability, Current	98000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Contract with Customer, Liability, Current	147000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2016-12-31	null	Goodwill	18122000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Goodwill	18221000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Goodwill	18301000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Intangible Assets, Net (Excluding Goodwill)	1884000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Intangible Assets, Net (Excluding Goodwill)	1294000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Liabilities	10177000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Liabilities	13207000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Liabilities and Equity	84524000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Liabilities and Equity	97334000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Liabilities, Current	3760000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Liabilities, Current	7017000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Other Assets, Noncurrent	2135000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Other Assets, Noncurrent	2576000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Other Liabilities, Noncurrent	6417000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Other Liabilities, Noncurrent	6190000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Prepaid Expense and Other Assets, Current	1020000000	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Prepaid Expense and Other Assets, Current	1779000000	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Property, Plant and Equipment, Net	13721000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Property, Plant and Equipment, Net	24683000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Retained Earnings (Accumulated Deficit)	33990000000	iso4217:USD	-6
48	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Retained Earnings (Accumulated Deficit)	41981000000	iso4217:USD	-6
49	0001326801 (http://www.sec.gov/CIK)	2015-12-31	null	Stockholders' Equity Attributable to Parent	44218000000	iso4217:USD	-6
50	0001326801 (http://www.sec.gov/CIK)	2016-12-31	null	Stockholders' Equity Attributable to Parent	59194000000	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Stockholders' Equity Attributable to Parent	74347000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Stockholders' Equity Attributable to Parent	84127000000	iso4217:USD	-6

Fact Table
Network	1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) (http://www.facebook.com/role/ConsolidatedBalanceSheetsParenthetical)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Class of Stock [Domain]	Allowance for Doubtful Accounts Receivable, Current	189000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Class of Stock [Domain]	Allowance for Doubtful Accounts Receivable, Current	229000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Class of Stock [Domain]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Class of Stock [Domain]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares Authorized	5000000000	xbrli:shares	INF
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares Authorized	4141000000	xbrli:shares	INF
9	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares Authorized	5000000000	xbrli:shares	INF
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares Authorized	4141000000	xbrli:shares	INF
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares, Issued	2397000000	xbrli:shares	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares, Issued	509000000	xbrli:shares	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares, Issued	2385000000	xbrli:shares	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares, Issued	469000000	xbrli:shares	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares, Outstanding	2397000000	xbrli:shares	-6
16	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares, Outstanding	509000000	xbrli:shares	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares, Outstanding	2385000000	xbrli:shares	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares, Outstanding	469000000	xbrli:shares	-6

Fact Table
Network	1002000 - Statement - CONSOLIDATED STATEMENTS OF INCOME (http://www.facebook.com/role/ConsolidatedStatementsOfIncome)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Allocated Share-based Compensation Expense	3218000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Cost of Sales [Member]	Allocated Share-based Compensation Expense	113000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	General and Administrative Expense [Member]	Allocated Share-based Compensation Expense	243000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Research and Development Expense [Member]	Allocated Share-based Compensation Expense	2494000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Selling and Marketing Expense [Member]	Allocated Share-based Compensation Expense	368000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Allocated Share-based Compensation Expense	3723000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Cost of Sales [Member]	Allocated Share-based Compensation Expense	178000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	General and Administrative Expense [Member]	Allocated Share-based Compensation Expense	289000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Research and Development Expense [Member]	Allocated Share-based Compensation Expense	2820000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Selling and Marketing Expense [Member]	Allocated Share-based Compensation Expense	436000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Allocated Share-based Compensation Expense	4152000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Cost of Sales [Member]	Allocated Share-based Compensation Expense	284000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	General and Administrative Expense [Member]	Allocated Share-based Compensation Expense	335000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Research and Development Expense [Member]	Allocated Share-based Compensation Expense	3022000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Selling and Marketing Expense [Member]	Allocated Share-based Compensation Expense	511000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Cost of Revenue	3789000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Cost of Revenue	5454000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Cost of Revenue	9355000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Costs and Expenses	15211000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Costs and Expenses	20450000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Costs and Expenses	30925000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Earnings Per Share, Basic	3.56	iso4217:USD/xbrli:shares	2
23	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Earnings Per Share, Basic	5.49	iso4217:USD/xbrli:shares	2
24	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Earnings Per Share, Basic	7.65	iso4217:USD/xbrli:shares	2
25	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Earnings Per Share, Diluted	3.49	iso4217:USD/xbrli:shares	2
26	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Earnings Per Share, Diluted	5.39	iso4217:USD/xbrli:shares	2
27	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Earnings Per Share, Diluted	7.57	iso4217:USD/xbrli:shares	2
28	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	General and Administrative Expense	1731000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	General and Administrative Expense	2517000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	General and Administrative Expense	3451000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	12518000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	20594000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	25361000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Income Tax Expense (Benefit)	2301000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Income Tax Expense (Benefit)	4660000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Income Tax Expense (Benefit)	3249000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	10188000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	15920000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	22111000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Nonoperating Income (Expense)	91000000	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Nonoperating Income (Expense)	391000000	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Nonoperating Income (Expense)	448000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Operating Income (Loss)	12427000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Operating Income (Loss)	20203000000	iso4217:USD	-6
48	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Operating Income (Loss)	24913000000	iso4217:USD	-6
49	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Research and Development Expense	5919000000	iso4217:USD	-6
50	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Research and Development Expense	7754000000	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Research and Development Expense	10273000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Selling and Marketing Expense	3772000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Selling and Marketing Expense	4725000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Selling and Marketing Expense	7846000000	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	29000000	iso4217:USD	-6
59	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	14000000	iso4217:USD	-6
60	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	1000000	iso4217:USD	-6
61	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2925000000	xbrli:shares	-6
62	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2956000000	xbrli:shares	-6
63	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2921000000	xbrli:shares	-6
64	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Basic	2863000000	xbrli:shares	-6
65	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Basic	2901000000	xbrli:shares	-6
66	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Statement Location [Domain]	Weighted Average Number of Shares Outstanding, Basic	2890000000	xbrli:shares	-6

Fact Table
Network	1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (http://www.facebook.com/role/ConsolidatedStatementsOfComprehensiveIncome)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax (label)	-96000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax (label)	-90000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	fb:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesAdjustmentandOtherNetofTax (label)	-52000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	9969000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	16410000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Comprehensive Income (Loss), Net of Tax, Attributable to Parent	21610000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	-152000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	566000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	-450000000	iso4217:USD	-6

Fact Table
Network	1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (http://www.facebook.com/role/ConsolidatedStatementsOfStockholdersEquity)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Equity Component [Domain]	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption (label)	141000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-12-31	AOCI Attributable to Parent [Member]	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption (label)	-31000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Retained Earnings [Member]	fb:NewAccountingPronouncementOrTaxCutsAndJobsActOf2017EffectOfAdoption (label)	172000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Stock [Member]	fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement (label)	43000000	xbrli:shares	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Stock [Member]	fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement (label)	43000000	xbrli:shares	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Stock [Member]	fb:StockIssuedDuringPeriodSharesRestrictedStockUnitBeforeTaxSettlement (label)	44000000	xbrli:shares	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement (label)	0	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement (label)	0	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	fb:StockIssuedDuringPeriodValueRestrictedStockUnitBeforeTaxSettlement (label)	0	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Adjustments Related to Tax Withholding for Share-based Compensation	6000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Additional Paid-in Capital [Member]	Adjustments Related to Tax Withholding for Share-based Compensation	6000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Adjustments Related to Tax Withholding for Share-based Compensation	3246000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Additional Paid-in Capital [Member]	Adjustments Related to Tax Withholding for Share-based Compensation	1702000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Retained Earnings [Member]	Adjustments Related to Tax Withholding for Share-based Compensation	1544000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Adjustments Related to Tax Withholding for Share-based Compensation	3208000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Additional Paid-in Capital [Member]	Adjustments Related to Tax Withholding for Share-based Compensation	1845000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Retained Earnings [Member]	Adjustments Related to Tax Withholding for Share-based Compensation	1363000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3218000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Additional Paid-in Capital [Member]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3218000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3723000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Additional Paid-in Capital [Member]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3723000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	4152000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Additional Paid-in Capital [Member]	Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	4152000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Common Stock [Member]	Common Stock, Shares, Outstanding	2845000000	xbrli:shares	-6
25	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Common Stock [Member]	Common Stock, Shares, Outstanding	2892000000	xbrli:shares	-6
26	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Stock [Member]	Common Stock, Shares, Outstanding	2906000000	xbrli:shares	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Stock [Member]	Common Stock, Shares, Outstanding	2854000000	xbrli:shares	-6
28	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Equity Component [Domain]	Cumulative Effect of New Accounting Principle in Period of Adoption	1705000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Additional Paid-in Capital [Member]	Cumulative Effect of New Accounting Principle in Period of Adoption	39000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Retained Earnings [Member]	Cumulative Effect of New Accounting Principle in Period of Adoption	1666000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Retained Earnings [Member]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Retained Earnings [Member]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Retained Earnings [Member]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-248000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	AOCI Attributable to Parent [Member]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-248000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	476000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	AOCI Attributable to Parent [Member]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	476000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-502000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	AOCI Attributable to Parent [Member]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-502000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Stock [Member]	Shares Paid for Tax Withholding for Share Based Compensation	21000000	xbrli:shares	-6
44	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Stock [Member]	Shares Paid for Tax Withholding for Share Based Compensation	19000000	xbrli:shares	-6
45	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Stock [Member]	Stock Issued During Period, Shares, Acquisitions	1000000	xbrli:shares	-6
46	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Stock [Member]	Stock Issued During Period, Shares, Acquisitions	2000000	xbrli:shares	-6
47	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Stock [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	3000000	xbrli:shares	-6
48	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Stock [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	3000000	xbrli:shares	-6
49	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Stock [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2000000	xbrli:shares	-6
50	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Stock Issued During Period, Value, Acquisitions	74000000	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Additional Paid-in Capital [Member]	Stock Issued During Period, Value, Acquisitions	74000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Stock Issued During Period, Value, Acquisitions	323000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Additional Paid-in Capital [Member]	Stock Issued During Period, Value, Acquisitions	323000000	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Component [Domain]	Stock Issued During Period, Value, Stock Options Exercised	16000000	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Additional Paid-in Capital [Member]	Stock Issued During Period, Value, Stock Options Exercised	16000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Stock Issued During Period, Value, Stock Options Exercised	13000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Additional Paid-in Capital [Member]	Stock Issued During Period, Value, Stock Options Exercised	13000000	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Stock Issued During Period, Value, Stock Options Exercised	15000000	iso4217:USD	-6
59	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Additional Paid-in Capital [Member]	Stock Issued During Period, Value, Stock Options Exercised	15000000	iso4217:USD	-6
60	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Stock [Member]	Stock Repurchased During Period, Shares	13000000	xbrli:shares	-6
61	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Stock [Member]	Stock Repurchased During Period, Shares	79000000	xbrli:shares	-6
62	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Component [Domain]	Stock Repurchased During Period, Value	2070000000	iso4217:USD	-6
63	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Retained Earnings [Member]	Stock Repurchased During Period, Value	2070000000	iso4217:USD	-6
64	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Component [Domain]	Stock Repurchased During Period, Value	12930000000	iso4217:USD	-6
65	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Retained Earnings [Member]	Stock Repurchased During Period, Value	12930000000	iso4217:USD	-6
66	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Equity Component [Domain]	Stockholders' Equity Attributable to Parent	44218000000	iso4217:USD	-6
67	0001326801 (http://www.sec.gov/CIK)	2015-12-31	AOCI Attributable to Parent [Member]	Stockholders' Equity Attributable to Parent	-455000000	iso4217:USD	-6
68	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Additional Paid-in Capital [Member]	Stockholders' Equity Attributable to Parent	34886000000	iso4217:USD	-6
69	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Common Stock [Member]	Stockholders' Equity Attributable to Parent	0	iso4217:USD	-6
70	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Retained Earnings [Member]	Stockholders' Equity Attributable to Parent	9787000000	iso4217:USD	-6
71	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Equity Component [Domain]	Stockholders' Equity Attributable to Parent	59194000000	iso4217:USD	-6
72	0001326801 (http://www.sec.gov/CIK)	2016-12-31	AOCI Attributable to Parent [Member]	Stockholders' Equity Attributable to Parent	-703000000	iso4217:USD	-6
73	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Additional Paid-in Capital [Member]	Stockholders' Equity Attributable to Parent	38227000000	iso4217:USD	-6
74	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Common Stock [Member]	Stockholders' Equity Attributable to Parent	0	iso4217:USD	-6
75	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Retained Earnings [Member]	Stockholders' Equity Attributable to Parent	21670000000	iso4217:USD	-6
76	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Equity Component [Domain]	Stockholders' Equity Attributable to Parent	74347000000	iso4217:USD	-6
77	0001326801 (http://www.sec.gov/CIK)	2017-12-31	AOCI Attributable to Parent [Member]	Stockholders' Equity Attributable to Parent	-227000000	iso4217:USD	-6
78	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Additional Paid-in Capital [Member]	Stockholders' Equity Attributable to Parent	40584000000	iso4217:USD	-6
79	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Stock [Member]	Stockholders' Equity Attributable to Parent	0	iso4217:USD	-6
80	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Retained Earnings [Member]	Stockholders' Equity Attributable to Parent	33990000000	iso4217:USD	-6
81	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Equity Component [Domain]	Stockholders' Equity Attributable to Parent	84127000000	iso4217:USD	-6
82	0001326801 (http://www.sec.gov/CIK)	2018-12-31	AOCI Attributable to Parent [Member]	Stockholders' Equity Attributable to Parent	-760000000	iso4217:USD	-6
83	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Additional Paid-in Capital [Member]	Stockholders' Equity Attributable to Parent	42906000000	iso4217:USD	-6
84	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Stock [Member]	Stockholders' Equity Attributable to Parent	0	iso4217:USD	-6
85	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Retained Earnings [Member]	Stockholders' Equity Attributable to Parent	41981000000	iso4217:USD	-6

