SK TELECOM CO LTD (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 1001 - Document - Document and Entity Information Network

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 http://www.sktelecom.com/taxonomy/role/DocumentandEntityInformation
2 Implied Table Table

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3 Document and entity information [abstract] Abstract skm:DocumentAndEntityInformationAbstract
4 Document Type Concept (Submission Type) For Period dei:DocumentType
5 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
6 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
7 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
8 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
9 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
10 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
11 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
12 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
13 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
14 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
15 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
16 Entity Shell Company Concept (Yes/No) For Period dei:EntityShellCompany
17 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
18 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
19 1003 - Statement - Consolidated Statements of Financial Position Network

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 http://www.sktelecom.com/taxonomy/role/StatementOfFinancialPositionCurrentNonCurrent-210000
20 Implied Table Table

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21 Non Current Assets Finance Liabilities [abstract] Abstract skm:NonCurrentAssetsFinanceLiabilitiesAbstract
22 Assets Abstract ifrs-full:AssetsAbstract
23 Current Assets: Abstract ifrs-full:CurrentAssetsAbstract
24 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
25 Short-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
26 Short-term investment securities Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
27 Accounts receivable - trade, net Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
28 Short-term loans, net Concept (Monetary) As Of Debit skm:ShorttermLoansReceivable
29 Accounts receivable - other, net Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
30 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
31 Contract assets Concept (Monetary) As Of Debit ifrs-full:CurrentContractAssets
32 Inventories, net Concept (Monetary) As Of Debit ifrs-full:Inventories
33 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:CurrentDerivativeFinancialAssets
34 Advance payments and other Concept (Monetary) As Of Debit skm:CurrentAdvancedPaymentsAndOtherCurrentAssets
35 Total Current Assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
36 Non-Current Assets: Abstract ifrs-full:NoncurrentAssetsAbstract
37 Long-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentFinancialAssets
38 Long-term investment securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
39 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
40 Property and equipment, net Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
41 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
42 Intangible assets, net Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
43 Long-term contract assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentContractAssets
44 Long-term loans, net Concept (Monetary) As Of Debit skm:LongtermLoansReceivable
45 Long-term accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentReceivables
46 Long-term prepaid expenses Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
47 Guarantee deposits Concept (Monetary) As Of Debit ifrs-full:LongtermDeposits
48 Long-term derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
49 Defined benefit assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan
50 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
51 Other non-current assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
52 Total Non-Current Assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
53 Total Assets Concept (Monetary) As Of Debit ifrs-full:Assets
54 Liabilities and Shareholders' Equity Abstract ifrs-full:EquityAndLiabilitiesAbstract
55 Current Liabilities: Abstract ifrs-full:CurrentLiabilitiesAbstract
56 Short-term borrowings Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
57 Current portion of long-term debt, net Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
58 Current portion of long-term payables - other Concept (Monetary) As Of Credit ifrs-full:CurrentPayablesForPurchaseOfNoncurrentAssets
59 Accounts payable - trade Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
60 Accounts payable - other Concept (Monetary) As Of Credit ifrs-full:OtherCurrentPayables
61 Withholdings Concept (Monetary) As Of Credit ifrs-full:ShorttermEmployeeBenefitsAccruals
62 Accrued expenses Concept (Monetary) As Of Credit ifrs-full:AccrualsClassifiedAsCurrent
63 Income tax payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilities
64 Unearned revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
65 Provisions Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
66 Receipts in advance Concept (Monetary) As Of Credit ifrs-full:CurrentAdvances
67 Contract liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentContractLiabilities
68 Derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentDerivativeFinancialLiabilities
69 Other current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
70 Total Current Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
71 Non-Current Liabilities: Abstract ifrs-full:NoncurrentLiabilitiesAbstract
72 Debentures, excluding current portion, net Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentNotesAndDebenturesIssued
73 Long-term borrowings, excluding current portion, net Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentLoansReceived
74 Long-term payables - other Concept (Monetary) As Of Credit skm:LongtermPayablesOther
75 Long-term unearned revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
76 Long-term contract liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentContractLiabilities
77 Defined benefit liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
78 Long-term derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
79 Long-term provisions Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
80 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
81 Other non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
82 Total Non-Current Liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
83 Total Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
84 Shareholders' Equity Abstract ifrs-full:EquityAbstract
85 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
86 Capital surplus (deficit) and others Concept (Monetary) As Of Credit skm:CapitalSurplusDeficitAndOthers
87 Hybrid bonds Concept (Monetary) As Of Credit ifrs-full:OtherEquityInterest
88 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
89 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
90 Equity attributable to owners of the Parent Company Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
91 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
92 Total Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:Equity
93 Total Liabilities and Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
94 1004 - Statement - Consolidated Statements of Income Network

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 http://www.sktelecom.com/taxonomy/role/StatementOfComprehensiveIncomeProfitOrLossByFunctionOfExpense-310000
95 Implied Table Table

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96 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
97 Operating revenue and other income: Abstract ifrs-full:RevenueAbstract
98 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
99 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
100 Operating revenue and other income Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
101 Operating expenses: Abstract ifrs-full:ExpenseByNatureAbstract
102 Labor Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
103 Commissions Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
104 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
105 Network interconnection Concept (Monetary) For Period Debit skm:NetworkInterconnectionExpense
106 Leased line Concept (Monetary) For Period Debit ifrs-full:ContingentRentsRecognisedAsExpense
107 Advertising Concept (Monetary) For Period Debit ifrs-full:SalesAndMarketingExpense
108 Rent Concept (Monetary) For Period Debit ifrs-full:RentalExpense
109 Cost of goods sold Concept (Monetary) For Period Debit ifrs-full:CostOfMerchandiseSold
110 Others Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
111 Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
112 Operating profit Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
113 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
114 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
115 Gain relating to investments in subsidiaries, associates and joint ventures, net Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
116 Profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
117 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
118 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
119 Attributable to : Abstract ifrs-full:ProfitLossAttributableToAbstract
120 Owners of the Parent Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
121 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
122 Earnings per share Abstract ifrs-full:EarningsPerShareAbstract
123 Basic and diluted earnings per share (in won) Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
124 1005 - Statement - Consolidated Statements of Comprehensive Income Network

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 http://www.sktelecom.com/taxonomy/role/StatementOfComprehensiveIncomeOCIComponentsPresentedNetOfTax-410000
125 Implied Table Table

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126 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
127 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
128 Other comprehensive income (loss) Abstract ifrs-full:OtherComprehensiveIncomeAbstract
129 Items that will never be reclassified to profit or loss, net of taxes: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
130 Remeasurement of defined benefit liabilities Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
131 Valuation loss on financial assets at fair value through other comprehensive income Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax
132 Items that are or may be reclassified subsequently to profit or loss, net of taxes: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
133 Net change in unrealized fair value of available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets
134 Net change in other comprehensive income of investments in associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax
135 Net change in unrealized fair value of derivatives Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
136 Foreign currency translation differences for foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
137 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
138 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
139 Total comprehensive income (loss) attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
140 Owners of the Parent Company Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
141 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
142 1006 - Statement - Consolidated Statements of Changes in Equity Network

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 http://www.sktelecom.com/taxonomy/role/StatementOfChangesInEquity-610000
143 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
144 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
145 Currently stated [member] Member ifrs-full:RestatedMember
146 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
147 Increase (decrease) due to application of IFRS 9 [member] Member skm:IncreaseDecreaseDueToApplicationOfIFRS9Member
148 Restated balance [member] Member skm:RestatedBalanceMember
149 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
150 Equity [member] Member ifrs-full:EquityMember
151 Share capital [member] Member ifrs-full:IssuedCapitalMember
152 Capital surplus (deficit) and others [member] Member skm:CapitalSurplusDeficitAndOtherMember
153 Hybrid bonds [member] Member ifrs-full:OtherEquityInterestMember
154 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
155 Reserves [member] Member ifrs-full:OtherReservesMember
156 Attributable to owners [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
157 Non-controlling interests [member] Member ifrs-full:NoncontrollingInterestsMember
158 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
159 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
160 Total comprehensive income: Abstract ifrs-full:ComprehensiveIncomeAbstract
161 Profit (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
162 Other comprehensive income (loss) (note 13,21,22,28,31) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
163 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
164 Transactions with owners: Abstract skm:IncreaseDecreaseThroughTransactionsWithOwnersAbstract
165 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
166 Annual dividends (note 34) Concept (Monetary) For Period Debit ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent
167 Interim dividends (note 34) Concept (Monetary) For Period Debit skm:InterimDividendsRecognisedAsDistributionsToOwnersOfParent
168 Share option (note 26) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
169 Interest on hybrid bonds Concept (Monetary) For Period Debit skm:InterestOnHybridBonds
170 Repayments of hybrid bonds (note 25) Concept (Monetary) For Period Credit skm:RepaymentOfHybridBonds
171 Proceeds from issuance of hybrid bonds (note 25) Concept (Monetary) For Period Debit skm:IncreaseDecreaseThroughProceedsFromIssuanceOfHybridBonds
172 Comprehensive stock exchange (note 12) Concept (Monetary) For Period Debit skm:IncreaseDecreaseThroughComprehensiveStockExchange
173 Changes in ownership in subsidiaries Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInEquityOfSubsidiaries
174 Transactions with owners Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners
175 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
176 1007 - Statement - Consolidated Statements of Cash Flows Network

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 http://www.sktelecom.com/taxonomy/role/StatementOfCashFlowsDirectMethod-510000
177 Implied Table Table

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178 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
179 Cash flows from operating activities: Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
180 Cash generated from operating activities Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
181 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
182 Adjustments for income and expenses (note 39) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital
183 Changes in assets and liabilities related to operating activities (note 39) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
184 Sub-total Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperations
185 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsOperatingActivities
186 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedClassifiedAsOperatingActivities
187 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
188 Income tax paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
189 Net cash provided by operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
190 Cash flows from investing activities: Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
191 Cash inflows from investing activities: Abstract skm:CashInflowFromInvestingActivitiesAbstract
192 Decrease in short-term financial instruments, net Concept (Monetary) For Period Debit skm:ProceedsFromSalesOrMaturityOfShorttermFinancialInstrumentsClassifiedAsInvestingActivities
193 Collection of short-term loans Concept (Monetary) For Period Debit skm:ProceedsFromShortTermLoans
194 Decrease in long-term financial instruments Concept (Monetary) For Period Debit skm:ProceedsFromSalesOrMaturityOfLongtermFinancialInstrumentsClassifiedAsInvestingActivities
195 Proceeds from disposals of long-term investment securities Concept (Monetary) For Period Debit skm:ProceedsFromDisposalsOfLongtermInvestmentSecurities
196 Proceeds from disposals of investments in associates and joint ventures Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
197 Proceeds from disposals of property and equipment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
198 Proceeds from disposals of intangible assets Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities
199 Collection of long-term loans Concept (Monetary) For Period Debit skm:ProceedsFromLongTermLoans
200 Decrease in deposits Concept (Monetary) For Period Debit skm:DecreaseInDepositsClassifiedAsInvestingActivities
201 Proceeds from disposals of other non-current assets Concept (Monetary) For Period Debit ifrs-full:ProceedsFromOtherLongtermAssetsClassifiedAsInvestingActivities
202 Proceeds from disposals of subsidiaries Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
203 Cash inflow from business combination Concept (Monetary) For Period Debit ifrs-full:CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013
204 Receipt of government grants Concept (Monetary) For Period Debit ifrs-full:ProceedsFromGovernmentGrantsClassifiedAsInvestingActivities
205 Sub-total Concept (Monetary) For Period Debit ifrs-full:InflowsOfCashFromInvestingActivities
206 Cash outflows for investing activities: Abstract skm:CashOutflowFromInvestingActivitiesAbstract
207 Increase in short-term financial instruments, net Concept (Monetary) For Period Credit skm:PurchaseOfShorttermFinancialInstrumentsClassifiedAsInvestingActivities
208 Increase in short-term investment securities, net Concept (Monetary) For Period Credit skm:PurchaseOfShorttermInvestmentSecurities
209 Increase in short-term loans Concept (Monetary) For Period Credit skm:IncreaseInShorttermLoans
210 Increase in long-term loans Concept (Monetary) For Period Credit skm:IncreaseInLongTermLoans
211 Increase in long-term financial instruments Concept (Monetary) For Period Credit skm:PurchaseOfLongtermFinancialInstrumentsClassifiedAsInvestingActivities
212 Acquisitions of long-term investment securities Concept (Monetary) For Period Credit skm:PurchaseOfLongtermInvestmentSecurities
213 Acquisitions of investments in associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
214 Acquisitions of property and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
215 Acquisitions of intangible assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
216 Increase in deposits Concept (Monetary) For Period Credit skm:IncreaseInDeposits
217 Increase in other non-current assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities
218 Cash outflow for business combination Concept (Monetary) For Period Credit skm:CashFlowsUsedInObtainingControlOfSubsidiariesClassifiedAsInvestingActivities
219 Cash outflow for disposal and liquidation of subsidiaries Concept (Monetary) For Period Credit skm:CashFlowsUsedInLiquidationOfSubsidiary
220 Sub-total Concept (Monetary) For Period Credit ifrs-full:OutflowsOfCashFromInvestingActivities
221 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
222 Cash flows from financing activities: Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
223 Cash inflows from financing activities: Abstract skm:CashInflowFromFinancingActivitiesAbstract
224 Proceeds from short-term borrowings, net Concept (Monetary) For Period Debit ifrs-full:ProceedsFromCurrentBorrowings
225 Proceeds from issuance of debentures Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
226 Proceeds from long-term borrowings Concept (Monetary) For Period Debit ifrs-full:ProceedsFromNoncurrentBorrowings
227 Proceeds from issuance of hybrid bonds Concept (Monetary) For Period Debit skm:ProceedsFromIssuanceOfHybridBonds
228 Cash inflows from settlement of derivatives Concept (Monetary) For Period Debit skm:CashInflowsFromSettlementOfDerivatives
229 Cash received from transfer of interests in subsidiaries to non-controlling interests Concept (Monetary) For Period Debit ifrs-full:ProceedsFromContributionsOfNoncontrollingInterests
230 Sub-total Concept (Monetary) For Period Debit skm:CashInflowFromFinancingActivities
231 Cash outflows for financing activities: Abstract skm:CashOutflowFromFinancingActivitiesAbstract
232 Decrease in short-term borrowings, net Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfCurrentBorrowings
233 Repayments of long-term account payables-other Concept (Monetary) For Period Credit skm:RepaymentsOfLongtermAccountPayablesOther
234 Repayments of debentures Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
235 Repayments of long-term borrowings Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfNoncurrentBorrowings
236 Repayments of hybrid bonds Concept (Monetary) For Period Credit skm:RepaymentOfHybridBonds
237 Cash outflows from settlement of derivatives Concept (Monetary) For Period Credit skm:CashOutflowsFromSettlementOfDerivatives
238 Payments of finance lease liabilities Concept (Monetary) For Period Credit ifrs-full:PaymentsOfFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
239 Payments of dividends Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
240 Payments of interest on hybrid bonds Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
241 Transactions with non-controlling shareholders Concept (Monetary) For Period Credit skm:PaymentsFromTransactionsWithNoncontrollingShareholders
242 Sub-total Concept (Monetary) For Period Credit skm:CashOutflowFromFinancingActivities
243 Net cash used in financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
244 Net increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
245 Cash and cash equivalents at beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
246 Effects of exchange rate changes on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
247 Cash and cash equivalents at end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
248 1008 - Disclosure - Reporting Entity Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfGeneralInformationAboutReportingEntityExplanatory
249 Implied Table Table

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250 Text block [abstract] Abstract skm:TextBlockAbstract
251 Reporting Entity Concept (Text Block (HTML)) For Period skm:DisclosureOfGeneralInformationAboutReportingEntityExplanatory
252 1009 - Disclosure - Basis of Preparation Network