Fact Table
Network	1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (http://www.facebook.com/role/ConsolidatedStatementsOfCashFlows)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	fb:ChangeinUnsettledRepurchasesofCommonStock (label)	0	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	fb:ChangeinUnsettledRepurchasesofCommonStock (label)	94000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	fb:ChangeinUnsettledRepurchasesofCommonStock (label)	51000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions (label)	136000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions (label)	495000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	fb:IncreaseDecreaseinPrepaidsandLiabilitiesRelatedtoPropertyandEquipmentAdditions (label)	918000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets (label)	123000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets (label)	122000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	fb:PaymentsToAcquireBusinessesNetOfCashAcquiredAndPurchasesOfIntangibleAndOtherAssets (label)	137000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations (label)	312000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations (label)	0	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	fb:RepaymentsOfCapitalLeaseAndOtherFinancingObligations (label)	0	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	fb:SettlementOfContingentConsiderationLiability (label)	33000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	fb:SettlementOfContingentConsiderationLiability (label)	102000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	fb:SettlementOfContingentConsiderationLiability (label)	0	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Balance Sheet Location [Domain]	Cash and Cash Equivalents, at Carrying Value	8903000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Balance Sheet Location [Domain]	Cash and Cash Equivalents, at Carrying Value	8079000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Balance Sheet Location [Domain]	Cash and Cash Equivalents, at Carrying Value	10019000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	5166000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	9109000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	8204000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	10124000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	3943000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	-905000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	1920000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Deferred Income Tax Expense (Benefit)	-457000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Deferred Income Tax Expense (Benefit)	-377000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Deferred Income Tax Expense (Benefit)	286000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Depreciation, Depletion and Amortization	2342000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Depreciation, Depletion and Amortization	3025000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Depreciation, Depletion and Amortization	4315000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	-63000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	232000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	-179000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Income Taxes Paid, Net	1210000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Income Taxes Paid, Net	2117000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Income Taxes Paid, Net	3762000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Payable	14000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Payable	43000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Payable	221000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Receivable	1489000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Receivable	1609000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accounts Receivable	1892000000	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accrued Liabilities	1014000000	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accrued Liabilities	309000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Accrued Liabilities	1417000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Contract with Customer, Liability	35000000	iso4217:USD	-6
48	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Contract with Customer, Liability	4000000	iso4217:USD	-6
49	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Contract with Customer, Liability	53000000	iso4217:USD	-6
50	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Accounts Payable	67000000	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Accounts Payable	95000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Accounts Payable	157000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Noncurrent Liabilities	1262000000	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Noncurrent Liabilities	3083000000	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Noncurrent Liabilities	-634000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Operating Assets	-14000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Operating Assets	-154000000	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Other Operating Assets	159000000	iso4217:USD	-6
59	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Prepaid Expense and Other Assets	159000000	iso4217:USD	-6
60	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Prepaid Expense and Other Assets	192000000	iso4217:USD	-6
61	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Increase (Decrease) in Prepaid Expense and Other Assets	690000000	iso4217:USD	-6
62	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Interest Paid, Excluding Capitalized Interest, Operating Activities	11000000	iso4217:USD	-6
63	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Interest Paid, Excluding Capitalized Interest, Operating Activities	0	iso4217:USD	-6
64	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Interest Paid, Excluding Capitalized Interest, Operating Activities	1000000	iso4217:USD	-6
65	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Financing Activities	-310000000	iso4217:USD	-6
66	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Financing Activities	-5235000000	iso4217:USD	-6
67	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Financing Activities	-15572000000	iso4217:USD	-6
68	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Investing Activities	-11792000000	iso4217:USD	-6
69	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Investing Activities	-20118000000	iso4217:USD	-6
70	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Investing Activities	-11603000000	iso4217:USD	-6
71	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Operating Activities	16108000000	iso4217:USD	-6
72	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Operating Activities	24216000000	iso4217:USD	-6
73	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Net Cash Provided by (Used in) Operating Activities	29274000000	iso4217:USD	-6
74	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
75	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
76	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
77	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Other Noncash Income (Expense)	-30000000	iso4217:USD	-6
78	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Other Noncash Income (Expense)	-24000000	iso4217:USD	-6
79	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Other Noncash Income (Expense)	64000000	iso4217:USD	-6
80	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Payments for (Proceeds from) Other Investing Activities	-8000000	iso4217:USD	-6
81	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Payments for (Proceeds from) Other Investing Activities	13000000	iso4217:USD	-6
82	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Payments for (Proceeds from) Other Investing Activities	25000000	iso4217:USD	-6
83	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Payments for Repurchase of Common Stock	0	iso4217:USD	-6
84	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Payments for Repurchase of Common Stock	1976000000	iso4217:USD	-6
85	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Payments for Repurchase of Common Stock	12879000000	iso4217:USD	-6
86	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Payments Related to Tax Withholding for Share-based Compensation	6000000	iso4217:USD	-6
87	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Payments Related to Tax Withholding for Share-based Compensation	3246000000	iso4217:USD	-6
88	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Payments Related to Tax Withholding for Share-based Compensation	3208000000	iso4217:USD	-6
89	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Payments to Acquire Marketable Securities	22341000000	iso4217:USD	-6
90	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Payments to Acquire Marketable Securities	25682000000	iso4217:USD	-6
91	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Payments to Acquire Marketable Securities	14656000000	iso4217:USD	-6
92	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Payments to Acquire Property, Plant, and Equipment	4491000000	iso4217:USD	-6
93	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Payments to Acquire Property, Plant, and Equipment	6733000000	iso4217:USD	-6
94	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Payments to Acquire Property, Plant, and Equipment	13915000000	iso4217:USD	-6
95	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	1261000000	iso4217:USD	-6
96	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	2988000000	iso4217:USD	-6
97	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	4772000000	iso4217:USD	-6
98	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Proceeds from (Payments for) Other Financing Activities	8000000	iso4217:USD	-6
99	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Proceeds from (Payments for) Other Financing Activities	-13000000	iso4217:USD	-6
100	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Proceeds from (Payments for) Other Financing Activities	15000000	iso4217:USD	-6
101	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Proceeds from (Repayments of) Bank Overdrafts	0	iso4217:USD	-6
102	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Proceeds from (Repayments of) Bank Overdrafts	0	iso4217:USD	-6
103	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Proceeds from (Repayments of) Bank Overdrafts	500000000	iso4217:USD	-6
104	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Proceeds from Sale of Debt Securities, Available-for-sale	13894000000	iso4217:USD	-6
105	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Proceeds from Sale of Debt Securities, Available-for-sale	9444000000	iso4217:USD	-6
106	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Proceeds from Sale of Debt Securities, Available-for-sale	12358000000	iso4217:USD	-6
107	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Other Assets [Member]	Restricted Cash and Cash Equivalents	100000000	iso4217:USD	-6
108	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Prepaid Expenses and Other Current Assets [Member]	Restricted Cash and Cash Equivalents	106000000	iso4217:USD	-6
109	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Other Assets [Member]	Restricted Cash and Cash Equivalents	107000000	iso4217:USD	-6
110	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Prepaid Expenses and Other Current Assets [Member]	Restricted Cash and Cash Equivalents	18000000	iso4217:USD	-6
111	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Other Assets [Member]	Restricted Cash and Cash Equivalents	95000000	iso4217:USD	-6
112	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Prepaid Expenses and Other Current Assets [Member]	Restricted Cash and Cash Equivalents	10000000	iso4217:USD	-6
113	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Balance Sheet Location [Domain]	Share-based Compensation	3218000000	iso4217:USD	-6
114	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Balance Sheet Location [Domain]	Share-based Compensation	3723000000	iso4217:USD	-6
115	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Balance Sheet Location [Domain]	Share-based Compensation	4152000000	iso4217:USD	-6

Fact Table
Network	2101100 - Disclosure - Summary of Significant Accounting Policies (http://www.facebook.com/role/SummaryOfSignificantAccountingPolicies)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Basis of Presentation and Significant Accounting Policies [Text Block]

Summary of Significant Accounting Policies

Organization and Description of Business

Facebook was incorporated in Delaware in July 2004. Our mission is to give people the power to build community and bring the world closer together. We generate substantially all of our revenue from advertising.

Basis of Presentation

We prepared the consolidated financial statements in accordance with U.S. generally accepted accounting principles (GAAP). The consolidated financial statements include the accounts of Facebook, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.

Use of Estimates

Conformity with GAAP requires the use of estimates and judgments that affect the reported amounts in the consolidated financial statements and accompanying notes. These estimates form the basis for judgments we make about the carrying values of our assets and liabilities, which are not readily apparent from other sources. We base our estimates and judgments on historical information and on various other assumptions that we believe are reasonable under the circumstances. GAAP requires us to make estimates and judgments in several areas, including, but not limited to, those related to income taxes, loss contingencies, fair value of acquired intangible assets and goodwill, collectability of accounts receivable, fair value of financial instruments, leases, useful lives of intangible assets and property and equipment, and revenue recognition. These estimates are based on management's knowledge about current events and expectations about actions we may undertake in the future. Actual results could differ materially from those estimates.

Revenue Recognition

On January 1, 2018, we adopted Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition (Topic 605), using the modified retrospective transition method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting under Topic 605. The impact of adopting the new revenue standard was not material to our condensed consolidated financial statements and there was no adjustment to beginning retained earnings on January 1, 2018.

Under Topic 606, revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.

We determine revenue recognition through the following steps:


•	identification of the contract, or contracts, with a customer;


•	identification of the performance obligations in the contract;


•	determination of the transaction price;


•	allocation of the transaction price to the performance obligations in the contract; and


•	recognition of revenue when, or as, we satisfy a performance obligation.

Revenue excludes sales and usage-based taxes where it has been determined that we are acting as a pass-through agent.

Revenue disaggregated by revenue source for the years ended December 31, 2018, 2017 and 2016 consists of the following (in millions):



	Year Ended December 31,
	2018		2017⁽¹⁾		2016 ⁽¹⁾
Advertising	$	55,013	$	39,942	$	26,885
Payments and other fees	825		711		753
Total revenue	$	55,838	$	40,653	$	27,638

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

Revenue disaggregated by geography, based on the billing address of our customer, consists of the following (in millions):



	Year Ended December 31,
	2018		2017⁽¹⁾		2016 ⁽¹⁾
Revenue:
US & Canada⁽²⁾	$	25,727	$	19,065	$	13,432
Europe⁽³⁾	13,631		10,126		6,792
Asia-Pacific	11,733		7,921		5,037
Rest of World⁽³⁾	4,747		3,541		2,377
Total revenue	$	55,838	$	40,653	$	27,638

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

^{(2) United States revenue was}^{$24.10 billion}^,^{$17.73 billion}^{, and}^{$12.58 billion}^{for the}^{years ended}^{December 31, 2018}^,²⁰¹⁷^{, and}²⁰¹⁶^.

^{(3) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

Advertising

Advertising revenue is generated by displaying ad products on Facebook, Instagram, Messenger, and third-party affiliated websites or mobile applications. Marketers pay for ad products either directly or through their relationships with advertising agencies or resellers, based on the number of impressions delivered or the number of actions, such as clicks, taken by our users.

Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We recognize revenue from the display of impression-based ads in the contracted period in which the impressions are delivered. Impressions are considered delivered when an ad is displayed to users. We recognize revenue from the delivery of action-based ads in the period in which a user takes the action the marketer contracted for. For advertising revenue arrangements where we are not the principal, we recognize revenue on a net basis.

We may accept a lower consideration than the amount promised per the contract for certain revenue transactions and certain customers may receive cash-based incentives or credits, which are accounted for as variable consideration when estimating the amount of revenue to recognize. We believe that there will not be significant changes to our estimates of variable consideration.

Payments and Other Fees

Payments revenue is comprised of the net fee we receive from developers using our Payments infrastructure.

Other fees revenue consists primarily of revenue from the delivery of consumer hardware devices, as well as revenue from various other sources.

Deferred Revenue and Deposits

Deferred revenue consists of billings and payments from marketers in advance of revenue recognition. Deposits relate to unused balances held on behalf of our users who primarily use these balances to make purchases in games on our platform. Once this balance is utilized by a user, approximately 70% of this amount would then be payable to the developer and the balance would be recognized as revenue. The increase in the deferred revenue balance for the year ended December 31, 2018 was driven by prepayments from marketers, partially offset by revenue recognized that was included in the deferred revenue balance at the beginning of the period.

Our payment terms vary by the products or services offered. The term between billings and when payment is due is not significant. For certain products or services and customer types, we require payment before the products or services are delivered to the customer.

Deferred revenue and deposits consists of the following (in millions):



	December 31,
	2018		2017
Deferred revenue	$	117	$	68
Deposits	30		30
Total deferred revenue and deposits	$	147	$	98

Practical Expedients and Exemptions

We generally expense sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within marketing and sales on our consolidated statements of income.

We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

Cost of Revenue

Our cost of revenue consists primarily of expenses associated with the delivery and distribution of our products. These include expenses related to the operation of our data centers, such as facility and server equipment depreciation, salaries, benefits, and share-based compensation for employees on our operations teams, and energy and bandwidth costs. Cost of revenue also includes costs associated with partner arrangements, including traffic acquisition and content acquisition costs, credit card and other transaction fees related to processing customer transactions, and cost of consumer hardware device inventory sold.

Content acquisition costs

We license and pay to produce content in order to increase engagement on the platform. For licensed content, we capitalize the fee per title and record a corresponding liability at the gross amount of the liability when the license period begins, the cost of the title is known and the title is accepted and available for viewing. The amounts capitalized are limited to estimated net realizable value or fair value on a per title basis. The portion available for viewing within one year is recognized as prepaid expenses and other current assets and the remaining portion as other assets on the consolidated balance sheets. For original content, we capitalize costs associated with the production, including development costs and direct costs, if those amounts are recoverable. Capitalized original content costs are included in other assets on the consolidated balance sheets. Capitalized costs are amortized in cost of revenue on the consolidated statements of income based on historical and estimated viewing patterns.

Capitalized content costs are reviewed when an event or change in circumstances indicates a change in the expected usefulness of the content or that the fair value may be less than amortized cost. If such changes are identified, capitalized content assets will be stated at the lower of unamortized cost, net realizable value or fair value. In addition, unamortized costs for assets that have been, or are expected to be, abandoned are written off.

Capitalized content acquisition costs have not been material to date.

Income Taxes

We record provision for income taxes for the anticipated tax consequences of the reported results of operations using the asset and liability method. Under this method, we recognize deferred income tax assets and liabilities for the expected future consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, as well as for loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. We recognize the deferred income tax effects of a change in tax rates in the period of the enactment.

We record a valuation allowance to reduce our deferred tax assets to the net amount that we believe is more likely than not to be realized. We consider all available evidence, both positive and negative, including historical levels of income, expectations and risks associated with estimates of future taxable income and ongoing tax planning strategies in assessing the need for a valuation allowance.

We recognize tax benefits from uncertain tax positions only if we believe that it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. These uncertain tax positions include our estimates for transfer pricing that have been developed based upon analyses of appropriate arms-length prices. Similarly, our estimates related to uncertain tax positions concerning research tax credits are based on an assessment of whether our available documentation corroborating the nature of our activities supporting the tax credits will be sufficient. Although we believe that we have adequately reserved for our uncertain tax positions (including net interest and penalties), we can provide no assurance that the final tax outcome of these matters will not be materially different. We make adjustments to these reserves when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different from the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on our financial position, results of operations, and cash flows.

On December 22, 2017, the 2017 Tax Cuts and Jobs Act (Tax Act) was enacted into law and the new legislation contains several key tax provisions that affected us, including a one-time mandatory transition tax on accumulated foreign earnings and a reduction of the corporate income tax rate to 21% effective January 1, 2018, among others. We are required to recognize the effect of the tax law changes in the period of enactment, such as determining the transition tax, re-measuring our U.S. deferred tax assets and liabilities as well as reassessing the net realizability of our deferred tax assets and liabilities. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which allowed us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. As a result, we previously provided a provisional estimate of the effect of the Tax Act in our financial statements. In the fourth quarter of 2018, we completed our analysis to determine the effect of the Tax Act and recorded immaterial adjustments as of December 31, 2018. See Note 12 in these notes to the consolidated financial statements for additional information.

Advertising Expense

Advertising costs are expensed when incurred and are included in marketing and sales expenses in the accompanying consolidated statements of income. We incurred advertising expenses of $1.10 billion, $324 million, and $310 million for the years ended December 31, 2018, 2017, and 2016, respectively.

Cash and Cash Equivalents, Marketable Securities, and Restricted Cash

Cash and cash equivalents primarily consist of cash on deposit with banks and investments in money market funds with maturities of 90 days or less from the date of purchase.

We hold investments in marketable securities, consisting of U.S. government securities, U.S. government agency securities, and corporate debt securities. We classify our marketable securities as available-for-sale investments in our current assets because they represent investments of cash available for current operations. Our available-for-sale investments are carried at estimated fair value with any unrealized gains and losses, net of taxes, included in accumulated other comprehensive income (loss) in stockholders' equity. Unrealized losses are charged against interest and other income (expense), net when a decline in fair value is determined to be other-than-temporary. We have not recorded any such impairment charge in the periods presented. We determine realized gains or losses on sale of marketable securities on a specific identification method, and record such gains or losses as interest and other income (expense), net.

We also maintain a multi-currency notional cash pool for our participating entities with a third-party bank provider. Actual cash balances are not physically converted and are not commingled between participating legal entities. As part of the notional cash pool agreement, the bank extends overdraft credit to our participating entities as needed, provided that the overall notionally pooled balance of all accounts in the pool at the end of each day is at least zero. We classify these overdraft balances within accrued expenses and other current liabilities on the accompanying consolidated balance sheets.

We classify certain restricted cash balances within prepaid expenses and other current assets and other assets on the accompanying consolidated balance sheets based upon the term of the remaining restrictions.

Fair Value of Financial Instruments

We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities, which are required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as risks inherent in valuation techniques, transfer restrictions and credit risk. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1-Quoted prices in active markets for identical assets or liabilities.

Level 2-Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3-Inputs that are generally unobservable and typically reflect management's estimate of assumptions that market participants would use in pricing the asset or liability.

Our valuation techniques used to measure the fair value of money market funds and marketable debt securities were derived from quoted market prices or alternative pricing sources and models utilizing market observable inputs.

Accounts Receivable and Allowances

Accounts receivable are recorded and carried at the original invoiced amount less an allowance for any potential uncollectible amounts. We make estimates for the allowance for doubtful accounts and allowance for unbilled receivables based upon our assessment of various factors, including historical experience, the age of the accounts receivable balances, credit quality of our customers, current economic conditions, and other factors that may affect our ability to collect from customers.

Property and Equipment

Property and equipment, which includes amounts recorded under capital leases, are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets or the remaining lease term, whichever is shorter.

The estimated useful lives of property and equipment are described below:



Property and Equipment		Useful Life
Network equipment		Three to 25 years
Buildings		Three to 30 years
Computer software, office equipment and other		Two to five years
Leased equipment and leasehold improvements		Lesser of estimated useful life or remaining lease term

Land and assets held within construction in progress are not depreciated. Construction in progress is related to the construction or development of property and equipment that have not yet been placed in service for their intended use.

The cost of maintenance and repairs is expensed as incurred. When assets are retired or otherwise disposed of, the cost and related accumulated depreciation are removed from their respective accounts, and any gain or loss on such sale or disposal is reflected in income from operations.

Lease Obligations

We enter into lease arrangements for office space, land, facilities, data centers, and equipment under non-cancelable capital and operating leases. Certain of the operating lease agreements contain rent holidays, rent escalation provisions, and purchase options. Rent holidays and rent escalation provisions are considered in determining the straight-line rent expense to be recorded over the lease term. The lease term begins on the date of initial possession of the leased property for purposes of recognizing lease expense on a straight-line basis over the term of the lease. We do not assume renewals in our determination of the lease term unless the renewals are deemed to be reasonably assured at lease inception.

We record assets and liabilities for the estimated construction costs incurred by third parties under build-to-suit lease arrangements to the extent that we are involved in the construction of structural improvements or bear construction risk prior to commencement of a lease. As of December 31, 2018, we completed our build-to-suit lease arrangements and properly derecognized the associated assets on our consolidated balance sheet.

Loss Contingencies

We are involved in legal proceedings, claims, and regulatory, tax or government inquiries and investigations that arise in the ordinary course of business. Certain of these matters include speculative claims for substantial or indeterminate amounts of damages. We record a liability when we believe that it is both probable that a loss has been incurred and the amount can be reasonably estimated. If we determine that a loss is reasonably possible and the loss or range of loss can be estimated, we disclose the possible loss in the notes to the consolidated financial statements.

We review the developments in our contingencies that could affect the amount of the provisions that has been previously recorded, and the matters and related possible losses disclosed. We make adjustments to our provisions and changes to our disclosures accordingly to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and updated information. Significant judgment is required to determine both the probability and the estimated amount.

Business Combinations

We allocate the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired users, acquired technology, and trade names from a market participant perspective, useful lives and discount rates. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, which is not to exceed one year from the acquisition date, we may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings.

Long-Lived Assets, Including Goodwill and Other Acquired Intangible Assets

We evaluate the recoverability of property and equipment and finite-lived intangible assets for possible impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. The evaluation is performed at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. Recoverability of these assets is measured by a comparison of the carrying amounts to the future undiscounted cash flows the assets are expected to generate. If such review indicates that the carrying amount of property and equipment and intangible assets is not recoverable, the carrying amount of such assets is reduced to fair value. We have not recorded any significant impairment charges during the years presented.

We review goodwill for impairment at least annually or more frequently if events or changes in circumstances would more likely than not reduce the fair value of our single reporting unit below its carrying value. As of December 31, 2018, no impairment of goodwill has been identified.

Acquired finite-lived intangible assets are amortized on a straight-line basis over the estimated useful lives of the assets. We routinely review the remaining estimated useful lives of property and equipment and finite-lived intangible assets. If we reduce the estimated useful life assumption for any asset, the remaining unamortized balance is amortized or depreciated over the revised estimated useful life.

Foreign Currency

Generally, the functional currency of our international subsidiaries is the local currency. We translate the financial statements of these subsidiaries to U.S. dollars using month-end rates of exchange for assets and liabilities, and average rates of exchange for revenue, costs, and expenses. Translation gains and losses are recorded in accumulated other comprehensive (loss) income as a component of stockholders' equity. As of December 31, 2018 and 2017, we had a cumulative translation loss, net of tax of $466 million and $16 million, respectively. Net losses resulting from foreign exchange transactions were $213 million, $6 million, and $76 million for the years ended December 31, 2018, 2017, and 2016, respectively. These losses were recorded as interest and other income (expense), net in our consolidated statements of income.

Credit Risk and Concentration

Our financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash, cash equivalents, restricted cash, marketable securities, and accounts receivable. The majority of cash equivalents consists of short-term money market funds, which are managed by reputable financial institutions. Marketable securities consist of investments in U.S. government securities, U.S. government agency securities, and corporate debt securities. Our investment policy limits investment instruments to U.S. government securities, U.S. government agency securities, and corporate debt securities with the main objective of preserving capital and maintaining liquidity.

Accounts receivable are typically unsecured and are derived from revenue earned from customers across different industries and countries. We generated 43%, 44%, and 46% of our revenue for the years ended December 31, 2018, 2017, and 2016, respectively, from marketers and developers based in the United States, with the majority of revenue outside of the United States coming from customers located in western Europe, China, Canada, Australia, and Brazil.

We perform ongoing credit evaluations of our customers, and generally do not require collateral. We maintain an allowance for estimated credit losses. During the years ended December 31, 2018, 2017, and 2016, our bad debt expenses were $77 million, $48 million, and $66 million, respectively. In the event that accounts receivable collection cycles deteriorate, our operating results and financial position could be adversely affected.

No customer represented 10% or more of total revenue during the years ended December 31, 2018, 2017, and 2016.

Segments

Our chief operating decision-maker is our Chief Executive Officer who makes resource allocation decisions and assesses performance based on financial information presented on a consolidated basis. There are no segment managers who are held accountable by the chief operating decision-maker, or anyone else, for operations, operating results, and planning for levels or components below the consolidated unit level. Accordingly, we have determined that we have a single reportable segment and operating segment structure.

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued Topic 606, which supersedes the revenue recognition requirements in Topic 605. We adopted Topic 606 as of January 1, 2018 using the modified retrospective transition method applied to those contracts which were not completed as of January 1, 2018. See Revenue Recognition above for further details.

In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers Other than Inventory (ASU 2016-16), which requires companies to recognize the income-tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset has been sold to an outside party. We adopted the new standard effective January 1, 2018, using the modified retrospective transition approach through a cumulative-effect adjustment to retained earnings as of the effective date, which was not material to our consolidated financial statements.

In November 2016, the FASB issued Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires companies to include amounts generally described as restricted cash and restricted cash equivalents in cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the statements of cash flows. We adopted the new standard effective January 1, 2018, using the retrospective transition approach. The reclassified restricted cash balances from investing activities to changes in cash, cash equivalents and restricted cash on the consolidated statements of cash flows were not material for all periods presented.

In January 2017, the FASB issued Accounting Standards Update No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01), which revises the definition of a business and provides new guidance in evaluating when a set of transferred assets and activities is a business. We adopted the new standard effective January 1, 2018 on a prospective basis. The new standard did not have a material impact on our consolidated financial statements.

In February 2018, the FASB issued Accounting Standards Update No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02), which allows companies to reclassify stranded tax effects resulting from the Tax Act, from accumulated other comprehensive income to retained earnings. The new standard is effective for us beginning January 1, 2019, with early adoption permitted. We elected to early adopt the new standard at the beginning of the third quarter of 2018 using the aggregate portfolio approach. The amount of stranded tax effects that were reclassified from accumulated other comprehensive loss to retained earnings was not material.

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02), as amended, which generally requires lessees to recognize operating and financing lease liabilities and corresponding right-of-use assets on the balance sheet and to provide enhanced disclosures surrounding the amount, timing and uncertainty of cash flows arising from leasing arrangements. We will adopt the new standard effective January 1, 2019 on a modified retrospective basis and will not restate comparative periods. We will elect the package of practical expedients permitted under the transition guidance, which allows us to carryforward our historical lease classification, our assessment on whether a contract is or contains a lease, and our initial direct costs for any leases that exist prior to adoption of the new standard. We will also elect to combine lease and non-lease components and to keep leases with an initial term of 12 months or less off the balance sheet and recognize the associated lease payments in the consolidated statements of income on a straight-line basis over the lease term. We estimate approximately $6 billion would be recognized as total right-of-use assets and total lease liabilities on our consolidated balance sheet as of January 1, 2019. Other than disclosed, we do not expect the new standard to have a material impact on our remaining consolidated financial statements.

In January 2017, the FASB issued Accounting Standards Update No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04), which eliminates step two from the goodwill impairment test. Under ASU 2017-04, an entity should recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value up to the amount of goodwill allocated to that reporting unit. This guidance will be effective for us in the first quarter of 2020 on a prospective basis, and early adoption is permitted. We do not expect the standard to have a material impact on our consolidated financial statements.

Fact Table
Network	2103100 - Disclosure - Earnings per Share (http://www.facebook.com/role/EarningsPerShare)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Earnings Per Share [Text Block]

Earnings per Share

We compute earnings per share (EPS) of Class A and Class B common stock using the two-class method required for participating securities. We consider restricted stock awards to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares.

Undistributed earnings allocated to participating securities are subtracted from net income in determining net income attributable to common stockholders. Basic EPS is computed by dividing net income attributable to common stockholders by the weighted-average number of shares of our Class A and Class B common stock outstanding, adjusted for outstanding shares that are subject to repurchase.

For the calculation of diluted EPS, net income attributable to common stockholders for basic EPS is adjusted by the effect of dilutive securities, such as awards under our equity compensation plans and inducement awards under separate non-plan restricted stock unit (RSU) award agreements. In addition, the computation of the diluted EPS of Class A common stock assumes the conversion of our Class B common stock to Class A common stock, while the diluted EPS of Class B common stock does not assume the conversion of those shares to Class A common stock. Diluted EPS attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding.

RSUs with anti-dilutive effect were excluded from the EPS calculation and they were not material for the years ended December 31, 2018, 2017, and 2016, respectively.

Basic and diluted EPS are the same for each class of common stock because they are entitled to the same liquidation and dividend rights.

The numerators and denominators of the basic and diluted EPS computations for our common stock are calculated as follows (in millions, except per share amounts):



	Year Ended December 31,
	2018					2017					2016
	Class A		Class B			Class A		Class B			Class A		Class B
Basic EPS:
Numerator
Net income	$	18,411	$	3,701		$	13,034	$	2,900		$	8,270	$	1,947
Less: Net income attributable to participating securities	1		—			12		2			24		5
Net income attributable to common stockholders	$	18,410	$	3,701		$	13,022	$	2,898		$	8,246	$	1,942
Denominator
Weighted average shares outstanding	2,406		484			2,375		528			2,323		548
Less: Shares subject to repurchase	—		—			2		—			6		2
Number of shares used for basic EPS computation	2,406		484			2,373		528			2,317		546
Basic EPS	$	7.65	$	7.65		$	5.49	$	5.49		$	3.56	$	3.56
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	18,410	$	3,701		$	13,022	$	2,898		$	8,246	$	1,942
Reallocation of net income attributable to participating securities	1		—			14		—			29		—
Reallocation of net income as a result of conversion of Class B to Class A common stock	3,701		—			2,898		—			1,942		—
Reallocation of net income to Class B common stock	—		(16		)	—		(13		)	—		14
Net income attributable to common stockholders for diluted EPS	$	22,112	$	3,685		$	15,934	$	2,885		$	10,217	$	1,956
Denominator
Number of shares used for basic EPS computation	2,406		484			2,373		528			2,317		546
Conversion of Class B to Class A common stock	484		—			528		—			546		—
Weighted average effect of dilutive securities:
Employee stock options	2		2			4		4			6		6
RSUs	29		1			49		3			49		5
Shares subject to repurchase and other	—		—			2		—			7		3
Number of shares used for diluted EPS computation	2,921		487			2,956		535			2,925		560
Diluted EPS	$	7.57	$	7.57		$	5.39	$	5.39		$	3.49	$	3.49

Fact Table
Network	2104100 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecurities)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Cash, Cash Equivalents, and Short-term Investments [Text Block]

Cash and Cash Equivalents, and Marketable Securities

The following table sets forth the cash and cash equivalents, and marketable securities (in millions):



	December 31,
	2018		2017
Cash and cash equivalents:
Cash	$	2,713	$	2,212
Money market funds	6,792		5,268
U.S. government securities	90		66
U.S. government agency securities	54		25
Certificate of deposits and time deposits	369		440
Corporate debt securities	1		68
Total cash and cash equivalents	10,019		8,079
Marketable securities:
U.S. government securities	13,836		12,766
U.S. government agency securities	8,333		10,944
Corporate debt securities	8,926		9,922
Total marketable securities	31,095		33,632
Total cash and cash equivalents, and marketable securities	$	41,114	$	41,711

The gross unrealized losses on our marketable securities were $357 million and $289 million as of December 31, 2018 and 2017, respectively. The gross unrealized gains for both periods were not significant. In addition, gross unrealized losses that had been in a continuous loss position for 12 months or longer were $332 million and $169 million as of December 31, 2018 and 2017, respectively. As of December 31, 2018, we considered the decreases in market value on our marketable securities to be temporary in nature and did not consider any of our investments to be other-than-temporarily impaired.

The following table classifies our marketable securities by contractual maturities (in millions):



	December 31,
	2018		2017
Due in one year	$	9,746	$	7,976
Due after one year to five years	21,349		25,656
Total	$	31,095	$	33,632

Fact Table
Network	2106100 - Disclosure - Fair Value Measurement (http://www.facebook.com/role/FairValueMeasurement)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Fair Value Disclosures [Text Block]

Fair Value Measurement

The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in millions):



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	6,792	$	6,792	$	—	$	—
U.S. government securities	90		90		—		—
U.S. government agency securities	54		54		—		—
Certificate of deposits and time deposits	369		—		369		—
Corporate debt securities	1		—		1		—
Marketable securities:
U.S. government securities	13,836		13,836		—		—
U.S. government agency securities	8,333		8,333		—		—
Corporate debt securities	8,926		—		8,926		—
Total cash equivalents and marketable securities	$	38,401	$	29,105	$	9,296	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3
Cash equivalents:
Money market funds	$	5,268	$	5,268	$	—	$	—
U.S. government securities	66		66		—		—
U.S. government agency securities	25		25		—		—
Certificate of deposits and time deposits	440		—		440		—
Corporate debt securities	68		—		68		—
Marketable securities:
U.S. government securities	12,766		12,766		—		—
U.S. government agency securities	10,944		10,944		—		—
Corporate debt securities	9,922		—		9,922		—
Total cash equivalents and marketable securities	$	39,499	$	29,069	$	10,430	$	—

We classify our cash equivalents and marketable securities within Level 1 or Level 2 because we use quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value.

Fact Table
Network	2107100 - Disclosure - Property and Equipment (http://www.facebook.com/role/PropertyAndEquipment)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Property, Plant and Equipment Disclosure [Text Block]

Property and Equipment

Property and equipment consists of the following (in millions):



	December 31,
	2018			2017
Land	$	899		$	798
Buildings	7,401			4,909
Leasehold improvements	1,841			959
Network equipment	13,017			7,998
Computer software, office equipment and other	1,187			681
Construction in progress	7,228			2,992
Total	31,573			18,337
Less: Accumulated depreciation	(6,890		)	(4,616		)
Property and equipment, net	$	24,683		$	13,721

Depreciation expense on property and equipment was $3.68 billion, $2.33 billion, and $1.59 billion during 2018, 2017, and 2016, respectively.

Property and equipment as of December 31, 2018 and 2017 includes $1.06 billion and $533 million, respectively, acquired under capital lease agreements, of which a substantial majority, is included in network equipment. Accumulated depreciation of property and equipment acquired under these capital leases was $217 million and $101 million at December 31, 2018 and 2017, respectively.

Construction in progress includes costs mostly related to construction of data centers, network equipment infrastructure to support our data centers around the world, and office buildings. The construction of office buildings as of December 31, 2017 included our build-to-suit lease arrangements which were completed and derecognized during 2018.

No interest was capitalized during the years ended December 31, 2018, 2017 and 2016.

Fact Table
Network	2108100 - Disclosure - Goodwill and Intangible Assets (http://www.facebook.com/role/GoodwillAndIntangibleAssets)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Goodwill and Intangible Assets Disclosure [Text Block]

Goodwill and Intangible Assets

During the year ended December 31, 2018, we purchased certain intangible assets and completed several business acquisitions that were not material to our consolidated financial statements, either individually or in the aggregate. Accordingly, pro forma historical results of operations related to these business acquisitions during the year ended December 31, 2018 have not been presented. We have included the financial results of these business acquisitions in our consolidated financial statements from their respective dates of acquisition.

Goodwill generated from all business acquisitions completed during the year ended December 31, 2018 was primarily attributable to expected synergies from future growth and potential monetization opportunities. The amount of goodwill generated during this period that was deductible for tax purposes was not material.

The changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 are as follows (in millions):



Balance as of December 31, 2016	$	18,122
Goodwill acquired	90
Effect of currency translation adjustment	9
Balance as of December 31, 2017	$	18,221
Goodwill acquired	88
Effect of currency translation adjustment	(8		)
Balance as of December 31, 2018	$	18,301

Intangible assets consist of the following (in millions):



		December 31, 2018							December 31, 2017
	Weighted-Average Remaining Useful Lives (in years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount

Acquired users	2.8	$	2,056	$	(1,260	)	$	796	$	2,056	$	(971	)	$	1,085
Acquired technology	1.2	1,002		(871		)	131		972		(711		)	261
Acquired patents	5.2	805		(565		)	240		785		(499		)	286
Trade names	1.4	629		(517		)	112		629		(406		)	223
Other	2.4	162		(147		)	15		162		(133		)	29
Total intangible assets	2.9	$	4,654	$	(3,360	)	$	1,294	$	4,604	$	(2,720	)	$	1,884

Amortization expense of intangible assets for the years ended December 31, 2018, 2017, and 2016 was $640 million, $692 million, and $751 million, respectively.

As of December 31, 2018, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



2019	$	553
2020	378
2021	273
2022	33
2023	26
Thereafter	31
Total	$	1,294

Fact Table
Network	2109100 - Disclosure - Liabilities (http://www.facebook.com/role/Liabilities)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

fb:AccountsPayableAccruedLiabilitiesandOtherLiabilitiesDisclosureCurrentandNoncurrentTextBlock (label)

Liabilities

The components of accrued expenses and other current liabilities are as follows (in millions):



	December 31,
	2018		2017
Accrued compensation and benefits	$	1,203	$	790
Accrued property and equipment	1,531		685
Overdraft in cash pooling entities	500		—
Accrued taxes	491		340
Other current liabilities	1,784		1,077
Accrued expenses and other current liabilities	$	5,509	$	2,892

The components of other liabilities are as follows (in millions):



	December 31,
	2018		2017
Income tax payable	$	4,655	$	5,372
Deferred tax liabilities	673		50
Other liabilities	862		995
Other liabilities	$	6,190	$	6,417

Fact Table
Network	2110100 - Disclosure - Long-term Debt (http://www.facebook.com/role/LongTermDebt)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value		Unit	Rounding	Parenthetical Explanations
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Long-term Debt [Text Block]	Long-term Debt In May 2016, we entered into a $2.0 billion senior unsecured revolving credit facility, and any amounts outstanding under this facility will be due and payable on May 20, 2021. As of December 31, 2018, no amounts had been drawn down and we were in compliance with the covenants under this facility.