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253 Implied Table Table

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254 Text block [abstract] Abstract skm:TextBlockAbstract
255 Basis of Preparation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
256 1010 - Disclosure - Changes in accounting policies Network

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257 Implied Table Table

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258 Text block [abstract] Abstract skm:TextBlockAbstract
259 Changes in accounting policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
260 1011 - Disclosure - Significant Accounting Policies Network

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261 Implied Table Table

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262 Text block [abstract] Abstract skm:TextBlockAbstract
263 Significant Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
264 1012 - Disclosure - Operating Segments Network

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265 Implied Table Table

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266 Text block [abstract] Abstract skm:TextBlockAbstract
267 Operating Segments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
268 1013 - Disclosure - Restricted Deposits Network

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269 Implied Table Table

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270 Text block [abstract] Abstract skm:TextBlockAbstract
271 Restricted Deposits Concept (Text Block (HTML)) For Period skm:DisclosureOfRestrictedDepositsExplanatory
272 1014 - Disclosure - Trade and Other Receivables Network

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273 Implied Table Table

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274 Text block [abstract] Abstract skm:TextBlockAbstract
275 Trade and Other Receivables Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
276 1015 - Disclosure - Prepaid expenses Network

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277 Implied Table Table

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278 Text block [abstract] Abstract skm:TextBlockAbstract
279 Prepaid expenses Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutPrepaidExpensesExplanatory
280 1016 - Disclosure - Contract assets and liabilities Network

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281 Implied Table Table

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282 Text block [abstract] Abstract skm:TextBlockAbstract
283 Contract assets and liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
284 1017 - Disclosure - Inventories Network

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285 Implied Table Table

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286 Text block [abstract] Abstract skm:TextBlockAbstract
287 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
288 1018 - Disclosure - Investment Securities Network

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289 Implied Table Table

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290 Text block [abstract] Abstract skm:TextBlockAbstract
291 Investment Securities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory
292 1019 - Disclosure - Business Combinations Network

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293 Implied Table Table

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294 Text block [abstract] Abstract skm:TextBlockAbstract
295 Business Combinations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
296 1020 - Disclosure - Investments in Associates and Joint Ventures Network

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297 Implied Table Table

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298 Text block [abstract] Abstract skm:TextBlockAbstract
299 Investments in Associates and Joint Ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory
300 1021 - Disclosure - Property and Equipment Network

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301 Implied Table Table

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302 Text block [abstract] Abstract skm:TextBlockAbstract
303 Property and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
304 1022 - Disclosure - Goodwill Network

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305 Implied Table Table

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306 Text block [abstract] Abstract skm:TextBlockAbstract
307 Goodwill Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
308 1023 - Disclosure - Intangible Assets Network

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309 Implied Table Table

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310 Text block [abstract] Abstract skm:TextBlockAbstract
311 Intangible Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
312 1024 - Disclosure - Borrowings and Debentures Network

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313 Implied Table Table

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314 Text block [abstract] Abstract skm:TextBlockAbstract
315 Borrowings and Debentures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
316 1025 - Disclosure - Long-term Payables - other Network

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317 Implied Table Table

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318 Text block [abstract] Abstract skm:TextBlockAbstract
319 Long-term Payables - other Concept (Text Block (HTML)) For Period skm:DisclosureOfLongtermPayablesOtherExplanatory
320 1026 - Disclosure - Provisions Network

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321 Implied Table Table

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322 Text block [abstract] Abstract skm:TextBlockAbstract
323 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
324 1027 - Disclosure - Leases Network

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325 Implied Table Table

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326 Text block [abstract] Abstract skm:TextBlockAbstract
327 Leases Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfLeasesExplanatory
328 1028 - Disclosure - Defined Benefit Liabilities (Assets) Network

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329 Implied Table Table

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330 Text block [abstract] Abstract skm:TextBlockAbstract
331 Defined Benefit Liabilities (Assets) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
332 1029 - Disclosure - Derivative Instruments Network

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333 Implied Table Table

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334 Text block [abstract] Abstract skm:TextBlockAbstract
335 Derivative Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDerivativeFinancialInstrumentsExplanatory
336 1030 - Disclosure - Share Capital and Capital Surplus (deficit) and Others Network

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337 Implied Table Table

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338 Text block [abstract] Abstract skm:TextBlockAbstract
339 Share Capital and Capital Surplus (deficit) and Others Concept (Text Block (HTML)) For Period skm:DisclosureOfShareCapitalAndCapitalSurplusDeficitAndOthersExplanatory
340 1031 - Disclosure - Treasury Shares Network

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341 Implied Table Table

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342 Text block [abstract] Abstract skm:TextBlockAbstract
343 Treasury Shares Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTreasurySharesExplanatory
344 1032 - Disclosure - Hybrid Bonds Network

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345 Implied Table Table

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346 Text block [abstract] Abstract skm:TextBlockAbstract
347 Hybrid Bonds Concept (Text Block (HTML)) For Period skm:DisclosureOfHybridBondsExplanatory
348 1033 - Disclosure - Share option Network

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349 Implied Table Table

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350 Text block [abstract] Abstract skm:TextBlockAbstract
351 Share option Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
352 1034 - Disclosure - Retained Earnings Network

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353 Implied Table Table

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354 Text block [abstract] Abstract skm:TextBlockAbstract
355 Retained Earnings Concept (Text Block (HTML)) For Period skm:DisclosureOfRetainedEarningsExplanatory
356 1035 - Disclosure - Reserves Network

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357 Implied Table Table

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358 Text block [abstract] Abstract skm:TextBlockAbstract
359 Reserves Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
360 1036 - Disclosure - Redeemable Convertible Preferred Stocks Network

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361 Implied Table Table

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362 Text block [abstract] Abstract skm:TextBlockAbstract
363 Redeemable Convertible Preferred Stocks Concept (Text Block (HTML)) For Period skm:DescriptionRedeemableConvertiblePreferredStocksExplanatory
364 1037 - Disclosure - Other Operating Income and Expenses Network

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365 Implied Table Table

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366 Text block [abstract] Abstract skm:TextBlockAbstract
367 Other Operating Income and Expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExpenseExplanatory
368 1038 - Disclosure - Finance Income and Costs Network

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369 Implied Table Table

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370 Text block [abstract] Abstract skm:TextBlockAbstract
371 Finance Income and Costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
372 1039 - Disclosure - Income Tax Expense Network

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373 Implied Table Table

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374 Text block [abstract] Abstract skm:TextBlockAbstract
375 Income Tax Expense Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
376 1040 - Disclosure - Earnings per Share Network

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377 Implied Table Table

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378 Text block [abstract] Abstract skm:TextBlockAbstract
379 Earnings per Share Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
380 1041 - Disclosure - Dividends Network

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381 Implied Table Table

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382 Text block [abstract] Abstract skm:TextBlockAbstract
383 Dividends Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDividendsExplanatory
384 1042 - Disclosure - Categories of Financial Instruments Network

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385 Implied Table Table

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386 Text block [abstract] Abstract skm:TextBlockAbstract
387 Categories of Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
388 1043 - Disclosure - Financial Risk Management Network

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389 Implied Table Table

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390 Text block [abstract] Abstract skm:TextBlockAbstract
391 Financial Risk Management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
392 1044 - Disclosure - Transactions with Related Parties Network

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393 Implied Table Table

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394 Text block [abstract] Abstract skm:TextBlockAbstract
395 Transactions with Related Parties Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
396 1045 - Disclosure - Commitments and Contingencies Network

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397 Implied Table Table

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398 Text block [abstract] Abstract skm:TextBlockAbstract
399 Commitments and Contingencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
400 1046 - Disclosure - Statements of Cash Flows Network

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401 Implied Table Table

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402 Text block [abstract] Abstract skm:TextBlockAbstract
403 Statements of Cash Flows Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
404 1047 - Disclosure - Cash Dividends paid to the Parent Company Network

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405 Implied Table Table

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406 Text block [abstract] Abstract skm:TextBlockAbstract
407 Cash Dividends paid to the Parent Company Concept (Text Block (HTML)) For Period skm:DisclosureOfDividendsPaidToTheParentCompanyExplanatory
408 1048 - Disclosure - Significant Accounting Policies (Policies) Network

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409 Statement [table] Table

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 skm:StatementTable
410 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
411 Currently stated [member] Member ifrs-full:RestatedMember
412 Previously stated [member] Member ifrs-full:PreviouslyStatedMember
413 Statement [LineItems] LineItems skm:StatementLineItems
414 Operating segments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
415 Basis of consolidation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
416 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
417 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
418 Financial assets - Policies applicable from January 1, 2018 Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
419 Impairment of financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
420 Property and equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
421 Borrowing costs Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory
422 Intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
423 Government grants Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
424 Investment property Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory
425 Impairment of non-financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
426 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
427 Non-current assets held for sale Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
428 Non-derivative financial liabilities Concept (Text Block (HTML)) For Period skm:DescriptionOfAccountingPolicyForNonderivativeFinancialLiabilitiesExplanatory
429 Employee benefits Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
430 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
431 Transactions in foreign currencies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
432 Share capital Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
433 Hybrid bond Concept (Text Block (HTML)) For Period skm:DescriptionOfAccountingPolicyForHybridBondExplanatory
434 Share-based Payment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
435 Revenue Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
436 Finance income and finance costs Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory
437 Income taxes Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
438 Earnings per share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
439 Standards issued but not yet effective Concept (Text Block (HTML)) For Period skm:DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatory
440 1049 - Disclosure - Reporting Entity (Tables) Network

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441 Implied Table Table

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442 Text block [abstract] Abstract skm:TextBlockAbstract
443 Total issued shares held by shareholders Concept (Text Block (HTML)) For Period skm:DisclosureOfIssuedSharesHeldByShareholdersExplanatory
444 List of subsidiaries Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
445 Condensed financial information of the significant subsidiaries Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
446 Information of significant non-controlling interests of the group Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNoncontrollingInterestsExplanatory
447 1050 - Disclosure - Changes in accounting policies (Tables) Network

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448 Implied Table Table

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449 Text block [abstract] Abstract skm:TextBlockAbstract
450 Summary of Impact of Transition to IFRS 9 on Opening Balance of Reserves and Retained Earnings Concept (Text Block (HTML)) For Period skm:DisclosureOfImpactNetOfTaxOfTransitionToIFRS9OnReservesAndRetainedEarningsExplanatory
451 Summary of Effects Resulting from Classification and Measurement of Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReclassificationOfFinancialInstrumentsExplanatory
452 Summary of Impacts of Adopting IFRS 15 and 9 on Statement of Financial Position Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
453 1051 - Disclosure - Significant Accounting Policies (Tables) Network

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454 Implied Table Table

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455 Text block [abstract] Abstract skm:TextBlockAbstract
456 Estimated useful lives of the Group's property and equipment Concept (Text Block (HTML)) For Period skm:DisclosureOfPropertyPlantAndEquipmentEstimatedUsefulLivesExplanatory
457 Estimated useful lives of the Group's intangible assets Concept (Text Block (HTML)) For Period skm:DisclosureOfIntangibleAssetsEstimatedUsefulLifeExplanatory
458 1052 - Disclosure - Operating Segments (Tables) Network

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459 Implied Table Table

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460 Text block [abstract] Abstract skm:TextBlockAbstract
461 Segment information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
462 Reconciliation of total segment operating income to consolidated operating profit from continuing operations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProfitLossFromOperatingActivitiesExplanatory
463 Summary of Disaggregation of Operating Revenue Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory
464 1053 - Disclosure - Restricted Deposits (Tables) Network

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465 Implied Table Table

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466 Text block [abstract] Abstract skm:TextBlockAbstract
467 Deposits which are restricted in use Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutRestrictedDepositsExplanatory
468 1054 - Disclosure - Categories of Financial Instruments (Tables) Network

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469 Statement [table] Table

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470 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
471 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
472 Trade and other receivables [member] Member skm:TradeAndOtherReceivableMember
473 Statement [LineItems] LineItems skm:StatementLineItems
474 Summary of financial assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsExplanatory
475 Summary of financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialLiabilitiesExplanatory
476 1055 - Disclosure - Trade and Other Receivables (Tables) Network

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477 Implied Table Table

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478 Text block [abstract] Abstract skm:TextBlockAbstract
479 Changes in Loss Allowance on Accounts Receivable - Trade Measured at Amortized Costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAllowanceForCreditLossesExplanatory
480 Summary of Loss Allowance on Accounts Receivable - Trade Concept (Text Block (HTML)) For Period skm:DisclosureOfLossAllowanceOnAccountsReceivableTradeExplanatory
481 1056 - Disclosure - Prepaid expenses (Tables) Network

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482 Implied Table Table

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483 Text block [abstract] Abstract skm:TextBlockAbstract
484 Summary of Prepaid Expenses Concept (Text Block (HTML)) For Period skm:DisclosureOfPrepaidExpensesExplanatory
485 Summary of Incremental Costs of Obtaining Contracts That Capitalized as Assets and Related Amortization Recognized as Commissions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersExplanatory
486 1057 - Disclosure - Contract assets and liabilities (Tables) Network

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487 Implied Table Table

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488 Text block [abstract] Abstract skm:TextBlockAbstract
489 Schedule of Contract Assets and Liabilities Concept (Text Block (HTML)) For Period skm:DisclosureOfRevenueFromContractsWithCustomersAndRelevantContractAssetsAndLiabilitiesExplanatory
490 1058 - Disclosure - Inventories (Tables) Network

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491 Implied Table Table

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492 Text block [abstract] Abstract skm:TextBlockAbstract
493 Details of inventories Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutInventoriesExplanatory
494 Amount of the inventory write-downs charged to the consolidated statement of income and write-off of inventories Concept (Text Block (HTML)) For Period skm:DisclosureOfWritedownsAndWriteoffsOfInventoryExplanatory
495 1059 - Disclosure - Investment Securities (Tables) Network

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496 Statement [table] Table

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497 Maturity [axis] Axis ifrs-full:MaturityAxis
498 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
499 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
500 Later than one year [Member] Member ifrs-full:LaterThanOneYearMember
501 Statement [LineItems] LineItems skm:StatementLineItems
502 Details of investment securities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAvailableforsaleAssetsExplanatory
503 1060 - Disclosure - Business Combinations (Tables) Network

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504 Statement [table] Table

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505 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
506 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
507 Id Quantique SA [member] Member skm:IdQuantiqueSAMember
508 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
509 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
510 Statement [LineItems] LineItems skm:StatementLineItems
511 Summary of Acquiree Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutAcquireeExplanatory
512 Considerations Transferred Identifiable Assets Acquired and Liabilities Assumed at Acquisition Date Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
513 1061 - Disclosure - Investments in Associates and Joint Ventures (Tables) Network

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514 Implied Table Table

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515 Text block [abstract] Abstract skm:TextBlockAbstract
516 Investments in associates and joint ventures accounted for using the equity method Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutInvestmentsInAssociatesAndJointVenturesExplanatory
517 Market price of investments in listed associates Concept (Text Block (HTML)) For Period skm:DisclosureOfMarketPricesOfInvestmentsAccountedForUsingEquityMethodExplanatory
518 Financial information of significant associates Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesExplanatory
519 Condensed financial information of joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfJointVenturesExplanatory
520 Reconciliations of financial information of significant associates to carrying amounts of investments in associates in the consolidated financial statements Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory
521 Details of the changes in investments in associates and joint ventures accounted for using the equity method Concept (Text Block (HTML)) For Period skm:DisclosureOfChangeInInvestmentsInAssociatesAndJointVenturesExplanatory
522 Details of cumulative unrecognized equity method losses Concept (Text Block (HTML)) For Period skm:DisclosureOfCumulativeUnrecognizedEquityMethodLossesExplanatory
523 1062 - Disclosure - Property and Equipment (Tables) Network

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524 Implied Table Table

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525 Text block [abstract] Abstract skm:TextBlockAbstract
526 Summary of property and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
527 Changes in property and equipment Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutChangesInPropertyPlantAndEquipmentExplanatory
528 1063 - Disclosure - Goodwill (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfGoodwillExplanatoryTables
529 Implied Table Table