Fact Table
Network	2111100 - Disclosure - Commitments and Contingencies (http://www.facebook.com/role/CommitmentsAndContingencies)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Commitments and Contingencies Disclosure [Text Block]

Commitments and Contingencies

Commitments

Leases

We have entered into various non-cancelable operating lease agreements for certain of our offices, data centers, land, and colocations with original lease periods expiring between 2019 and 2093. We are committed to pay a portion of the related actual operating expenses under certain of these lease agreements. Certain of these arrangements have free rent periods or escalating rent payment provisions, and we recognize rent expense under such arrangements on a straight-line basis.

The following is a schedule, by years, of the future minimum lease payments required under non-cancelable operating leases as of December 31, 2018 (in millions):



	Operating Leases
2019	$	698
2020	946
2021	1,055
2022	1,048
2023	1,054
Thereafter	9,850
Total minimum lease payments	$	14,651

Operating lease expense was $629 million, $363 million, and $269 million for the years ended December 31, 2018, 2017 and 2016, respectively. We fully repaid all our capital lease obligations during 2016.

Guarantee

In 2018, we established a multi-currency notional cash pool for certain of our entities with a third-party bank provider. Actual cash balances are not physically converted and are not commingled between participating legal entities. As part of the notional cash pool agreement, the bank extends overdraft credit to our participating entities as needed, provided that the overall notionally pooled balance of all accounts in the pool at the end of each day is at least zero. In the unlikely event of a default by our collective entities participating in the pool, any overdraft balances incurred would be guaranteed by Facebook, Inc.

Other contractual commitments

We also have $6.17 billion of non-cancelable contractual commitments as of December 31, 2018, primarily related to network infrastructure and our data center operations. These commitments are primarily due within five years.

Contingencies

Legal Matters

Beginning on March 20, 2018, multiple putative class actions and derivative actions were filed in state and federal courts in the United States and elsewhere against us and certain of our directors and officers alleging violations of securities laws, breach of fiduciary duties, and other causes of action in connection with our platform and user data practices as well as the misuse of certain data by a developer that shared such data with third parties in violation of our terms and policies, and seeking unspecified damages and injunctive relief. Beginning on July 27, 2018, two putative class actions were filed in federal court in the United States against us and certain of our directors and officers alleging violations of securities laws in connection with the disclosure of our earnings results for the second quarter of 2018, and seeking unspecified damages. These two actions subsequently were transferred and consolidated in the U.S. District Court for the Northern District of California with the putative securities class action described above relating to our platform and user data practices. We believe these lawsuits are without merit, and we are vigorously defending them. In addition, our platform and user data practices, as well as the events surrounding the misuse of certain data by a developer, became the subject of U.S. Federal Trade Commission, Securities and Exchange Commission, state attorneys general, and other government inquiries in the United States, Europe, and other jurisdictions.

Beginning on September 28, 2018, multiple putative class actions were filed in state and federal courts in the United States and elsewhere against us alleging violations of consumer protection laws and other causes of action in connection with a third-party cyber-attack that exploited a vulnerability in Facebook’s code to steal user access tokens and access certain profile information from user accounts on Facebook, and seeking unspecified damages and injunctive relief. We believe these lawsuits are without merit, and we are vigorously defending them. In addition, the events surrounding this cyber-attack became the subject of Irish Data Protection Commission, U.S. Federal Trade Commission and other government inquiries in the United States, Europe, and other jurisdictions.

In addition, from time to time, we are subject to litigation and other proceedings involving law enforcement and other regulatory agencies, including in particular in Brazil and Europe, in order to ascertain the precise scope of our legal obligations to comply with the requests of those agencies, including our obligation to disclose user information in particular circumstances. A number of such instances have resulted in the assessment of fines and penalties against us. We believe we have multiple legal grounds to satisfy these requests or prevail against associated fines and penalties, and we intend to vigorously defend such fines and penalties.

Although we believe that it is reasonably possible that we may incur a substantial loss in some of the cases, actions, or inquiries described above, we are currently unable to estimate the amount of such losses or a range of possible losses.

We are also party to various other legal proceedings, claims, and regulatory, tax or government inquiries and investigations that arise in the ordinary course of business. With respect to these matters, we evaluate the developments on a regular basis and accrue a liability when we believe a loss is probable and the amount can be reasonably estimated.

We believe that the amount or any estimable range of reasonably possible or probable loss will not, either individually or in the aggregate, have a material adverse effect on our business and consolidated financial statements. However, the outcome of these matters is inherently uncertain. Therefore, if one or more of these matters were resolved against us for amounts in excess of management's expectations, our results of operations and financial condition, including in a particular reporting period in which any such outcome becomes probable and estimable, could be materially adversely affected.

For information regarding income tax contingencies, see Note 12—Income Taxes.

Indemnifications

In the normal course of business, to facilitate transactions of services and products, we have agreed to indemnify certain parties with respect to certain matters. We have agreed to hold certain parties harmless against losses arising from a breach of representations or covenants, or out of intellectual property infringement or other claims made by third parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. In addition, we have entered into indemnification agreements with our officers, directors, and certain employees, and our certificate of incorporation and bylaws contain similar indemnification obligations.

It is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. Historically, payments made by us under these agreements have not had a material impact on our consolidated financial statements. In our opinion, as of December 31, 2018, there was not at least a reasonable possibility we had incurred a material loss with respect to indemnification of such parties. We have not recorded any liability for costs related to indemnification through December 31, 2018.

Fact Table
Network	2112100 - Disclosure - Stockholders' Equity (http://www.facebook.com/role/StockholdersEquity)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Shareholders' Equity and Share-based Payments [Text Block]

Stockholders' Equity

Common Stock

Our certificate of incorporation authorizes the issuance of Class A common stock and Class B common stock. As of December 31, 2018, we are authorized to issue 5,000 million shares of Class A common stock and 4,141 million shares of Class B common stock, each with a par value of $0.000006 per share. Holders of our Class A common stock and Class B common stock are entitled to dividends when, as and if, declared by our board of directors, subject to the rights of the holders of all classes of stock outstanding having priority rights to dividends. As of December 31, 2018, we have not declared any dividends and our credit facility contains restrictions on our ability to pay dividends. The holder of each share of Class A common stock is entitled to one vote, while the holder of each share of Class B common stock is entitled to ten votes. Shares of our Class B common stock are convertible into an equivalent number of shares of our Class A common stock and generally convert into shares of our Class A common stock upon transfer. Class A common stock and Class B common stock are referred to as common stock throughout the notes to these financial statements, unless otherwise noted.

As of December 31, 2018, there were 2,385 million shares and 469 million shares of Class A common stock and Class B common stock, respectively, issued and outstanding.

Share Repurchase Program

Our board of directors has authorized a share repurchase program that commenced in 2017 and does not have an expiration date. During the second quarter of 2018, we completed repurchases under the original authorization to purchase up to $6.0 billion of our Class A common stock. In April 2018, the authorization for the repurchase of our Class A common stock was increased by an additional $9.0 billion, and we completed repurchases under this authorization during the fourth quarter of 2018. During the year ended December 31, 2018, we repurchased and subsequently retired 79 million shares of our Class A common stock for $12.93 billion.

In December 2018, our board of directors authorized an additional $9.0 billion of repurchases under this program. The timing and actual number of shares repurchased under this program depend on a variety of factors, including price, general business and market conditions, and other investment opportunities, and shares may be repurchased through open market purchases or privately negotiated transactions, including through the use of trading plans intended to qualify under Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. As of December 31, 2018, $9.0 billion remained available and authorized for repurchases.

Share-based Compensation Plans

We maintain two share-based employee compensation plans: the 2012 Equity Incentive Plan, which was amended in each of June 2016 and February 2018 (Amended 2012 Plan), and the 2005 Stock Plan (collectively, Stock Plans). Our Amended 2012 Plan serves as the successor to our 2005 Stock Plan and provides for the issuance of incentive and nonstatutory stock options, restricted stock awards, stock appreciation rights, RSUs, performance shares, and stock bonuses to qualified employees, directors and consultants. Outstanding awards under the 2005 Stock Plan continue to be subject to the terms and conditions of the 2005 Stock Plan. Shares that are withheld in connection with the net settlement of RSUs or forfeited under our Stock Plans are added to the reserves of the Amended 2012 Plan. We account for forfeitures as they occur.

As of December 31, 2018, there were 83 million shares reserved for future issuance under our Amended 2012 Plan. The number of shares reserved for issuance under our Amended 2012 Plan increases automatically on January 1 of each of the calendar years during the term of the Amended 2012 Plan, which will continue through April 2026 unless terminated earlier by our board of directors or a committee thereof, by a number of shares of Class A common stock equal to the lesser of (i) 2.5% of the total issued and outstanding shares of our Class A common stock as of the immediately preceding December 31st or (ii) a number of shares determined by our board of directors. Pursuant to this automatic increase provision, our board of directors approved an increase of 60 million shares reserved for issuance effective January 1, 2019.

The following table summarizes the activities of stock option awards under the Stock Plans for the year ended December 31, 2018:



	Shares Subject to Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value⁽¹⁾
	(in thousands)				(in years)	(in millions)
Balance as of December 31, 2017	3,078		$	10.06
Stock options exercised	(1,941	)	$	7.90
Balances at December 31, 2018	1,137		$	13.74	1.7	$	133
Stock options exercisable as of December 31, 2018	1,137		$	13.74	1.7	$	133


(1)	The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the official closing price of our Class A common stock of $131.09, as reported on the Nasdaq Global Select Market on December 31, 2018.

There were no options granted, forfeited, or canceled for the year ended December 31, 2018. The aggregate intrinsic value of the options exercised in the years ended December 31, 2018, 2017, and 2016 was $315 million, $359 million, and $309 million, respectively. The total grant date fair value of stock options vested during the years ended December 31, 2018, 2017, and 2016 was not material.

The following table summarizes the activities for our unvested RSUs for the year ended December 31, 2018:



	Unvested RSUs⁽¹⁾
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2017	81,214		$	110.49
Granted	38,283		$	168.38
Vested	(43,396	)	$	106.59
Forfeited	(8,803	)	$	119.25
Unvested at December 31, 2018	67,298		$	144.77


(1)	Unvested shares at December 31, 2017 included an inducement award issued in connection with the WhatsApp acquisition in 2014, which was subject to the terms, restrictions, and conditions of a separate non-plan RSU award agreement. This inducement award was no longer outstanding as of December 31, 2018.

The fair value as of the respective vesting dates of RSUs that vested during the years ended December 31, 2018, 2017, and 2016 was $7.57 billion, $6.76 billion, and $4.92 billion, respectively.

As of December 31, 2018, there was $8.96 billion of unrecognized share-based compensation expense, which was related to RSUs. This unrecognized compensation expense is expected to be recognized over a weighted-average period of approximately three years based on vesting under the award service conditions.

Fact Table
Network	2113100 - Disclosure - Interest and other income (expense), net (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNet)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Other Nonoperating Income and Expense [Text Block]

Interest and other income (expense), net

The following table presents the detail of interest and other income (expense), net, for the periods presented (in millions):



	Year Ended December 31,
	2018			2017			2016
Interest income	$	661		$	398		$	176
Interest expense	(9		)	(6		)	(10		)
Foreign currency exchange losses, net	(213		)	(6		)	(76		)
Other	9			5			1
Interest and other income (expense), net	$	448		$	391		$	91

Fact Table
Network	2114100 - Disclosure - Income Taxes (http://www.facebook.com/role/IncomeTaxes)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Income Tax Disclosure [Text Block]

Income Taxes

The components of income before provision for income taxes for the years ended December 31, 2018, 2017, and 2016 are as follows (in millions):



	Year Ended December 31,
	2018		2017		2016
Domestic	$	8,800	$	7,079	$	6,368
Foreign	16,561		13,515		6,150
Income before provision for income taxes	$	25,361	$	20,594	$	12,518

The provision for income taxes consisted of the following (in millions):



	Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	1,747		$	4,455		$	2,384
State	176			190			179
Foreign	1,031			389			195
Total current tax expense	2,954			5,034			2,758
Deferred:
Federal	316			(296		)	(414		)
State	34			(33		)	(18		)
Foreign	(55		)	(45		)	(25		)
Total deferred tax expense/(benefits)	295			(374		)	(457		)
Provision for income taxes	$	3,249		$	4,660		$	2,301

A reconciliation of the U.S. federal statutory income tax rate of 21.0% to our effective tax rate is as follows (in percentages):



	Year Ended December 31,
	2018		2017		2016
U.S. federal statutory income tax rate	21.0	%	35.0	%	35.0	%
State income taxes, net of federal benefit	0.7		0.6		1.0
Research tax credits	(1.0	)	(0.9	)	(0.7	)
Share-based compensation	0.3		0.4		1.0
Excess tax benefits related to share-based compensation	(2.6	)	(5.8	)	(7.0	)
Effect of non-U.S. operations	(5.9	)	(18.6	)	(12.8	)
Effect of U.S. tax law change ⁽¹⁾	—		11.0		—
Other	0.3		0.9		1.9
Effective tax rate	12.8	%	22.6	%	18.4	%


(1)	Due to the Tax Act which was enacted in December 2017, provisional one-time mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. In addition, deferred taxes were derecognized for previous estimated tax liabilities that would arise upon repatriation of a portion of these earnings in the foreign jurisdictions.

Our deferred tax assets (liabilities) are as follows (in millions):



	December 31,
	2018			2017
Deferred tax assets:
Net operating loss carryforward	$	1,825		$	1,300
Tax credit carryforward	668			509
Share-based compensation	270			385
Accrued expenses and other liabilities	487			381
Other	153			131
Total deferred tax assets	3,403			2,706
Less: valuation allowance	(600		)	(438		)
Deferred tax assets, net of valuation allowance	2,803			2,268

Deferred tax liabilities:
Depreciation and amortization	(1,401		)	(622		)
Purchased intangible assets	(195		)	(309		)
Deferred taxes on foreign income	—			(88		)
Total deferred tax liabilities	(1,596		)	(1,019		)
Net deferred tax assets	$	1,207		$	1,249

The Tax Act reduces the U.S. statutory corporate tax rate from 35% to 21% for our tax years beginning in 2018, which resulted in the re-measurement of the federal portion of our deferred tax assets as of December 31, 2017 from the 35% to 21% tax rate. The valuation allowance was approximately $600 million and $438 million as of December 31, 2018 and 2017, respectively, mostly related to state tax credits that we do not believe will ultimately be realized.

In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which allowed us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. As a result, we previously provided a provisional estimate of the effect of the Tax Act in our financial statements. In the fourth quarter of 2018, we completed our analysis to determine the effect of the Tax Act and recorded immaterial adjustments as of December 31, 2018.

As of December 31, 2018, the U.S. federal and state net operating loss carryforwards were $7.88 billion and $2.22 billion, which will begin to expire in 2033 and 2032, respectively, if not utilized. We have federal tax credit carryforwards of $290 million, which will begin to expire in 2033, if not utilized, and state tax credit carryforwards of $1.91 billion, most of which do not expire.

Utilization of our net operating loss and tax credit carryforwards may be subject to substantial annual limitations due to the ownership change limitations provided by the Internal Revenue Code and similar state provisions. Such annual limitations could result in the expiration of the net operating loss and tax credit carryforwards before their utilization. The events that may cause ownership changes include, but are not limited to, a cumulative stock ownership change of greater than 50% over a three-year period.

The Tax Act imposes a mandatory transition tax on accumulated foreign earnings and generally eliminates US taxes on foreign subsidiary distribution. As a result, earnings in foreign jurisdictions are available for distribution to the U.S. without incremental U.S. taxes.

The following table reflects changes in the gross unrecognized tax benefits (in millions):



	Year Ended December 31,
	2018			2017			2016
Gross unrecognized tax benefits-beginning of period	$	3,870		$	3,309		$	3,017
Increases related to prior year tax positions	457			72			32
Decreases related to prior year tax positions	(396		)	(34		)	(36		)
Increases related to current year tax positions	831			536			307
Decreases related to settlements of prior year tax positions	(84		)	(13		)	(11		)
Gross unrecognized tax benefits-end of period	$	4,678		$	3,870		$	3,309

During all years presented, we recognized interest and penalties related to unrecognized tax benefits within the provision for income taxes on the consolidated statements of income. The amount of interest and penalties accrued as of December 31, 2018 and 2017 was $340 million and $154 million, respectively.

If the balance of gross unrecognized tax benefits of $4.68 billion as of December 31, 2018 were realized in a future period, this would result in a tax benefit of $2.94 billion within our provision of income taxes at such time.

On July 27, 2015, the United States Tax Court (Tax Court) issued an opinion in Altera Corp. v. Commissioner (Tax Court Opinion), which concluded that related parties in a cost sharing arrangement are not required to share expenses related to share-based compensation. The Tax Court Opinion was appealed by the Commissioner to the Ninth Circuit Court of Appeals (Ninth Circuit). On July 24, 2018, the Ninth Circuit issued an opinion (Ninth Circuit Opinion) that reversed the Tax Court Opinion. The Ninth Circuit Opinion was subsequently withdrawn and the case is being reheard. Since the Ninth Circuit Opinion was withdrawn, we continue to treat our share-based compensation expense in accordance with the Tax Court Opinion. We also continue to monitor developments in this case and any impact the final opinion could have on our consolidated financial statements.