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530 Text block [abstract] Abstract skm:TextBlockAbstract
531 Summary of goodwill Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutGoodwillExplanatory
532 Details of the changes in goodwill Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillExplanatory
533 1064 - Disclosure - Intangible Assets (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIntangibleAssetsExplanatoryTables
534 Statement [table] Table

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 skm:StatementTable
535 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
536 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
537 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
538 Frequency usage rights [member] Member ifrs-full:BroadcastingRightsMember
539 Statement [LineItems] LineItems skm:StatementLineItems
540 Summary of intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
541 Details of the changes in intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory
542 1065 - Disclosure - Borrowings and Debentures (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfBorrowingsExplanatoryTables
543 Implied Table Table

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544 Text block [abstract] Abstract skm:TextBlockAbstract
545 Short-term borrowings Concept (Text Block (HTML)) For Period skm:ScheduleOfShorttermBorrowingsExplanatory
546 Long-term borrowings Concept (Text Block (HTML)) For Period skm:ScheduleOfLongtermBorrowingsExplanatory
547 Debentures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDebtSecuritiesExplanatory
548 1066 - Disclosure - Long-term Payables - other (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfLongtermPayablesOtherExplanatoryTables
549 Implied Table Table

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550 Text block [abstract] Abstract skm:TextBlockAbstract
551 Summary of Long-term payables - other Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
552 Summary of Long-term payables - other Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutLongtermPayablesOtherExplanatory
553 Repayment schedule of the principal amount of long-term payables - other related to acquisition of frequency usage rights Concept (Text Block (HTML)) For Period skm:DisclosureOfMaturityAnalysisOfLongtermPayablesOtherExplanatory
554 1067 - Disclosure - Provisions (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherProvisionsExplanatoryTables
555 Implied Table Table

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556 Text block [abstract] Abstract skm:TextBlockAbstract
557 Changes in provisions Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutOtherProvisionsExplanatory
558 1068 - Disclosure - Leases (Tables) Network

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*

 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfLeasesExplanatoryTables
559 Implied Table Table

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560 Text block [abstract] Abstract skm:TextBlockAbstract
561 Expected future lease payments Concept (Text Block (HTML)) For Period skm:DisclosureOfExpectedFutureLeasePaymentsAndLeaseRevenuesOperatingLeaseExplanatory
562 1069 - Disclosure - Defined Benefit Liabilities (Assets) (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEmployeeBenefitsExplanatoryTables
563 Statement [table] Table

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 skm:StatementTable
564 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
565 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
566 Retirement benefit obligation [Member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
567 Plan assets [member] Member ifrs-full:PlanAssetsMember
568 Statement [LineItems] LineItems skm:StatementLineItems
569 Details of defined benefit liabilities (assets) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
570 Principal actuarial assumptions Concept (Text Block (HTML)) For Period skm:DisclosureOfPrincipalActuarialAssumptionsExplanatory
571 Changes in defined benefit liabilities (assets) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
572 Cost of benefit plan recognized in profit and loss Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAdditionalInformationAboutDefinedBenefitPlansExplanatory
573 Details of plan assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
574 Effects on defined benefit obligations if each of significant actuarial assumptions changes within expectable and reasonable range Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
575 1070 - Disclosure - Derivative Instruments (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatoryTables
576 Implied Table Table

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577 Text block [abstract] Abstract skm:TextBlockAbstract
578 Currency and interest rate swap contracts under cash flow hedge accounting Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfHedgeAccountingExplanatory
579 Details of fair values of the above derivatives recorded in assets or liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory
580 1071 - Disclosure - Share Capital and Capital Surplus (deficit) and Others (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfShareCapitalAndCapitalSurplusDeficitAndOthersExplanatoryTables
581 Implied Table Table

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 implied:Table
582 Text block [abstract] Abstract skm:TextBlockAbstract
583 Number of authorized, issued and outstanding common shares and the details of capital surplus and others Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutShareCapitalAndCapitalSurplusDeficitAndOthersExplanatory
584 Details of shares outstanding Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
585 1072 - Disclosure - Treasury Shares (Tables) Network

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*

 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfTreasurySharesExplanatoryTables
586 Implied Table Table

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 implied:Table
587 Text block [abstract] Abstract skm:TextBlockAbstract
588 Summary of treasury share Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationOfTreasurySharesExplanatory
589 1073 - Disclosure - Hybrid Bonds (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfHybridBondsExplanatoryTables
590 Implied Table Table

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591 Text block [abstract] Abstract skm:TextBlockAbstract
592 Summary of hybrid bonds Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutHybridBondsExplanatory
593 1074 - Disclosure - Share option (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSharebasedPaymentArrangementsExplanatoryTables
594 Implied Table Table

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595 Text block [abstract] Abstract skm:TextBlockAbstract
596 Summary of Terms and Conditions Related to Grants of Share Options under Share Option Program Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory
597 Summary of Share Compensation Expense Recognized Concept (Text Block (HTML)) For Period skm:DisclosureOfShareBasedCompensationExpenseExplanatory
598 Summary of Inputs Used in Binomial Option Pricing Model Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
599 1075 - Disclosure - Retained Earnings (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfRetainedEarningsExplanatoryTables
600 Implied Table Table

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601 Text block [abstract] Abstract skm:TextBlockAbstract
602 Summary of retained earnings Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutRetainedEarningsExplanatory
603 1076 - Disclosure - Reserves (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfReservesAndOtherEquityInterestExplanatoryTables
604 Statement [table] Table

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 skm:StatementTable
605 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
606 Equity [member] Member ifrs-full:EquityMember
607 Valuation gain (loss) on available-for-sale financial assets [Member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
608 Valuation gain (loss) on derivatives [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
609 Statement [LineItems] LineItems skm:StatementLineItems
610 Details of reserves, net of taxes Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutReservesExplanatory
611 Changes in reserves Concept (Text Block (HTML)) For Period skm:DisclosureOfChangesInReservesExplanatory
612 1077 - Disclosure - Redeemable Convertible Preferred Stocks (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDescriptionRedeemableConvertiblePreferredStocksExplanatoryTables
613 Implied Table Table

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614 Text block [abstract] Abstract skm:TextBlockAbstract
615 Summary of redeemable convertible preferred stocks Concept (Text Block (HTML)) For Period skm:DisclosureOfRedeemableConvertiblePreferredStocksExplanatory
616 1078 - Disclosure - Other Operating Income and Expenses (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherOperatingIncomeExpenseExplanatoryTables
617 Implied Table Table

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618 Text block [abstract] Abstract skm:TextBlockAbstract
619 Details of other operating income and expenses Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutOtherOperatingIncomeAndExpensesExplanatory
620 1079 - Disclosure - Finance Income and Costs (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinanceIncomeExpenseExplanatoryTables
621 Implied Table Table

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622 Text block [abstract] Abstract skm:TextBlockAbstract
623 Details of finance income and costs Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutFinanceIncomeExpenseExplanatory
624 Details of interest income included in finance income Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestIncomeExplanatory
625 Details of interest expenses included in finance costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestExpenseExplanatory
626 Finance income and costs by category of financial instruments Concept (Text Block (HTML)) For Period skm:DisclosureOfFinanceIncomeAndCostsByCategoryOfFinancialInstrumentsExplanatory
627 Details of impairment losses for financial assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfImpairmentOfAssetsExplanatory
628 1080 - Disclosure - Income Tax Expense (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTables
629 Implied Table Table