We are subject to taxation in the United States and various other state and foreign jurisdictions. The material jurisdictions in which we are subject to potential examination include the United States and Ireland. We are under examination by the Internal Revenue Service (IRS) for our 2014 through 2016 tax years and by the Ireland tax authorities for our 2012 through 2015 tax years. Our 2017 tax year remains open to examination by the IRS. Our 2016 and subsequent tax years remain open to examination in Ireland.

In July 2016, we received a Statutory Notice of Deficiency (Notice) from the IRS related to transfer pricing with our foreign subsidiaries in conjunction with the examination of the 2010 tax year. While the Notice applies only to the 2010 tax year, the IRS states that it will also apply its position for tax years subsequent to 2010, which, if the IRS prevails in its position, could result in an additional federal tax liability of an estimated, aggregate amount of approximately up to $5.0 billion in excess of the amounts in our originally filed U.S. return, plus interest and any penalties asserted. We do not agree with the position of the IRS and have filed a petition in the Tax Court challenging the Notice. As of December 31, 2018, we have not resolved this matter, and proceedings continue in the Tax Court. In March 2018, we received a second Notice from the IRS in conjunction with the examination of our 2011 through 2013 tax years. The IRS applied its position from the 2010 tax year to each of these years and also proposed new adjustments related to other transfer pricing with our foreign subsidiaries and certain tax credits that we claimed. If the IRS prevails in its position for these new adjustments, this could result in an additional federal tax liability of up to approximately $680 million in excess of the amounts in our originally filed U.S. return, plus interest and any penalties asserted. We do not agree with the positions of the IRS in the second Notice and have filed a petition in the Tax Court challenging the second Notice. We have previously accrued an estimated unrecognized tax benefit consistent with the guidance in ASC 740 that is lower than the potential additional federal tax liability from the positions taken by the IRS in the two Notices. In addition, if the IRS prevails in its positions related to transfer pricing with our foreign subsidiaries, the additional tax that we would owe would be partially offset by a reduction in the tax that we owe under the mandatory transition tax on accumulated foreign earnings from the Tax Act.

We believe that adequate amounts have been reserved in accordance with ASC 740 for any adjustments to the provision for income taxes or other tax items that may ultimately result from these examinations. The timing of the resolution, settlement, and closure of any audits is highly uncertain, and it is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. Given the number of years remaining that are subject to examination, we are unable to estimate the full range of possible adjustments to the balance of gross unrecognized tax benefits. If the taxing authorities prevail in the assessment of additional tax due, the assessed tax, interest, and penalties, if any, could have a material adverse impact on our financial position, results of operations, and cash flows.

Fact Table
Network	2115100 - Disclosure - Geographical Information (http://www.facebook.com/role/GeographicalInformation)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Segment Reporting Disclosure [Text Block]

Geographical Information

The following table sets forth property and equipment, net by geographic area (in millions):



	December 31,
	2018		2017
Property and equipment, net:
United States	$	18,950	$	10,406
Rest of the world⁽¹⁾	5,733		3,315
Total property and equipment, net	$	24,683	$	13,721

(1) No individual country, other than disclosed above, exceeded 10% of our total property and equipment, net for any period presented.

For information regarding revenue disaggregated by geography, see Note 1—Summary of Significant Accounting Policies, Revenue Recognition.

Fact Table
Network	2201201 - Disclosure - Summary of Significant Accounting Policies (Policies) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesPolicies)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

fb:CashAndCashEquivalentsAndMarketableSecuritiesPolicyTextBlock (label)

Cash and Cash Equivalents, Marketable Securities, and Restricted Cash

Cash and cash equivalents primarily consist of cash on deposit with banks and investments in money market funds with maturities of 90 days or less from the date of purchase.

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

fb:LongLivedAssetsIncludingGoodwillAndIntangiblePolicyTextBlock (label)

Long-Lived Assets, Including Goodwill and Other Acquired Intangible Assets

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block]

Advertising Expense

Advertising costs are expensed when incurred and are included in marketing and sales expenses in the accompanying consolidated statements of income.

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Business Combinations Policy [Policy Text Block]

Business Combinations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Commitments and Contingencies, Policy [Policy Text Block]

Loss Contingencies

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Credit Risk and Concentration

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Level 1-Quoted prices in active markets for identical assets or liabilities.

Level 3-Inputs that are generally unobservable and typically reflect management's estimate of assumptions that market participants would use in pricing the asset or liability.

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Income Tax, Policy [Policy Text Block]

Income Taxes

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Lessee, Leases [Policy Text Block]

Lease Obligations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Pronouncements

Recent Accounting Pronouncements Not Yet Adopted

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment

The estimated useful lives of property and equipment are described below:



Property and Equipment		Useful Life
Network equipment		Three to 25 years
Buildings		Three to 30 years
Computer software, office equipment and other		Two to five years
Leased equipment and leasehold improvements		Lesser of estimated useful life or remaining lease term

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Revenue from Contract with Customer [Policy Text Block]

We determine revenue recognition through the following steps:


•	identification of the contract, or contracts, with a customer;


•	identification of the performance obligations in the contract;


•	determination of the transaction price;


•	allocation of the transaction price to the performance obligations in the contract; and


•	recognition of revenue when, or as, we satisfy a performance obligation.

Revenue excludes sales and usage-based taxes where it has been determined that we are acting as a pass-through agent.

Advertising

Payments and Other Fees

Payments revenue is comprised of the net fee we receive from developers using our Payments infrastructure.

Other fees revenue consists primarily of revenue from the delivery of consumer hardware devices, as well as revenue from various other sources.

Deferred Revenue and Deposits

Deferred revenue and deposits consists of the following (in millions):



	December 31,
	2018		2017
Deferred revenue	$	117	$	68
Deposits	30		30
Total deferred revenue and deposits	$	147	$	98

Practical Expedients and Exemptions

Cost of Revenue

Content acquisition costs

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Segment Reporting, Policy [Policy Text Block]

Segments

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Trade and Other Accounts Receivable, Policy [Policy Text Block]

Accounts Receivable and Allowances

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

Fact Table
Network	2301302 - Disclosure - Summary of Significant Accounting Policies (Tables) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

fb:PropertyPlantAndEqiupmentUsefulLifeTableTextBlock (label)

The estimated useful lives of property and equipment are described below:



Property and Equipment		Useful Life
Network equipment		Three to 25 years
Buildings		Three to 30 years
Computer software, office equipment and other		Two to five years
Leased equipment and leasehold improvements		Lesser of estimated useful life or remaining lease term

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Contract with Customer, Asset and Liability [Table Text Block]

Deferred revenue and deposits consists of the following (in millions):



	December 31,
	2018		2017
Deferred revenue	$	117	$	68
Deposits	30		30
Total deferred revenue and deposits	$	147	$	98

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Disaggregation of Revenue [Table Text Block]

Revenue disaggregated by revenue source for the years ended December 31, 2018, 2017 and 2016 consists of the following (in millions):



	Year Ended December 31,
	2018		2017⁽¹⁾		2016 ⁽¹⁾
Advertising	$	55,013	$	39,942	$	26,885
Payments and other fees	825		711		753
Total revenue	$	55,838	$	40,653	$	27,638

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

Revenue disaggregated by geography, based on the billing address of our customer, consists of the following (in millions):



	Year Ended December 31,
	2018		2017⁽¹⁾		2016 ⁽¹⁾
Revenue:
US & Canada⁽²⁾	$	25,727	$	19,065	$	13,432
Europe⁽³⁾	13,631		10,126		6,792
Asia-Pacific	11,733		7,921		5,037
Rest of World⁽³⁾	4,747		3,541		2,377
Total revenue	$	55,838	$	40,653	$	27,638

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

^{(2) United States revenue was}^{$24.10 billion}^,^{$17.73 billion}^{, and}^{$12.58 billion}^{for the}^{years ended}^{December 31, 2018}^,²⁰¹⁷^{, and}²⁰¹⁶^.

^{(3) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

Fact Table
Network	2303301 - Disclosure - Earnings per Share (Tables) (http://www.facebook.com/role/EarningsPerShareTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The numerators and denominators of the basic and diluted EPS computations for our common stock are calculated as follows (in millions, except per share amounts):



	Year Ended December 31,
	2018					2017					2016
	Class A		Class B			Class A		Class B			Class A		Class B
Basic EPS:
Numerator
Net income	$	18,411	$	3,701		$	13,034	$	2,900		$	8,270	$	1,947
Less: Net income attributable to participating securities	1		—			12		2			24		5
Net income attributable to common stockholders	$	18,410	$	3,701		$	13,022	$	2,898		$	8,246	$	1,942
Denominator
Weighted average shares outstanding	2,406		484			2,375		528			2,323		548
Less: Shares subject to repurchase	—		—			2		—			6		2
Number of shares used for basic EPS computation	2,406		484			2,373		528			2,317		546
Basic EPS	$	7.65	$	7.65		$	5.49	$	5.49		$	3.56	$	3.56
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	18,410	$	3,701		$	13,022	$	2,898		$	8,246	$	1,942
Reallocation of net income attributable to participating securities	1		—			14		—			29		—
Reallocation of net income as a result of conversion of Class B to Class A common stock	3,701		—			2,898		—			1,942		—
Reallocation of net income to Class B common stock	—		(16		)	—		(13		)	—		14
Net income attributable to common stockholders for diluted EPS	$	22,112	$	3,685		$	15,934	$	2,885		$	10,217	$	1,956
Denominator
Number of shares used for basic EPS computation	2,406		484			2,373		528			2,317		546
Conversion of Class B to Class A common stock	484		—			528		—			546		—
Weighted average effect of dilutive securities:
Employee stock options	2		2			4		4			6		6
RSUs	29		1			49		3			49		5
Shares subject to repurchase and other	—		—			2		—			7		3
Number of shares used for diluted EPS computation	2,921		487			2,956		535			2,925		560
Diluted EPS	$	7.57	$	7.57		$	5.39	$	5.39		$	3.49	$	3.49

Fact Table
Network	2304301 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Tables) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Investments Classified by Contractual Maturity Date [Table Text Block]

The following table classifies our marketable securities by contractual maturities (in millions):



	December 31,
	2018		2017
Due in one year	$	9,746	$	7,976
Due after one year to five years	21,349		25,656
Total	$	31,095	$	33,632

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Cash, Cash Equivalents and Investments [Table Text Block]

The following table sets forth the cash and cash equivalents, and marketable securities (in millions):



	December 31,
	2018		2017
Cash and cash equivalents:
Cash	$	2,713	$	2,212
Money market funds	6,792		5,268
U.S. government securities	90		66
U.S. government agency securities	54		25
Certificate of deposits and time deposits	369		440
Corporate debt securities	1		68
Total cash and cash equivalents	10,019		8,079
Marketable securities:
U.S. government securities	13,836		12,766
U.S. government agency securities	8,333		10,944
Corporate debt securities	8,926		9,922
Total marketable securities	31,095		33,632
Total cash and cash equivalents, and marketable securities	$	41,114	$	41,711

Fact Table
Network	2306301 - Disclosure - Fair Value Measurement (Tables) (http://www.facebook.com/role/FairValueMeasurementTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in millions):



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	6,792	$	6,792	$	—	$	—
U.S. government securities	90		90		—		—
U.S. government agency securities	54		54		—		—
Certificate of deposits and time deposits	369		—		369		—
Corporate debt securities	1		—		1		—
Marketable securities:
U.S. government securities	13,836		13,836		—		—
U.S. government agency securities	8,333		8,333		—		—
Corporate debt securities	8,926		—		8,926		—
Total cash equivalents and marketable securities	$	38,401	$	29,105	$	9,296	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3
Cash equivalents:
Money market funds	$	5,268	$	5,268	$	—	$	—
U.S. government securities	66		66		—		—
U.S. government agency securities	25		25		—		—
Certificate of deposits and time deposits	440		—		440		—
Corporate debt securities	68		—		68		—
Marketable securities:
U.S. government securities	12,766		12,766		—		—
U.S. government agency securities	10,944		10,944		—		—
Corporate debt securities	9,922		—		9,922		—
Total cash equivalents and marketable securities	$	39,499	$	29,069	$	10,430	$	—

Fact Table
Network	2307301 - Disclosure - Property and Equipment (Tables) (http://www.facebook.com/role/PropertyAndEquipmentTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Property, Plant and Equipment [Table Text Block]

Property and equipment consists of the following (in millions):



	December 31,
	2018			2017
Land	$	899		$	798
Buildings	7,401			4,909
Leasehold improvements	1,841			959
Network equipment	13,017			7,998
Computer software, office equipment and other	1,187			681
Construction in progress	7,228			2,992
Total	31,573			18,337
Less: Accumulated depreciation	(6,890		)	(4,616		)
Property and equipment, net	$	24,683		$	13,721

Fact Table
Network	2308301 - Disclosure - Goodwill and Intangible Assets (Tables) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Finite-Lived Intangible Assets [Table Text Block]

Intangible assets consist of the following (in millions):



		December 31, 2018							December 31, 2017
	Weighted-Average Remaining Useful Lives (in years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount

Acquired users	2.8	$	2,056	$	(1,260	)	$	796	$	2,056	$	(971	)	$	1,085
Acquired technology	1.2	1,002		(871		)	131		972		(711		)	261
Acquired patents	5.2	805		(565		)	240		785		(499		)	286
Trade names	1.4	629		(517		)	112		629		(406		)	223
Other	2.4	162		(147		)	15		162		(133		)	29
Total intangible assets	2.9	$	4,654	$	(3,360	)	$	1,294	$	4,604	$	(2,720	)	$	1,884

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Goodwill [Table Text Block]

The changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 are as follows (in millions):



Balance as of December 31, 2016	$	18,122
Goodwill acquired	90
Effect of currency translation adjustment	9
Balance as of December 31, 2017	$	18,221
Goodwill acquired	88
Effect of currency translation adjustment	(8		)
Balance as of December 31, 2018	$	18,301

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

As of December 31, 2018, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



2019	$	553
2020	378
2021	273
2022	33
2023	26
Thereafter	31
Total	$	1,294

Fact Table
Network	2309301 - Disclosure - Liabilities (Tables) (http://www.facebook.com/role/LiabilitiesTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Other Liabilities [Table Text Block]

The components of other liabilities are as follows (in millions):



	December 31,
	2018		2017
Income tax payable	$	4,655	$	5,372
Deferred tax liabilities	673		50
Other liabilities	862		995
Other liabilities	$	6,190	$	6,417

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Accrued Liabilities [Table Text Block]

The components of accrued expenses and other current liabilities are as follows (in millions):



	December 31,
	2018		2017
Accrued compensation and benefits	$	1,203	$	790
Accrued property and equipment	1,531		685
Overdraft in cash pooling entities	500		—
Accrued taxes	491		340
Other current liabilities	1,784		1,077
Accrued expenses and other current liabilities	$	5,509	$	2,892

Fact Table
Network	2311301 - Disclosure - Commitments and Contingencies (Tables) (http://www.facebook.com/role/CommitmentsAndContingenciesTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

The following is a schedule, by years, of the future minimum lease payments required under non-cancelable operating leases as of December 31, 2018 (in millions):



	Operating Leases
2019	$	698
2020	946
2021	1,055
2022	1,048
2023	1,054
Thereafter	9,850
Total minimum lease payments	$	14,651

Fact Table
Network	2312301 - Disclosure - Stockholders' Equity (Tables) (http://www.facebook.com/role/StockholdersEquityTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following table summarizes the activities for our unvested RSUs for the year ended December 31, 2018:



	Unvested RSUs⁽¹⁾
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2017	81,214		$	110.49
Granted	38,283		$	168.38
Vested	(43,396	)	$	106.59
Forfeited	(8,803	)	$	119.25
Unvested at December 31, 2018	67,298		$	144.77


(1)	Unvested shares at December 31, 2017 included an inducement award issued in connection with the WhatsApp acquisition in 2014, which was subject to the terms, restrictions, and conditions of a separate non-plan RSU award agreement. This inducement award was no longer outstanding as of December 31, 2018.

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes the activities of stock option awards under the Stock Plans for the year ended December 31, 2018:



	Shares Subject to Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value⁽¹⁾
	(in thousands)				(in years)	(in millions)
Balance as of December 31, 2017	3,078		$	10.06
Stock options exercised	(1,941	)	$	7.90
Balances at December 31, 2018	1,137		$	13.74	1.7	$	133
Stock options exercisable as of December 31, 2018	1,137		$	13.74	1.7	$	133


(1)	The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the official closing price of our Class A common stock of $131.09, as reported on the Nasdaq Global Select Market on December 31, 2018.

Fact Table
Network	2313301 - Disclosure - Interest and other income (expense), net (Tables) (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNetTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

The following table presents the detail of interest and other income (expense), net, for the periods presented (in millions):



	Year Ended December 31,
	2018			2017			2016
Interest income	$	661		$	398		$	176
Interest expense	(9		)	(6		)	(10		)
Foreign currency exchange losses, net	(213		)	(6		)	(76		)
Other	9			5			1
Interest and other income (expense), net	$	448		$	391		$	91

Fact Table
Network	2314301 - Disclosure - Income Taxes (Tables) (http://www.facebook.com/role/IncomeTaxesTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes consisted of the following (in millions):



	Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	1,747		$	4,455		$	2,384
State	176			190			179
Foreign	1,031			389			195
Total current tax expense	2,954			5,034			2,758
Deferred:
Federal	316			(296		)	(414		)
State	34			(33		)	(18		)
Foreign	(55		)	(45		)	(25		)
Total deferred tax expense/(benefits)	295			(374		)	(457		)
Provision for income taxes	$	3,249		$	4,660		$	2,301

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Our deferred tax assets (liabilities) are as follows (in millions):



	December 31,
	2018			2017
Deferred tax assets:
Net operating loss carryforward	$	1,825		$	1,300
Tax credit carryforward	668			509
Share-based compensation	270			385
Accrued expenses and other liabilities	487			381
Other	153			131
Total deferred tax assets	3,403			2,706
Less: valuation allowance	(600		)	(438		)
Deferred tax assets, net of valuation allowance	2,803			2,268

Deferred tax liabilities:
Depreciation and amortization	(1,401		)	(622		)
Purchased intangible assets	(195		)	(309		)
Deferred taxes on foreign income	—			(88		)
Total deferred tax liabilities	(1,596		)	(1,019		)
Net deferred tax assets	$	1,207		$	1,249

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the U.S. federal statutory income tax rate of 21.0% to our effective tax rate is as follows (in percentages):



	Year Ended December 31,
	2018		2017		2016
U.S. federal statutory income tax rate	21.0	%	35.0	%	35.0	%
State income taxes, net of federal benefit	0.7		0.6		1.0
Research tax credits	(1.0	)	(0.9	)	(0.7	)
Share-based compensation	0.3		0.4		1.0
Excess tax benefits related to share-based compensation	(2.6	)	(5.8	)	(7.0	)
Effect of non-U.S. operations	(5.9	)	(18.6	)	(12.8	)
Effect of U.S. tax law change ⁽¹⁾	—		11.0		—
Other	0.3		0.9		1.9
Effective tax rate	12.8	%	22.6	%	18.4	%


(1)	Due to the Tax Act which was enacted in December 2017, provisional one-time mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. In addition, deferred taxes were derecognized for previous estimated tax liabilities that would arise upon repatriation of a portion of these earnings in the foreign jurisdictions.

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The components of income before provision for income taxes for the years ended December 31, 2018, 2017, and 2016 are as follows (in millions):



	Year Ended December 31,
	2018		2017		2016
Domestic	$	8,800	$	7,079	$	6,368
Foreign	16,561		13,515		6,150
Income before provision for income taxes	$	25,361	$	20,594	$	12,518

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

The following table reflects changes in the gross unrecognized tax benefits (in millions):



	Year Ended December 31,
	2018			2017			2016
Gross unrecognized tax benefits-beginning of period	$	3,870		$	3,309		$	3,017
Increases related to prior year tax positions	457			72			32
Decreases related to prior year tax positions	(396		)	(34		)	(36		)
Increases related to current year tax positions	831			536			307
Decreases related to settlements of prior year tax positions	(84		)	(13		)	(11		)
Gross unrecognized tax benefits-end of period	$	4,678		$	3,870		$	3,309

Fact Table
Network	2315301 - Disclosure - Geographical Information (Tables) (http://www.facebook.com/role/GeographicalInformationTables)
Table	(implied)

Reporting Entity [Axis]

Period [Axis]

Concept

Fact Value

Unit

Rounding

Parenthetical Explanations

0001326801 (http://www.sec.gov/CIK)

2018-01-01 to 2018-12-31

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

The following table sets forth property and equipment, net by geographic area (in millions):



	December 31,
	2018		2017
Property and equipment, net:
United States	$	18,950	$	10,406
Rest of the world⁽¹⁾	5,733		3,315
Total property and equipment, net	$	24,683	$	13,721

(1) No individual country, other than disclosed above, exceeded 10% of our total property and equipment, net for any period presented.

Fact Table
Network	2401403 - Disclosure - Summary of Significant Accounting Policies - Disaggregated Revenue (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesDisaggregatedRevenueDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	UNITED STATES	Concentration Risk, Percentage	0.46	xbrli:pure	2
2	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.46	xbrli:pure	2
3	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.46	xbrli:pure	2
4	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	UNITED STATES	Concentration Risk, Percentage	0.44	xbrli:pure	2
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.44	xbrli:pure	2
6	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.44	xbrli:pure	2
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	UNITED STATES	Concentration Risk, Percentage	0.43	xbrli:pure	2
8	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.43	xbrli:pure	2
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.43	xbrli:pure	2
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Product and Service [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	fb:PaymentsandOtherFeesMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	753000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Advertising [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	26885000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	12580000000	iso4217:USD	-7
17	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	fb:RestOfWorldMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	2377000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	fb:USCanadaMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	13432000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Asia Pacific [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	5037000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Europe [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	6792000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Product and Service [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	fb:PaymentsandOtherFeesMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	711000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Advertising [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	39942000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	17730000000	iso4217:USD	-7
28	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	fb:RestOfWorldMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	3541000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	fb:USCanadaMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	19065000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Asia Pacific [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	7921000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Europe [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	10126000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Product and Service [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:PaymentsandOtherFeesMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	825000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Advertising [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	55013000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	24100000000	iso4217:USD	-7
39	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:RestOfWorldMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	4747000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:USCanadaMember (label)	Revenue from Contract with Customer, Excluding Assessed Tax	25727000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Asia Pacific [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	11733000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Europe [Member]	Revenue from Contract with Customer, Excluding Assessed Tax	13631000000	iso4217:USD	-6

Fact Table
Network	2401404 - Disclosure - Summary of Significant Accounting Policies - Deferred Revenue and Deposits (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesDeferredRevenueAndDepositsDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	fb:ContractWithCustomerDepositsUnusedBalances (label)	30000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	fb:ContractWithCustomerDepositsUnusedBalances (label)	30000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	fb:ContractWithCustomerLiabilityandUnusedDeposits (label)	98000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	fb:ContractWithCustomerLiabilityandUnusedDeposits (label)	147000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Contract with Customer, Liability	68000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Contract with Customer, Liability	117000000	iso4217:USD	-6

Fact Table
Network	2401405 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) (http://www.facebook.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
4	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	fb:RevenueRemainingPerformanceObligationAmountPayablePercentage (label)	0.7	xbrli:pure	2
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Range [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Geographical [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Type of Adoption [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Concentration Risk Benchmark [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Concentration Risk Type [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Property, Plant and Equipment, Type [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Scenario, Unspecified [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-16000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Geographical [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Type of Adoption [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Concentration Risk Benchmark [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Concentration Risk Type [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Property, Plant and Equipment, Type [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Scenario, Unspecified [Domain]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-466000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Advertising Expense	310000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographical [Domain]	Advertising Expense	310000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Type of Adoption [Domain]	Advertising Expense	310000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Benchmark [Domain]	Advertising Expense	310000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Type [Domain]	Advertising Expense	310000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Property, Plant and Equipment, Type [Domain]	Advertising Expense	310000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Scenario, Unspecified [Domain]	Advertising Expense	310000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Advertising Expense	324000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographical [Domain]	Advertising Expense	324000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Type of Adoption [Domain]	Advertising Expense	324000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Benchmark [Domain]	Advertising Expense	324000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Type [Domain]	Advertising Expense	324000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Property, Plant and Equipment, Type [Domain]	Advertising Expense	324000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Scenario, Unspecified [Domain]	Advertising Expense	324000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
37	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
38	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
39	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
40	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
41	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
42	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Advertising Expense	1100000000	iso4217:USD	-7
43	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	UNITED STATES	Concentration Risk, Percentage	0.46	xbrli:pure	2
44	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.46	xbrli:pure	2
45	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.46	xbrli:pure	2
46	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	UNITED STATES	Concentration Risk, Percentage	0.44	xbrli:pure	2
47	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.44	xbrli:pure	2
48	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.44	xbrli:pure	2
49	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	UNITED STATES	Concentration Risk, Percentage	0.43	xbrli:pure	2
50	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Sales Revenue, Services, Net [Member]	Concentration Risk, Percentage	0.43	xbrli:pure	2
51	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographic Concentration Risk [Member]	Concentration Risk, Percentage	0.43	xbrli:pure	2
52	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographical [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Type of Adoption [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Benchmark [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Property, Plant and Equipment, Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Scenario, Unspecified [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
59	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
60	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographical [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
61	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Type of Adoption [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
62	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Benchmark [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
63	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
64	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Property, Plant and Equipment, Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
65	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Scenario, Unspecified [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
66	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
67	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
68	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
69	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
70	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
71	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
72	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
73	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
74	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
75	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
76	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
77	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
78	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
79	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Goodwill, Impairment Loss	0	iso4217:USD	INF
80	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Number of Operating Segments	1	fb:segment	INF
81	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Number of Operating Segments	1	fb:segment	INF
82	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Number of Operating Segments	1	fb:segment	INF
83	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Number of Operating Segments	1	fb:segment	INF
84	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Number of Operating Segments	1	fb:segment	INF
85	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Number of Operating Segments	1	fb:segment	INF
86	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Number of Operating Segments	1	fb:segment	INF
87	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Number of Reportable Segments	1	fb:segment	INF
88	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Number of Reportable Segments	1	fb:segment	INF
89	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Number of Reportable Segments	1	fb:segment	INF
90	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Number of Reportable Segments	1	fb:segment	INF
91	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Number of Reportable Segments	1	fb:segment	INF
92	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Number of Reportable Segments	1	fb:segment	INF
93	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Number of Reportable Segments	1	fb:segment	INF
94	0001326801 (http://www.sec.gov/CIK)	2019-01-01	Accounting Standards Update 2016-02 [Member]	Operating Lease, Liability	6000000000	iso4217:USD	-9
95	0001326801 (http://www.sec.gov/CIK)	2019-01-01	Scenario, Forecast [Member]	Operating Lease, Liability	6000000000	iso4217:USD	-9
96	0001326801 (http://www.sec.gov/CIK)	2019-01-01	Accounting Standards Update 2016-02 [Member]	Operating Lease, Right-of-Use Asset	6000000000	iso4217:USD	-9
97	0001326801 (http://www.sec.gov/CIK)	2019-01-01	Scenario, Forecast [Member]	Operating Lease, Right-of-Use Asset	6000000000	iso4217:USD	-9
98	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Maximum [Member]	Property, Plant and Equipment, Useful Life	_1116008
99	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:ComputerSoftwareOfficeEquipmentAndOtherMember (label)	Property, Plant and Equipment, Useful Life	_1116618
100	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Maximum [Member]	Property, Plant and Equipment, Useful Life	_1117208
101	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Building [Member]	Property, Plant and Equipment, Useful Life	_1117798
102	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Maximum [Member]	Property, Plant and Equipment, Useful Life	_1118388
103	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Technology Equipment [Member]	Property, Plant and Equipment, Useful Life	_1118978
104	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Minimum [Member]	Property, Plant and Equipment, Useful Life	_1119568
105	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:ComputerSoftwareOfficeEquipmentAndOtherMember (label)	Property, Plant and Equipment, Useful Life	_1120178
106	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Minimum [Member]	Property, Plant and Equipment, Useful Life	_1120768
107	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Building [Member]	Property, Plant and Equipment, Useful Life	_1121358
108	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Minimum [Member]	Property, Plant and Equipment, Useful Life	_1121948
109	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Technology Equipment [Member]	Property, Plant and Equipment, Useful Life	_1122538
110	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
111	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographical [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
112	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Type of Adoption [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
113	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Benchmark [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
114	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Type [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
115	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Property, Plant and Equipment, Type [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
116	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Scenario, Unspecified [Domain]	Provision for Doubtful Accounts	66000000	iso4217:USD	-6
117	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
118	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographical [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
119	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Type of Adoption [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
120	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Benchmark [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
121	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Type [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
122	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Property, Plant and Equipment, Type [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
123	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Scenario, Unspecified [Domain]	Provision for Doubtful Accounts	48000000	iso4217:USD	-6
124	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
125	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
126	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
127	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
128	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
129	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
130	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Provision for Doubtful Accounts	77000000	iso4217:USD	-6
131	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
132	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
133	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Type of Adoption [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
134	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
135	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
136	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Property, Plant and Equipment, Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
137	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Scenario, Unspecified [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	27638000000	iso4217:USD	-6
138	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	12580000000	iso4217:USD	-7
139	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
140	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
141	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Type of Adoption [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
142	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
143	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
144	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Property, Plant and Equipment, Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
145	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Scenario, Unspecified [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	40653000000	iso4217:USD	-6
146	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	17730000000	iso4217:USD	-7
147	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
148	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Geographical [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
149	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Type of Adoption [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
150	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Benchmark [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
151	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Concentration Risk Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
152	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Property, Plant and Equipment, Type [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
153	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Scenario, Unspecified [Domain]	Revenue from Contract with Customer, Excluding Assessed Tax	55838000000	iso4217:USD	-6
154	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	UNITED STATES	Revenue from Contract with Customer, Excluding Assessed Tax	24100000000	iso4217:USD	-7

Fact Table
Network	2403402 - Disclosure - Earnings per Share (Details) (http://www.facebook.com/role/EarningsPerShareDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	546000000	xbrli:shares	-6
2	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	0	xbrli:shares	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	528000000	xbrli:shares	-6
4	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	0	xbrli:shares	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	484000000	xbrli:shares	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToConversionOfCommonStock (label)	0	xbrli:shares	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	7000000	xbrli:shares	-6
8	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	3000000	xbrli:shares	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	2000000	xbrli:shares	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	0	xbrli:shares	-6
11	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	0	xbrli:shares	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:IncrementalCommonSharesAttributableToSharesSubjectToRepurchase (label)	0	xbrli:shares	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	1942000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	0	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	2898000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	0	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	3701000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAsResultOfConversionOfClassBToClassAShares (label)	0	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	29000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	0	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	14000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	0	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	1000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeAttributableToParticipatingSecurities (label)	0	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	0	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	14000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	0	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	-13000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	0	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:ReallocationOfNetIncomeToClassBCommonStock (label)	-16000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	fb:WeightedAverageSharesOutstanding (label)	2323000000	xbrli:shares	-6
32	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	fb:WeightedAverageSharesOutstanding (label)	548000000	xbrli:shares	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	fb:WeightedAverageSharesOutstanding (label)	2375000000	xbrli:shares	-6
34	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	fb:WeightedAverageSharesOutstanding (label)	528000000	xbrli:shares	-6
35	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	fb:WeightedAverageSharesOutstanding (label)	2406000000	xbrli:shares	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	fb:WeightedAverageSharesOutstanding (label)	484000000	xbrli:shares	-6
37	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Earnings Per Share, Basic	3.56	iso4217:USD/xbrli:shares	2
38	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Earnings Per Share, Basic	3.56	iso4217:USD/xbrli:shares	2
39	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Earnings Per Share, Basic	3.56	iso4217:USD/xbrli:shares	2
40	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Earnings Per Share, Basic	3.56	iso4217:USD/xbrli:shares	2
41	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Earnings Per Share, Basic	5.49	iso4217:USD/xbrli:shares	2
42	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Earnings Per Share, Basic	5.49	iso4217:USD/xbrli:shares	2
43	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Earnings Per Share, Basic	5.49	iso4217:USD/xbrli:shares	2
44	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Earnings Per Share, Basic	5.49	iso4217:USD/xbrli:shares	2
45	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Earnings Per Share, Basic	7.65	iso4217:USD/xbrli:shares	2
46	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Earnings Per Share, Basic	7.65	iso4217:USD/xbrli:shares	2
47	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Earnings Per Share, Basic	7.65	iso4217:USD/xbrli:shares	2
48	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Earnings Per Share, Basic	7.65	iso4217:USD/xbrli:shares	2
49	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Earnings Per Share, Diluted	3.49	iso4217:USD/xbrli:shares	2
50	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Earnings Per Share, Diluted	3.49	iso4217:USD/xbrli:shares	2
51	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Earnings Per Share, Diluted	3.49	iso4217:USD/xbrli:shares	2
52	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Earnings Per Share, Diluted	3.49	iso4217:USD/xbrli:shares	2
53	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Earnings Per Share, Diluted	5.39	iso4217:USD/xbrli:shares	2
54	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Earnings Per Share, Diluted	5.39	iso4217:USD/xbrli:shares	2
55	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Earnings Per Share, Diluted	5.39	iso4217:USD/xbrli:shares	2
56	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Earnings Per Share, Diluted	5.39	iso4217:USD/xbrli:shares	2
57	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Earnings Per Share, Diluted	7.57	iso4217:USD/xbrli:shares	2
58	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Earnings Per Share, Diluted	7.57	iso4217:USD/xbrli:shares	2
59	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Earnings Per Share, Diluted	7.57	iso4217:USD/xbrli:shares	2
60	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Earnings Per Share, Diluted	7.57	iso4217:USD/xbrli:shares	2
61	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6000000	xbrli:shares	-6
62	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6000000	xbrli:shares	-6
63	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6000000	xbrli:shares	-6
64	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6000000	xbrli:shares	-6
65	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	49000000	xbrli:shares	-6
66	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	49000000	xbrli:shares	-6
67	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	5000000	xbrli:shares	-6
68	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	5000000	xbrli:shares	-6
69	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4000000	xbrli:shares	-6
70	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4000000	xbrli:shares	-6
71	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4000000	xbrli:shares	-6
72	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4000000	xbrli:shares	-6
73	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	49000000	xbrli:shares	-6
74	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	49000000	xbrli:shares	-6
75	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	3000000	xbrli:shares	-6
76	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	3000000	xbrli:shares	-6
77	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2000000	xbrli:shares	-6
78	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2000000	xbrli:shares	-6
79	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2000000	xbrli:shares	-6
80	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2000000	xbrli:shares	-6
81	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	29000000	xbrli:shares	-6
82	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	29000000	xbrli:shares	-6
83	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1000000	xbrli:shares	-6
84	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1000000	xbrli:shares	-6
85	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
86	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Net Income (Loss) Attributable to Parent	10217000000	iso4217:USD	-6
87	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Net Income (Loss) Attributable to Parent	8270000000	iso4217:USD	-6
88	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Net Income (Loss) Attributable to Parent	1947000000	iso4217:USD	-6
89	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
90	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Net Income (Loss) Attributable to Parent	15934000000	iso4217:USD	-6
91	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Net Income (Loss) Attributable to Parent	13034000000	iso4217:USD	-6
92	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Net Income (Loss) Attributable to Parent	2900000000	iso4217:USD	-6
93	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
94	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Net Income (Loss) Attributable to Parent	22112000000	iso4217:USD	-6
95	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Net Income (Loss) Attributable to Parent	18411000000	iso4217:USD	-6
96	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Net Income (Loss) Attributable to Parent	3701000000	iso4217:USD	-6
97	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	10188000000	iso4217:USD	-6
98	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	10188000000	iso4217:USD	-6
99	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Basic	8246000000	iso4217:USD	-6
100	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Basic	1942000000	iso4217:USD	-6
101	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	15920000000	iso4217:USD	-6
102	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	15920000000	iso4217:USD	-6
103	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Basic	13022000000	iso4217:USD	-6
104	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Basic	2898000000	iso4217:USD	-6
105	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	22111000000	iso4217:USD	-6
106	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Net Income (Loss) Available to Common Stockholders, Basic	22111000000	iso4217:USD	-6
107	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Basic	18410000000	iso4217:USD	-6
108	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Basic	3701000000	iso4217:USD	-6
109	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	10217000000	iso4217:USD	-6
110	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	1956000000	iso4217:USD	-6
111	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	15934000000	iso4217:USD	-6
112	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	2885000000	iso4217:USD	-6
113	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	22112000000	iso4217:USD	-6
114	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Net Income (Loss) Available to Common Stockholders, Diluted	3685000000	iso4217:USD	-6
115	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	29000000	iso4217:USD	-6
116	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	29000000	iso4217:USD	-6
117	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	24000000	iso4217:USD	-6
118	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	5000000	iso4217:USD	-6
119	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	14000000	iso4217:USD	-6
120	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	14000000	iso4217:USD	-6
121	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	12000000	iso4217:USD	-6
122	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	2000000	iso4217:USD	-6
123	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	1000000	iso4217:USD	-6
124	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	1000000	iso4217:USD	-6
125	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	1000000	iso4217:USD	-6
126	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0	iso4217:USD	-6
127	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2925000000	xbrli:shares	-6
128	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2925000000	xbrli:shares	-6
129	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Diluted	2925000000	xbrli:shares	-6
130	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Diluted	560000000	xbrli:shares	-6
131	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2956000000	xbrli:shares	-6
132	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2956000000	xbrli:shares	-6
133	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Diluted	2956000000	xbrli:shares	-6
134	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Diluted	535000000	xbrli:shares	-6
135	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2921000000	xbrli:shares	-6
136	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Diluted	2921000000	xbrli:shares	-6
137	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Diluted	2921000000	xbrli:shares	-6
138	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Diluted	487000000	xbrli:shares	-6
139	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	6000000	xbrli:shares	-6
140	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	2000000	xbrli:shares	-6
141	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	2000000	xbrli:shares	-6
142	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	0	xbrli:shares	-6
143	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	0	xbrli:shares	-6
144	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	0	xbrli:shares	-6
145	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Basic	2863000000	xbrli:shares	-6
146	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Basic	2863000000	xbrli:shares	-6
147	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Basic	2317000000	xbrli:shares	-6
148	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Basic	546000000	xbrli:shares	-6
149	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Basic	2901000000	xbrli:shares	-6
150	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Basic	2901000000	xbrli:shares	-6
151	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Basic	2373000000	xbrli:shares	-6
152	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Basic	528000000	xbrli:shares	-6
153	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Weighted Average Number of Shares Outstanding, Basic	2890000000	xbrli:shares	-6
154	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Weighted Average Number of Shares Outstanding, Basic	2890000000	xbrli:shares	-6
155	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class A [Member]	Weighted Average Number of Shares Outstanding, Basic	2406000000	xbrli:shares	-6
156	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Common Class B [Member]	Weighted Average Number of Shares Outstanding, Basic	484000000	xbrli:shares	-6