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630 Text block [abstract] Abstract skm:TextBlockAbstract
631 Summary of income tax expenses Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutIncomeTaxExplanatory
632 Difference between income taxes computed using the statutory corporate income tax rates and the recorded income taxes Concept (Text Block (HTML)) For Period skm:DisclosureOfReconciliationOfEffectiveAndApplicableIncomeTaxExpensesExplanatory
633 Deferred taxes directly charged to (credited from) equity Concept (Text Block (HTML)) For Period skm:DisclosureOfDeferredTaxesDirectlyChargedToCreditedFromEquityExplanatory
634 Details of the changes in deferred tax assets (liabilities) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
635 Details of temporary differences, unused tax loss carryforwards and unused tax credits carryforwards which are not recognized as deferred tax assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
636 Unused tax loss carryforwards and unused tax credit carryforwards which are not recognized as deferred tax assets Concept (Text Block (HTML)) For Period skm:DisclosureOfAmountOfUnusedTaxLossCarryforwardsAndUnusedTaxCreditCarryforwardsNotRecognizedAsDeferredTaxAssetsExplanatory
637 1081 - Disclosure - Earnings per Share (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTables
638 Implied Table Table

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639 Text block [abstract] Abstract skm:TextBlockAbstract
640 Summary of basic earnings per share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
641 Weighted average number of common shares outstanding Concept (Text Block (HTML)) For Period skm:DisclosureOfWeightedAverageNumberOfCommonSharesOutstandingExplanatory
642 1082 - Disclosure - Dividends (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDividendsExplanatoryTables
643 Implied Table Table

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644 Text block [abstract] Abstract skm:TextBlockAbstract
645 Details of dividend declared Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutDividendsExplanatory
646 Dividends yield ratios Concept (Text Block (HTML)) For Period skm:DisclosureOfDividendsYieldRatiosExplanatory
647 1083 - Disclosure - Financial Risk Management (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatoryTables
648 Statement [table] Table

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 skm:StatementTable
649 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
650 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
651 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
652 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
653 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
654 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
655 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
656 Risks [member] Member ifrs-full:TypesOfRisksMember
657 Currency risk [member] Member ifrs-full:CurrencyRiskMember
658 Statement [LineItems] LineItems skm:StatementLineItems
659 Monetary assets and liabilities denominated in foreign currencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfMarketRiskExplanatory
660 Impact on income before income tax of a hypothetical change in exchange rates Concept (Text Block (HTML)) For Period ifrs-full:SensitivityAnalysisForEachTypeOfMarketRisk
661 Maximum credit exposure Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCreditRiskExposureExplanatory
662 Summary of gross carrying amounts of each financial asset except for accounts receivable trade and derivative financial asset Concept (Text Block (HTML)) For Period skm:DisclosureOfGrossCarryingAmountsOfEachFinancialAssetExceptForAccountsReceivableTradeAndDerivativeFinancialAssetExplanatory
663 Summary of changes in loss allowance for debt investments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsExplanatory
664 Contractual maturities of financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
665 Periods in which cash flows from cash flow hedge derivatives are expected to occur Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForDerivativeFinancialLiabilities
666 Debt-equity ratio Concept (Text Block (HTML)) For Period skm:DisclosureOfDebtEquityRatioExplanatory
667 Fair value and carrying amount of financial assets and liabilities including fair value hierarchy Concept (Text Block (HTML)) For Period skm:DisclosureOfFinancialAssetsAndFinancialLiabilitiesExplanatory
668 Interest rates used by the group for the fair value measurement Concept (Text Block (HTML)) For Period skm:DisclosureOfFairValueMeasurementInterestRatesExplanatory
669 Fair value of assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementOfAssetsExplanatory
670 Significant inputs for fair value measurement and inter-relationship between inputs and fair value measured Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory
671 Carrying amount of financial instruments recognized of which offset agreements are applicable Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory
672 1084 - Disclosure - Transactions with Related Parties (Tables) Network

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673 Implied Table Table

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674 Text block [abstract] Abstract skm:TextBlockAbstract
675 Compensation for the key management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
676 Transactions with related parties Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
677 Account balances with related parties Concept (Text Block (HTML)) For Period skm:DisclosureOfAccountBalancesWithRelatedPartiesExplanatory
678 1085 - Disclosure - Statements of Cash Flows (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTables
679 Implied Table Table

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680 Text block [abstract] Abstract skm:TextBlockAbstract
681 Adjustments for income and expenses from operating activities Concept (Text Block (HTML)) For Period skm:DisclosureOfAdjustmentsForIncomeAndExpensesFromOperatingActivitiesExplanatory
682 Changes in assets and liabilities from operating activities Concept (Text Block (HTML)) For Period skm:DisclosureOfChangesInAssetsAndLiabilitiesFromOperatingActivitiesExplanatory
683 Significant non-cash transactions Concept (Text Block (HTML)) For Period skm:DisclosureOfSignificantNoncashTransactionsExplanatory
684 Reconciliation of Lliabilities Arising from Financing Activities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
685 1086 - Disclosure - Cash Dividends paid to the Parent Company (Tables) Network

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 http://www.sktelecom.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDividendsPaidToTheParentCompanyExplanatoryTables
686 Implied Table Table

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687 Text block [abstract] Abstract skm:TextBlockAbstract
688 Summary of Cash Dividends Received from Consolidated Subsidiaries and Associates Concept (Text Block (HTML)) For Period skm:DisclosureOfDetailedInformationAboutDividendsPaidToTheParentCompanyExplanatory
689 1087 - Disclosure - Reporting Entity - Total Issued Shares Held by Shareholders (Detail) Network

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 http://www.sktelecom.com/taxonomy/role/DisclosureReportingEntityTotalIssuedSharesHeldByShareholders
690 Disclosure of classes of share capital [table] Table

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 ifrs-full:DisclosureOfClassesOfShareCapitalTable
691 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
692 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
693 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
694 National pension service [member] Member skm:NationalPensionServiceMember
695 Institutional investors and other minority shareholders [member] Member skm:InstitutionalInvestorsAndOtherMinorityShareholdersMember
696 Treasury shares [member] Member ifrs-full:TreasurySharesMember
697 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
698 Number of shares Concept (Shares) As Of skm:NumberOfSharesOwned
699 Percentage of total shares issued (%) Concept (Percent) As Of skm:PercentageOfSharesIssued
700 1088 - Disclosure - Reporting Entity - List of Subsidiaries (Detail) Network