Fact Table
Network	2404402 - Disclosure - Cash and Cash Equivalents, and Marketable Securities (Details) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash and Cash Equivalents [Domain]	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (label)	41711000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Financial Instruments [Domain]	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (label)	41711000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash and Cash Equivalents [Domain]	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (label)	41114000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Financial Instruments [Domain]	fb:CashCashEquivalentsAndMarketableSecuritiesAtCarryingValue (label)	41114000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	289000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	289000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	357000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	357000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Current	33632000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Current	33632000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	10944000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	12766000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	9922000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	9922000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	10944000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	12766000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Current	31095000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Current	31095000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8333000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	13836000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8926000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8926000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8333000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	13836000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Cash and Cash Equivalents [Domain]	Cash and Cash Equivalents, at Carrying Value	8903000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Financial Instruments [Domain]	Cash and Cash Equivalents, at Carrying Value	8903000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash and Cash Equivalents [Domain]	Cash and Cash Equivalents, at Carrying Value	8079000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Financial Instruments [Domain]	Cash and Cash Equivalents, at Carrying Value	8079000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, at Carrying Value	440000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash [Member]	Cash and Cash Equivalents, at Carrying Value	2212000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	68000000	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, at Carrying Value	5268000000	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	25000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	66000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash and Cash Equivalents [Domain]	Cash and Cash Equivalents, at Carrying Value	10019000000	iso4217:USD	-6
48	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Financial Instruments [Domain]	Cash and Cash Equivalents, at Carrying Value	10019000000	iso4217:USD	-6
49	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, at Carrying Value	369000000	iso4217:USD	-6
50	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash [Member]	Cash and Cash Equivalents, at Carrying Value	2713000000	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	1000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, at Carrying Value	6792000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	54000000	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, at Carrying Value	90000000	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	169000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	169000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Cash and Cash Equivalents [Domain]	Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	332000000	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Financial Instruments [Domain]	Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	332000000	iso4217:USD	-6

Fact Table
Network	2404403 - Disclosure - Cash and Cash Equivalents, and Marketable Securities - Contractual Maturities of Debt Securities (Details) (http://www.facebook.com/role/CashAndCashEquivalentsAndMarketableSecuritiesContractualMaturitiesOfDebtSecuritiesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	25656000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	21349000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	7976000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	9746000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Debt Securities, Available-for-sale, Current	33632000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Debt Securities, Available-for-sale, Current	31095000000	iso4217:USD	-6

Fact Table
Network	2406402 - Disclosure - Fair Value Measurement (Details) (http://www.facebook.com/role/FairValueMeasurementDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Assets, Fair Value Disclosure	29069000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Assets, Fair Value Disclosure	10430000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Assets, Fair Value Disclosure	0	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Assets, Fair Value Disclosure	29105000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Assets, Fair Value Disclosure	9296000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Assets, Fair Value Disclosure	0	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	10944000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	10944000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	12766000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	12766000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	9922000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	9922000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	8333000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8333000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Debt Securities, Available-for-sale, Current	13836000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	13836000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	8926000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	8926000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Debt Securities, Available-for-sale, Current	0	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	440000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	440000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
48	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
49	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
50	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
51	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	68000000	iso4217:USD	-6
52	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	68000000	iso4217:USD	-6
53	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
54	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
55	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	5268000000	iso4217:USD	-6
56	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	5268000000	iso4217:USD	-6
57	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
58	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
59	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
60	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
61	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	25000000	iso4217:USD	-6
62	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	25000000	iso4217:USD	-6
63	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
64	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
65	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
66	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
67	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	66000000	iso4217:USD	-6
68	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	66000000	iso4217:USD	-6
69	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
70	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
71	0001326801 (http://www.sec.gov/CIK)	2017-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
72	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
73	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
74	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
75	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	369000000	iso4217:USD	-6
76	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	369000000	iso4217:USD	-6
77	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Bank Time Deposits [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
78	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
79	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
80	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
81	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	1000000	iso4217:USD	-6
82	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	1000000	iso4217:USD	-6
83	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Corporate Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
84	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
85	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	6792000000	iso4217:USD	-6
86	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	6792000000	iso4217:USD	-6
87	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
88	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
89	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Money Market Funds [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
90	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
91	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	54000000	iso4217:USD	-6
92	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	54000000	iso4217:USD	-6
93	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
94	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
95	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Agencies Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
96	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
97	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	90000000	iso4217:USD	-6
98	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 1 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	90000000	iso4217:USD	-6
99	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
100	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 2 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
101	0001326801 (http://www.sec.gov/CIK)	2018-12-31	US Government Debt Securities [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6
102	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Fair Value, Inputs, Level 3 [Member]	Cash and Cash Equivalents, Fair Value Disclosure	0	iso4217:USD	-6

Fact Table
Network	2407402 - Disclosure - Property and Equipment (Detail) (http://www.facebook.com/role/PropertyAndEquipmentDetail)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Property, Plant and Equipment, Type [Domain]	Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	4616000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Property, Plant and Equipment, Type [Domain]	Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	6890000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Property, Plant and Equipment, Type [Domain]	Property, Plant and Equipment, Gross	18337000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Property, Plant and Equipment, Type [Domain]	Property, Plant and Equipment, Gross	31573000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Property, Plant and Equipment, Type [Domain]	Property, Plant and Equipment, Net	13721000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Property, Plant and Equipment, Type [Domain]	Property, Plant and Equipment, Net	24683000000	iso4217:USD	-6

Fact Table
Network	2408402 - Disclosure - Goodwill and Intangible Assets - Change in Carrying Amount (Details) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsChangeInCarryingAmountDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-12-31	null	Goodwill	18122000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Goodwill	18221000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Goodwill	18301000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Goodwill, Acquired During Period	90000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Goodwill, Acquired During Period	88000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Goodwill, Foreign Currency Translation Gain (Loss)	9000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Goodwill, Foreign Currency Translation Gain (Loss)	-8000000	iso4217:USD	-6

Fact Table
Network	2408403 - Disclosure - Goodwill and Intangible Assets - Intangible Assets (Detail) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsDetail)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_836282
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:AcquiredusersMember (label)	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_836884
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Other Intangible Assets [Member]	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_837474
4	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Patents [Member]	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_838064
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Technology-Based Intangible Assets [Member]	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_838654
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Trade Names [Member]	Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	_839244
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Accumulated Amortization	2720000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Accumulated Amortization	971000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	133000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Patents [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	499000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	711000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	406000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Accumulated Amortization	3360000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Accumulated Amortization	1260000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	147000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Patents [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	565000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	871000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Accumulated Amortization	517000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Gross	4604000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Gross	2056000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Gross	162000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Patents [Member]	Finite-Lived Intangible Assets, Gross	785000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Gross	972000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Gross	629000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Gross	4654000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2018-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Gross	2056000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Gross	162000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Patents [Member]	Finite-Lived Intangible Assets, Gross	805000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Gross	1002000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Gross	629000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Net	1884000000	iso4217:USD	-6
32	0001326801 (http://www.sec.gov/CIK)	2017-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Net	1085000000	iso4217:USD	-6
33	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Net	29000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Patents [Member]	Finite-Lived Intangible Assets, Net	286000000	iso4217:USD	-6
35	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Net	261000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Net	223000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Finite-Lived Intangible Assets, Major Class Name [Domain]	Finite-Lived Intangible Assets, Net	1294000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2018-12-31	fb:AcquiredusersMember (label)	Finite-Lived Intangible Assets, Net	796000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Other Intangible Assets [Member]	Finite-Lived Intangible Assets, Net	15000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Patents [Member]	Finite-Lived Intangible Assets, Net	240000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Technology-Based Intangible Assets [Member]	Finite-Lived Intangible Assets, Net	131000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Trade Names [Member]	Finite-Lived Intangible Assets, Net	112000000	iso4217:USD	-6

Fact Table
Network	2408404 - Disclosure - Goodwill and Intangible Assets - Amortization Expense (Details) (http://www.facebook.com/role/GoodwillAndIntangibleAssetsAmortizationExpenseDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, after Year Five	31000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	553000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, Year Five	26000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, Year Four	33000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, Year Three	273000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Amortization Expense, Year Two	378000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Finite-Lived Intangible Assets, Net	1884000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Finite-Lived Intangible Assets, Net	1294000000	iso4217:USD	-6

Fact Table
Network	2409402 - Disclosure - Liabilities (Details) (http://www.facebook.com/role/LiabilitiesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	fb:IncomeTaxesPayableNoncurrent (label)	5372000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	fb:IncomeTaxesPayableNoncurrent (label)	4655000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	fb:NotionalCashPoolOverdraftBalance (label)	0	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	fb:NotionalCashPoolOverdraftBalance (label)	500000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	fb:PropertyandEquipmentAccruedLiabilities (label)	685000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	fb:PropertyandEquipmentAccruedLiabilities (label)	1531000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Accrued Liabilities, Current	2892000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Accrued Liabilities, Current	5509000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Income Tax Liabilities, Net	50000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Income Tax Liabilities, Net	673000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Employee-related Liabilities, Current	790000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Employee-related Liabilities, Current	1203000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Other Accrued Liabilities, Current	1077000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Other Accrued Liabilities, Current	1784000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Other Liabilities, Noncurrent	6417000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Other Liabilities, Noncurrent	6190000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Other Sundry Liabilities, Noncurrent	995000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Other Sundry Liabilities, Noncurrent	862000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Taxes Payable, Current	340000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Taxes Payable, Current	491000000	iso4217:USD	-6

Fact Table
Network	2410401 - Disclosure - Long-term Debt - Borrowings (Details) (http://www.facebook.com/role/LongTermDebtBorrowingsDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value		Unit	Rounding	Parenthetical Explanations
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Revolving Credit Facility [Member]	Long-term Line of Credit	0		iso4217:USD	INF
2	0001326801 (http://www.sec.gov/CIK)	2016-05-31	Revolving Credit Facility [Member]	Line of Credit Facility, Maximum Borrowing Capacity	2000000000.0		iso4217:USD	INF

Fact Table
Network	2411402 - Disclosure - Commitments and Contingencies (Details) (http://www.facebook.com/role/CommitmentsAndContingenciesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Contractual Obligation	6170000000	iso4217:USD	-7
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Long-term Purchase Commitment, Period	_808582
3	0001326801 (http://www.sec.gov/CIK)	2018-07-27 to 2018-07-27	Range [Domain]	Loss Contingency, New Claims Filed, Number	2	fb:claim	INF
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments Due	14651000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments Due, Next Twelve Months	698000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments, Due in Five Years	1054000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments, Due in Four Years	1048000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments, Due in Three Years	1055000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments, Due in Two Years	946000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Operating Leases, Future Minimum Payments, Due Thereafter	9850000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Operating Leases, Rent Expense, Net	269000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Operating Leases, Rent Expense, Net	363000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Operating Leases, Rent Expense, Net	629000000	iso4217:USD	-6

Fact Table
Network	2412402 - Disclosure - Stockholders' Equity - Common Stock (Details) (http://www.facebook.com/role/StockholdersEquityCommonStockDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	fb:CommonStockNumberOfVotesByClass (label)	1	fb:vote	INF
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	fb:CommonStockNumberOfVotesByClass (label)	10	fb:vote	INF
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Class of Stock [Domain]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Class of Stock [Domain]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Par or Stated Value Per Share	6.0e-6	iso4217:USD/xbrli:shares	INF
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares Authorized	5000000000	xbrli:shares	INF
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares Authorized	4141000000	xbrli:shares	INF
9	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares Authorized	5000000000	xbrli:shares	INF
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares Authorized	4141000000	xbrli:shares	INF
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares, Issued	2397000000	xbrli:shares	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares, Issued	509000000	xbrli:shares	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares, Issued	2385000000	xbrli:shares	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares, Issued	469000000	xbrli:shares	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class A [Member]	Common Stock, Shares, Outstanding	2397000000	xbrli:shares	-6
16	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Common Class B [Member]	Common Stock, Shares, Outstanding	509000000	xbrli:shares	-6
17	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Common Stock, Shares, Outstanding	2385000000	xbrli:shares	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class B [Member]	Common Stock, Shares, Outstanding	469000000	xbrli:shares	-6

Fact Table
Network	2412403 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details) (http://www.facebook.com/role/StockholdersEquityShareRepurchaseProgramDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-06-30	null	Stock Repurchase Program, Authorized Amount	6000000000.0	iso4217:USD	INF
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Stock Repurchase Program, Authorized Amount	9000000000.0	iso4217:USD	INF
3	0001326801 (http://www.sec.gov/CIK)	2018-04-30	null	Stock Repurchase Program, Authorized Amount	9000000000.0	iso4217:USD	INF
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Stock Repurchase Program, Remaining Authorized Repurchase Amount	9000000000	iso4217:USD	-8
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Stock Repurchased and Retired During Period, Shares	79000000	xbrli:shares	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Stock Repurchased and Retired During Period, Value	12930000000	iso4217:USD	-7