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701 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
702 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
703 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
704 SK Telink Co., Ltd. [member] Member skm:SKTelinkCoLtdMember
705 SK Communications Co., Ltd. [member] Member skm:SKCommunicationsCoLtdMember
706 SK Broadband Co., Ltd. [member] Member skm:SKBroadbandCoLtdMember
707 PS&Marketing Corporation [member] Member skm:PSAndMarketingCorporationMember
708 SERVICE ACE Co., Ltd. [member] Member skm:SERVICEACECoLtdMember
709 SERVICE TOP Co., Ltd. [member] Member skm:SERVICETOPCoLtdMember
710 Network O&S Co., Ltd. [member] Member skm:NetworkOAndSMember
711 SK Planet Co., Ltd. [member] Member skm:SKPlanetCoLtdMember
712 Eleven Street Co., Ltd. [member] Member skm:ElevenStreetCoLtdMember
713 Iriver Limted [member] Member skm:IRIVERLIMITEDMember
714 SK Telecom China Holdings Co., Ltd. [member] Member skm:SKTelecomChinaHoldingsCoLtdMember
715 SK Global Healthcare Business Group, Ltd. [member] Member skm:SKGlobalHealthcareBusinessGroupLtdMember
716 SKT Vietnam PTE. Ltd. [member] Member skm:SKTVietnamPTELtdMember
717 SKT Americas, Inc. [member] Member skm:SKTAmericasIncMember
718 YTK Investment Ltd. [member] Member skm:YTKInvestmentLtdMember
719 Atlas investment [member] Member skm:AtlasInvestmentMember
720 SK techx Co., Ltd. [member] Member skm:SKtechxCoLtdMember
721 One Store Co., Ltd. [member] Member skm:OneStoreCoLtdMember
722 SK Telecom Japan Inc. [member] Member skm:SkTelecomJapanIncMember
723 Id Quantique SA [member] Member skm:IdQuantiqueSAMember
724 Quantum Innovation Fund I [member] Member skm:QuantumInnovationFundIMember
725 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
726 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
727 SK m&service Co., Ltd [member] Member skm:SKmandserviceCoLtdMember
728 SK Planet Japan, K. K. [member] Member skm:SKPlanetJapanKKMember
729 SK Planet Global PTE. Ltd. [member] Member skm:SKPlanetGlobalPTELtdMember
730 SKP GLOBAL HOLDINGS PTE. LTD. [member] Member skm:SKPGLOBALHOLDINGSPTELTDMember
731 SKP America LLC. [member] Member skm:SKPAmericaLLCMember
732 shopkick Management Company, Inc. [member] Member skm:shopkickManagementCompanyIncMember
733 shopkick, Inc. [member] Member skm:shopkickIncMember
734 11street [member] Member skm:ElevenstreetThailandCoLtdMember
735 K-net culture and contents venture fund [member] Member skm:KnetCultureAndContentsVentureFundMember
736 Hello Nature Ltd. [member] Member skm:HelloNatureLtdMember
737 iriver Enterprise Ltd. [member] Member skm:iriverEnterpriseLtdMember
738 iriver Inc. [member] Member skm:iriverIncMember
739 iriver China Co., Ltd. [member] Member skm:iriverChinaCoLtdMember
740 Dongguan iriver Electronics Co., Ltd. [member] Member skm:DongguaniriverElectronicsCoLtdMember
741 groovers Japan Co., Ltd. [member] Member skm:grooversJPLtdMember
742 LIFE DESIGN COMPANY Inc. [member] Member skm:LifeDesignCompanyIncMember
743 S.M. Mobile Communications JAPAN Inc [member] Member skm:SMMobileCommunicationsJapanIncMember
744 Groovers Inc. [member] Member skm:GrooversIncMember
745 NSOK Co., Ltd [member] Member skm:NSOKCoLtdMember
746 SK TELINK VIETNAM Co., Ltd. [member] Member skm:SKTELINKVIETNAMCoLtdMember
747 ADT CAPS Co., Ltd. [member] Member skm:ADTCAPSCoLtdMember
748 CAPSTEC Co., Ltd. [member] Member skm:CAPSTECCoLtdMember
749 ADT SECURITY Co., Ltd. [member] Member skm:ADTSECURITYCoLtdMember
750 Id Quantique LLC [member] Member skm:IdQuantiqueLlcMember
751 Home and Service Co., Ltd [member] Member skm:HomeAndServiceCoLtdMember
752 SK stoa Co., Ltd [member] Member skm:SKstoaCoLtdMember
753 SK Telecom Innovation Fund, L.P. (formerly, Technology Innovation Partners, L.P.) [member] Member skm:SKTelecomInnovationFundLPMember
754 SK Telecom China Fund I L.P. [Member] Member skm:SKTelecomChinaFundILPMember
755 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
756 Subsidiary Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
757 Location Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
758 Primary business Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
759 Ownership Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
760 1089 - Disclosure - Reporting Entity - List of Subsidiaries (Parenthetical) (Detail) Network

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761 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
762 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
763 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
764 Parent [member] Member ifrs-full:ParentMember
765 Subsidiaries [member] Member ifrs-full:SubsidiariesMember
766 Range [axis] Axis ifrs-full:RangeAxis
767 Ranges [member] Member ifrs-full:RangesMember
768 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
769 Top of range [member] Member ifrs-full:TopOfRangeMember
770 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
771 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
772 SK Planet Co., Ltd. [member] Member skm:SKPlanetCoLtdMember
773 Eleven Street Co., Ltd. [member] Member skm:ElevenStreetCoLtdMember
774 H & Q Korea Partners, LLC [member] Member skm:HAndQKoreaPartnersLLCMember
775 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
776 Percentage of shares held Concept (Percent) As Of skm:PercentageOfSharesIssued
777 Number of shares acquired Concept (Shares) As Of skm:NumberOfSharesAcquired
778 Amount of shares acquired Concept (Monetary) As Of Credit ifrs-full:CashTransferred
779 Percentage of shares owned Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
780 Annual dividend rate Concept (Percent) For Period skm:PercentageOfDividendPayables
781 Dividends payable recognized as Financial liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentDividendPayables
782 Number of shares new issue Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
783 1090 - Disclosure - Reporting Entity - Condensed Financial Information of the Significant Subsidiaries (Detail) Network

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784 Disclosure of subsidiaries [table] Table

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785 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
786 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
787 SK Telink Co., Ltd. [member] Member skm:SKTelinkCoLtdMember
788 Eleven Street Co., Ltd. [member] Member skm:ElevenStreetCoLtdMember
789 SK m&service Co., Ltd [member] Member skm:SKmandserviceCoLtdMember
790 SK Communications Co., Ltd. [member] Member skm:SKCommunicationsCoLtdMember
791 SK Broadband Co., Ltd. [member] Member skm:SKBroadbandCoLtdMember
792 K-net culture and contents venture fund [member] Member skm:KnetCultureAndContentsVentureFundMember
793 PS&Marketing Corporation [member] Member skm:PSAndMarketingCorporationMember
794 SERVICE ACE Co., Ltd. [member] Member skm:SERVICEACECoLtdMember
795 SERVICE TOP Co., Ltd. [member] Member skm:SERVICETOPCoLtdMember
796 Network O&S Co., Ltd. [member] Member skm:NetworkOAndSMember
797 SK Planet Co., Ltd. [member] Member skm:SKPlanetCoLtdMember
798 Iriver Limted [member] Member skm:IRIVERLIMITEDMember
799 SKT Americas, Inc. [member] Member skm:SKTAmericasIncMember
800 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
801 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
802 One Store Co., Ltd. [member] Member skm:OneStoreCoLtdMember
803 Home and Service Co., Ltd [member] Member skm:HomeAndServiceCoLtdMember
804 SK stoa Co., Ltd [member] Member skm:SKstoaCoLtdMember
805 SK techx Co., Ltd. [member] Member skm:SKtechxCoLtdMember
806 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
807 Total Assets Concept (Monetary) As Of Debit ifrs-full:Assets
808 Total Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
809 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
810 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
811 Profit (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
812 1091 - Disclosure - Reporting Entity - Information of Significant Non-controlling Interests of the Group (Detail) Network

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813 Disclosure of subsidiaries [table] Table

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814 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
815 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
816 K-net culture and contents venture fund [member] Member skm:KnetCultureAndContentsVentureFundMember
817 Iriver Limted [member] Member skm:IRIVERLIMITEDMember
818 SK Communications Co., Ltd. [member] Member skm:SKCommunicationsCoLtdMember
819 One Store Co., Ltd. [member] Member skm:OneStoreCoLtdMember
820 Eleven Street Co., Ltd. [member] Member skm:ElevenStreetCoLtdMember
821 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
822 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
823 Ownership of non-controlling interests (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
824 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
825 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
826 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
827 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
828 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
829 Fair value adjustment and others Concept (Monetary) For Period Credit skm:FairValueAndOtherAdjustmentsOnNetAssets
830 Net assets on the consolidated financial statements Concept (Monetary) As Of Debit skm:NetAssetsLiabilitiesOnFinancialStatements
831 Carrying amount of non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
832 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
833 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
834 Depreciation of the fair value adjustment and others Concept (Monetary) For Period Debit skm:DepreciationAndAmortisationExpenseOfFairValueAdjustmentAndOthers
835 Profit (Loss) for the year on the consolidated financial statements Concept (Monetary) For Period Credit skm:ProfitLossOnFinancialStatements
836 Total comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
837 Loss attributable to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
838 Net cash provided by (used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
839 Net cash provided by (used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
840 Net cash provided by (used in) financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
841 Net increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
842 Dividend paid to non-controlling interests during the year ended December 31, 2018 Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToNoncontrollingInterests
843 1092 - Disclosure - Changes in Accounting Policies - Additional Information (Detail) Network