Fact Table
Network	2412404 - Disclosure - Stockholders' Equity - Share-based Compensation Plans (Detail) (http://www.facebook.com/role/StockholdersEquityShareBasedCompensationPlansDetail)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Plan Name [Domain]	fb:ShareBasedEmployeeCompensationPlansNumber (label)	2	fb:plans	INF
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Subsequent Event Type [Domain]	fb:ShareBasedEmployeeCompensationPlansNumber (label)	2	fb:plans	INF
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:StockOptionPlanTwentyTwelveMember (label)	fb:SharesReservedForIssuanceIncreasePercentage (label)	0.025	xbrli:pure	INF
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	fb:StockOptionPlanTwentyTwelveMember (label)	Common Stock, Capital Shares Reserved for Future Issuance	83000000	xbrli:shares	-6
5	0001326801 (http://www.sec.gov/CIK)	2019-01-01 to 2019-01-01	Subsequent Event [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	60000000	xbrli:shares	INF

Fact Table
Network	2412405 - Disclosure - Stockholders' Equity - Stock Option Award Activity (Details) (http://www.facebook.com/role/StockholdersEquityStockOptionAwardActivityDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1137000	xbrli:shares	-3
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	13.74	iso4217:USD/xbrli:shares	2
3	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Equity Award [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	309000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Class of Stock [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	309000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Equity Award [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	359000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Class of Stock [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	359000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	315000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Class of Stock [Domain]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	315000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	0	xbrli:shares	INF
10	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	xbrli:shares	INF
11	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	133000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3078000	xbrli:shares	-3
13	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1137000	xbrli:shares	-3
14	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	10.06	iso4217:USD/xbrli:shares	2
15	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	13.74	iso4217:USD/xbrli:shares	2
16	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	7.9	iso4217:USD/xbrli:shares	2
17	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Common Class A [Member]	Share Price	131.09	iso4217:USD/xbrli:shares	INF
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	133000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	_785640
20	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	_786230
21	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Employee Stock Option [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	1941000	xbrli:shares	-3

Fact Table
Network	2412406 - Disclosure - Stockholders' Equity - RSU Award Activity (Details) (http://www.facebook.com/role/StockholdersEquityRsuAwardActivityDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	8803000	xbrli:shares	-3
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	119.25	iso4217:USD/xbrli:shares	2
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	38283000	xbrli:shares	-3
4	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	168.38	iso4217:USD/xbrli:shares	2
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	81214000	xbrli:shares	-3
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	67298000	xbrli:shares	-3
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	110.49	iso4217:USD/xbrli:shares	2
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	144.77	iso4217:USD/xbrli:shares	2
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	43396000	xbrli:shares	-3
10	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	106.59	iso4217:USD/xbrli:shares	2

Fact Table
Network	2412407 - Disclosure - Stockholders' Equity - Additional Award Disclosures (Details) (http://www.facebook.com/role/StockholdersEquityAdditionalAwardDisclosuresDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Equity Award [Domain]	Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	8960000000	iso4217:USD	-7
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Equity Award [Domain]	Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	_765158
3	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	4920000000	iso4217:USD	-7
4	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	6760000000	iso4217:USD	-7
5	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Restricted Stock Units (RSUs) [Member]	Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	7570000000	iso4217:USD	-7

Fact Table
Network	2413402 - Disclosure - Interest and other income (expense), net (Details) (http://www.facebook.com/role/InterestAndOtherIncomeExpenseNetDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Foreign Currency Transaction Gain (Loss), before Tax	-76000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Foreign Currency Transaction Gain (Loss), before Tax	-6000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Foreign Currency Transaction Gain (Loss), before Tax	-213000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Interest Expense	10000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Interest Expense	6000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Interest Expense	9000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Investment Income, Interest	176000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Investment Income, Interest	398000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Investment Income, Interest	661000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Nonoperating Income (Expense)	91000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Nonoperating Income (Expense)	391000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Nonoperating Income (Expense)	448000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Other Nonoperating Income (Expense)	1000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Other Nonoperating Income (Expense)	5000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Other Nonoperating Income (Expense)	9000000	iso4217:USD	-6

Fact Table
Network	2414402 - Disclosure - Income Taxes - Schedule for Income Before Income Tax (Details) (http://www.facebook.com/role/IncomeTaxesScheduleForIncomeBeforeIncomeTaxDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Domestic	6368000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Domestic	7079000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Domestic	8800000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	12518000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	20594000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	25361000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Foreign	6150000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Foreign	13515000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Income (Loss) from Continuing Operations before Income Taxes, Foreign	16561000000	iso4217:USD	-6

Fact Table
Network	2414403 - Disclosure - Income Taxes - Provision for Income Taxes (Details) (http://www.facebook.com/role/IncomeTaxesProvisionForIncomeTaxesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	fb:TotalDeferredIncomeTaxExpenseBenefit (label)	-457000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	fb:TotalDeferredIncomeTaxExpenseBenefit (label)	-374000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	fb:TotalDeferredIncomeTaxExpenseBenefit (label)	295000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Current Federal Tax Expense (Benefit)	2384000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Current Federal Tax Expense (Benefit)	4455000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Current Federal Tax Expense (Benefit)	1747000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Current Foreign Tax Expense (Benefit)	195000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Current Foreign Tax Expense (Benefit)	389000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Current Foreign Tax Expense (Benefit)	1031000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Current Income Tax Expense (Benefit)	2758000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Current Income Tax Expense (Benefit)	5034000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Current Income Tax Expense (Benefit)	2954000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Current State and Local Tax Expense (Benefit)	179000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Current State and Local Tax Expense (Benefit)	190000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Current State and Local Tax Expense (Benefit)	176000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Deferred Federal Income Tax Expense (Benefit)	-414000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Deferred Federal Income Tax Expense (Benefit)	-296000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Deferred Federal Income Tax Expense (Benefit)	316000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Deferred Foreign Income Tax Expense (Benefit)	-25000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Deferred Foreign Income Tax Expense (Benefit)	-45000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Deferred Foreign Income Tax Expense (Benefit)	-55000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Deferred State and Local Income Tax Expense (Benefit)	-18000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Deferred State and Local Income Tax Expense (Benefit)	-33000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Deferred State and Local Income Tax Expense (Benefit)	34000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Income Tax Expense (Benefit)	2301000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Income Tax Expense (Benefit)	4660000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Income Tax Expense (Benefit)	3249000000	iso4217:USD	-6

Fact Table
Network	2414404 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Details) (http://www.facebook.com/role/IncomeTaxesEffectiveIncomeTaxRateReconciliationDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent (label)	0.0	xbrli:pure	3
2	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent (label)	0.11	xbrli:pure	3
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	fb:EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017Percent (label)	0.0	xbrli:pure	3
4	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent (label)	0.07	xbrli:pure	3
5	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent (label)	0.058	xbrli:pure	3
6	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	fb:EffectiveTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent (label)	0.026	xbrli:pure	3
7	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, Percent	0.184	xbrli:pure	3
8	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, Percent	0.226	xbrli:pure	3
9	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, Percent	0.128	xbrli:pure	3
10	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
11	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
12	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.21	xbrli:pure	INF
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	0.128	xbrli:pure	3
14	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	0.186	xbrli:pure	3
15	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	0.059	xbrli:pure	3
16	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.01	xbrli:pure	3
17	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.004	xbrli:pure	3
18	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.003	xbrli:pure	3
19	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.019	xbrli:pure	3
20	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.009	xbrli:pure	3
21	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.003	xbrli:pure	3
22	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.01	xbrli:pure	3
23	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.006	xbrli:pure	3
24	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.007	xbrli:pure	3
25	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	0.007	xbrli:pure	3
26	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	0.009	xbrli:pure	3
27	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	0.01	xbrli:pure	3

Fact Table
Network	2414405 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) (http://www.facebook.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Liabilities, Gross	1019000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Liabilities, Gross	1596000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Gross	2706000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Gross	3403000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Net	1249000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Net	1207000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Net of Valuation Allowance	2268000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Net of Valuation Allowance	2803000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Operating Loss Carryforwards	1300000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Operating Loss Carryforwards	1825000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Other	131000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Other	153000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Tax Credit Carryforwards	509000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Tax Credit Carryforwards	668000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	385000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	270000000	iso4217:USD	-6
17	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	381000000	iso4217:USD	-6
18	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	487000000	iso4217:USD	-6
19	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Assets, Valuation Allowance	438000000	iso4217:USD	-6
20	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Assets, Valuation Allowance	600000000	iso4217:USD	-6
21	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Liabilities, Intangible Assets	309000000	iso4217:USD	-6
22	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Liabilities, Intangible Assets	195000000	iso4217:USD	-6
23	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Liabilities, Property, Plant and Equipment	622000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Liabilities, Property, Plant and Equipment	1401000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Deferred Tax Liabilities, Undistributed Foreign Earnings	88000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Deferred Tax Liabilities, Undistributed Foreign Earnings	0	iso4217:USD	-6

Fact Table
Network	2414406 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) (http://www.facebook.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2015-12-31	null	Unrecognized Tax Benefits	3017000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2016-12-31	null	Unrecognized Tax Benefits	3309000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	null	Unrecognized Tax Benefits	3870000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	null	Unrecognized Tax Benefits	4678000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	36000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	34000000	iso4217:USD	-6
7	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	396000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	11000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	13000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	84000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	307000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	536000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	831000000	iso4217:USD	-6
14	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	32000000	iso4217:USD	-6
15	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	72000000	iso4217:USD	-6
16	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	null	Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	457000000	iso4217:USD	-6

Fact Table
Network	2414407 - Disclosure - Income Taxes - Narrative (Detail) (http://www.facebook.com/role/IncomeTaxesNarrativeDetail)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod (label)	_661116
2	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Tax Authority [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod (label)	_661742
3	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Tax Period [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardChangeInOwnershipPercentageOverPeriod (label)	_662368
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold (label)	0.5	xbrli:pure	INF
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Income Tax Authority [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold (label)	0.5	xbrli:pure	INF
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Tax Period [Domain]	fb:EventCausingOwnershipChangeAndLossInNetOperatingLossAndTaxCreditCarryforwardCumulativeStockOwnershipChangeThreshhold (label)	0.5	xbrli:pure	INF
7	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Range [Domain]	Deferred Tax Assets, Valuation Allowance	438000000	iso4217:USD	-6
8	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Income Tax Authority [Domain]	Deferred Tax Assets, Valuation Allowance	438000000	iso4217:USD	-6
9	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Tax Period [Domain]	Deferred Tax Assets, Valuation Allowance	438000000	iso4217:USD	-6
10	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Deferred Tax Assets, Valuation Allowance	600000000	iso4217:USD	-6
11	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Income Tax Authority [Domain]	Deferred Tax Assets, Valuation Allowance	600000000	iso4217:USD	-6
12	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Tax Period [Domain]	Deferred Tax Assets, Valuation Allowance	600000000	iso4217:USD	-6
13	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Range [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
14	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Income Tax Authority [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
15	0001326801 (http://www.sec.gov/CIK)	2016-01-01 to 2016-12-31	Tax Period [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
16	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Range [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
17	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Income Tax Authority [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
18	0001326801 (http://www.sec.gov/CIK)	2017-01-01 to 2017-12-31	Tax Period [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.35	xbrli:pure	INF
19	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Range [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.21	xbrli:pure	INF
20	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Income Tax Authority [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.21	xbrli:pure	INF
21	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Tax Period [Domain]	Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.21	xbrli:pure	INF
22	0001326801 (http://www.sec.gov/CIK)	2016-07-01 to 2016-07-31	Maximum [Member]	Income Tax Examination, Estimate of Possible Loss	5000000000	iso4217:USD	-8
23	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	Internal Revenue Service (IRS) [Member]	Income Tax Examination, Estimate of Possible Loss	680000000	iso4217:USD	-6
24	0001326801 (http://www.sec.gov/CIK)	2018-01-01 to 2018-12-31	fb:TaxYears2011Through2013Member (label)	Income Tax Examination, Estimate of Possible Loss	680000000	iso4217:USD	-6
25	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Range [Domain]	Income Tax Examination, Penalties and Interest Accrued	154000000	iso4217:USD	-6
26	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Income Tax Authority [Domain]	Income Tax Examination, Penalties and Interest Accrued	154000000	iso4217:USD	-6
27	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Tax Period [Domain]	Income Tax Examination, Penalties and Interest Accrued	154000000	iso4217:USD	-6
28	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Income Tax Examination, Penalties and Interest Accrued	340000000	iso4217:USD	-6
29	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Income Tax Authority [Domain]	Income Tax Examination, Penalties and Interest Accrued	340000000	iso4217:USD	-6
30	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Tax Period [Domain]	Income Tax Examination, Penalties and Interest Accrued	340000000	iso4217:USD	-6
31	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Internal Revenue Service (IRS) [Member]	Operating Loss Carryforwards	7880000000	iso4217:USD	-7
32	0001326801 (http://www.sec.gov/CIK)	2018-12-31	State and Local Jurisdiction [Member]	Operating Loss Carryforwards	2220000000	iso4217:USD	-7
33	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Internal Revenue Service (IRS) [Member]	Tax Credit Carryforward, Amount	290000000	iso4217:USD	-6
34	0001326801 (http://www.sec.gov/CIK)	2018-12-31	State and Local Jurisdiction [Member]	Tax Credit Carryforward, Amount	1910000000	iso4217:USD	-7
35	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Range [Domain]	Unrecognized Tax Benefits	3017000000	iso4217:USD	-6
36	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Income Tax Authority [Domain]	Unrecognized Tax Benefits	3017000000	iso4217:USD	-6
37	0001326801 (http://www.sec.gov/CIK)	2015-12-31	Tax Period [Domain]	Unrecognized Tax Benefits	3017000000	iso4217:USD	-6
38	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Range [Domain]	Unrecognized Tax Benefits	3309000000	iso4217:USD	-6
39	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Income Tax Authority [Domain]	Unrecognized Tax Benefits	3309000000	iso4217:USD	-6
40	0001326801 (http://www.sec.gov/CIK)	2016-12-31	Tax Period [Domain]	Unrecognized Tax Benefits	3309000000	iso4217:USD	-6
41	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Range [Domain]	Unrecognized Tax Benefits	3870000000	iso4217:USD	-6
42	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Income Tax Authority [Domain]	Unrecognized Tax Benefits	3870000000	iso4217:USD	-6
43	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Tax Period [Domain]	Unrecognized Tax Benefits	3870000000	iso4217:USD	-6
44	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Unrecognized Tax Benefits	4678000000	iso4217:USD	-6
45	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Income Tax Authority [Domain]	Unrecognized Tax Benefits	4678000000	iso4217:USD	-6
46	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Tax Period [Domain]	Unrecognized Tax Benefits	4678000000	iso4217:USD	-6
47	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Range [Domain]	Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2940000000	iso4217:USD	-7
48	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Income Tax Authority [Domain]	Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2940000000	iso4217:USD	-7
49	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Tax Period [Domain]	Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2940000000	iso4217:USD	-7

Fact Table
Network	2415402 - Disclosure - Geographical Information - Property and Equipment (Details) (http://www.facebook.com/role/GeographicalInformationPropertyAndEquipmentDetails)
Table	(implied)

#	Reporting Entity [Axis]	Period [Axis]	Scenario [Axis]	Concept	Fact Value	Unit	Rounding
1	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Geographical [Domain]	Property, Plant and Equipment, Net	13721000000	iso4217:USD	-6
2	0001326801 (http://www.sec.gov/CIK)	2017-12-31	UNITED STATES	Property, Plant and Equipment, Net	10406000000	iso4217:USD	-6
3	0001326801 (http://www.sec.gov/CIK)	2017-12-31	Non-US [Member]	Property, Plant and Equipment, Net	3315000000	iso4217:USD	-6
4	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Geographical [Domain]	Property, Plant and Equipment, Net	24683000000	iso4217:USD	-6
5	0001326801 (http://www.sec.gov/CIK)	2018-12-31	UNITED STATES	Property, Plant and Equipment, Net	18950000000	iso4217:USD	-6
6	0001326801 (http://www.sec.gov/CIK)	2018-12-31	Non-US [Member]	Property, Plant and Equipment, Net	5733000000	iso4217:USD	-6

Rules

Type	Defined	Bound	OK	Fail
formula	0	0	0	0
existenceAssertion	0	0	0	0
valueAssertion	0	0	0	0
calculation	143	763	587	176

Rule Details

Errors and Warnings

Other than rule related. The error Type is just a conjecture on the culprit, because some 'bad reports' may contain some XBRL feature we have not yet covered.

Type	Where	What
bad_report	loadContext/D2018Q3Jul27-Jul27	failed((simpleDate(2018-07-27),simpleDate(2018-07-27),2018-07-27@>2018-07-27))
bad_report	loadContext/D2019Q1Jan01-Jan01_us-gaap_SubsequentEventTypeAxis_us-gaap_SubsequentEventMember	failed((simpleDate(2019-01-01),simpleDate(2019-01-01),2019-01-01@>2019-01-01))

For more information: http://logicalcontracts.com/xbrl-and-sbrm-reporting/
DISCLAIMER: this analysis is provided by software still under development, and likely incomplete or even erroneous; do NOT use it other than for experimental, inconsequential purposes

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User Alterations

Table of Contents

Terms

Model Structures

Fact Tables

Rules

Rule Details

Errors and Warnings