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844 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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845 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
846 Currently stated [member] Member ifrs-full:RestatedMember
847 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
848 Disclosure of expected impact of initial application of new standards or interpretations [line items] LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
849 Contract liability Concept (Monetary) As Of Credit ifrs-full:ContractLiabilities
850 Considerations allocated to handset sales revenue as contract assets Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractAssets
851 Considerations allocated to handset sales revenue as long-term contract assets Concept (Monetary) For Period Debit skm:IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueLongtermContractAssets
852 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
853 Long-term prepaid expenses Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
854 Advance and unearned revenue Concept (Monetary) As Of Credit skm:AdvancesAndUnearnedRevenue
855 Increase (decrease) in prepaid expenses Concept (Monetary) For Period skm:IncreaseDecreaseInPrepaidExpenses
856 Increase (decrease) in long-term prepaid expenses Concept (Monetary) For Period skm:IncreaseDecreaseInNoncurrentPrepaidExpenses
857 Increase (decrease) in assets Concept (Monetary) For Period Debit skm:IncreaseDecreaseInAssets
858 Increase (decrease) in deferred tax assets Concept (Monetary) For Period Debit skm:IncreaseDecreaseInDeferredTaxAssets
859 Increase (decrease) in contract liabilities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractLiabilities
860 Increase (decrease) in long-term contract liabilities Concept (Monetary) For Period Credit skm:IncreaseDecreaseInContractLiabilitiesNoncurrent
861 Increase (decrease) in deferred tax liabilities Concept (Monetary) For Period Credit skm:IncreaseDecreaseInDeferredTaxLiabilities
862 Increase (decrease) in receipts in advance and unearned revenue Concept (Monetary) For Period skm:IncreaseDecreaseInAdvancesAndUnearnedRevenue
863 Increase (decrease) in liabilities Concept (Monetary) For Period skm:IncreaseDecreaseInLiablities
864 Increase (decrease) in retained earnings Concept (Monetary) For Period Credit skm:IncreaseDecreaseInRetainedEarnings
865 Increase (decrease) in capital surplus and others Concept (Monetary) For Period Credit skm:IncreaseDecreaseInCapitalSurplusAndOthers
866 Increase (decrease) in non-controlling interests Concept (Monetary) For Period Credit skm:IncreaseDecreaseInNoncontrollingInterests
867 Increase (decrease) in revenues Concept (Monetary) For Period Credit skm:IncreaseDecreaseInRevenue
868 Increase (decrease) in advertising expenses Concept (Monetary) For Period Debit skm:IncreaseDecreaseInAdvertisingExpenses
869 Increase (decrease) in commission expenses Concept (Monetary) For Period Debit skm:IncreaseDecreaseInCommissionExpense
870 Increase (decrease) in operating expenses Concept (Monetary) For Period Debit skm:IncreaseDecreaseInOperatingExpense
871 Increase (decrease) in operating profit and profit before income tax Concept (Monetary) For Period Debit skm:IncreaseDecreaseInOperatingProfitAndProfitBeforeTax
872 Increase (decrease) in profit Concept (Monetary) For Period Credit skm:IncreaseDecreaseInProfitLoss
873 Increase (decrease) in income tax expense Concept (Monetary) For Period Credit skm:IncreaseDecreaseInIncomeTaxExpense
874 1093 - Disclosure - Changes in Accounting Policies - Summary of Impact of Transition to IFRS 9 on Opening Balance of Reserves and Retained Earnings (Detail) Network

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875 Disclosure of Impact (net of tax) of transition to IFRS 9 on reserves and retained earnings [table] Table

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876 Effect of overlay approach reclassification [axis] Axis ifrs-full:EffectOfOverlayApproachReclassificationAxis
877 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
878 IFRS9 [member] Member skm:IFRS9Member
879 Disclosure of Impact (net of tax) of transition to IFRS 9 on reserves and retained earnings [line items] LineItems skm:DisclosureOfImpactNetOfTaxOfTransitionToIFRS9OnReservesAndRetainedEarningsLineItems
880 Reclassification of available-for-sale financial assets to financial assets at fair value through profit or loss("FVTPL") Concept (Monetary) As Of Credit skm:ReclassificationOfAvailableForSaleFinancialAssetsToFinancialAssetsAtFairValueThroughProfitOrLossToReserves
881 Reclassification of available-for-sale financial assets to financial assets at fair value through other comprehensive income ("FVOCI") Concept (Monetary) As Of Credit skm:ReclassificationOfAvailableForSaleFinancialAssetsToFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeToReserves
882 Recognition of loss allowances on accounts receivable - trade and others Concept (Monetary) As Of Credit skm:RecognitionOfLossAllowancesOnTradeAndOtherReceivableToReserves
883 Related income tax Concept (Monetary) For Period Credit skm:TaxImpactOnReserves
884 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
885 Reclassification of available-for-sale financial assets to financial assets at fair value through profit or loss("FVTPL") Concept (Monetary) As Of Credit skm:ReclassificationOfAvailableForSaleFinancialAssetsToFinancialAssetsAtFairValueThroughProfitOrLossToRetainedEarnings
886 Reclassification of available-for-sale financial assets to financial assets at fair value through other comprehensive income ("FVOCI") Concept (Monetary) As Of Credit skm:ReclassificationOfAvailableForSaleFinancialAssetsToFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeToRetainedEarnings
887 Recognition of loss allowances on accounts receivable - trade and others Concept (Monetary) As Of Credit skm:RecognitionOfLossAllowancesOnTradeAndOtherReceivableToRetainedEarnings
888 Related income tax Concept (Monetary) For Period Credit skm:TaxImpactOnRetainedProfits
889 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
890 1094 - Disclosure - Changes in Accounting Policies - Summary of Effects Resulting from Classification and Measurement of Financial Instruments (Detail) Network

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891 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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 ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
892 Effect of overlay approach reclassification [axis] Axis ifrs-full:EffectOfOverlayApproachReclassificationAxis
893 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
894 IAS 39 [member] Member skm:IAS39Member
895 IFRS9 [member] Member skm:IFRS9Member
896 Events of reclassification of financial assets [axis] Axis ifrs-full:EventsOfReclassificationOfFinancialAssetsAxis
897 Events of reclassification of financial assets [member] Member ifrs-full:EventsOfReclassificationOfFinancialAssetsMember
898 Financial assets at Amortized cost under IAS 39 reclassified to Financial assets at Amortized cost under IFRS 9 [member] Member skm:FinancialAssetsAtAmortizedCostUnderIAS39ReclassifiedToFinancialAssetsAtAmortizedCostUnderIFRS9Member
899 Financial assets available -for- sale under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
900 Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAtFairValueThroughProfitOrLossUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
901 Financial assets at Amortized cost under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAtAmortizedCostUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
902 Financial assets available -for- sale under IAS 39 reclassified to Financial assets at fair value through other comprehensive income under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeUnderIFRS9Member
903 Derivative financial assets for hedging purpose under IAS 39 reclassified to Derivative financial assets for hedging purpose under IFRS 9 [member] Member skm:DerivativeFinancialAssetsForHedgingPurposeUnderIAS39ReclassifiedToDerivativeFinancialAssetsForHedgingPurposeUnderIFRS9Member
904 Disclosure of expected impact of initial application of new standards or interpretations [line items] LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
905 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
906 Short-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
907 Short-term investment securities Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
908 Accounts receivable - trade Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
909 Short-term loans Concept (Monetary) As Of Debit skm:ShorttermLoansReceivable
910 Accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
911 Accrued revenue Concept (Monetary) As Of Debit ifrs-full:CurrentAccruedIncome
912 Guarantee deposits Concept (Monetary) As Of Debit skm:ShortTermDeposits
913 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
914 Long-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentFinancialAssets
915 Long-term accounts receivable - trade Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivables
916 Long-term loans Concept (Monetary) As Of Debit skm:LongtermLoansReceivable
917 Long-term accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentReceivables
918 Guarantee deposits Concept (Monetary) As Of Debit ifrs-full:LongtermDeposits
919 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
920 Long-term investment securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
921 Non current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
922 Assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
923 1095 - Disclosure - Changes in Accounting Policies - Summary of Effects Resulting from Classification and Measurement of Financial Instruments (Parenthetical) (Detail) Network

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924 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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 ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
925 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
926 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
927 Beneficiary Certificates and equity investments [member] Member skm:BeneficiaryCertificatesAndEquityInvestmentsMember
928 Redeemable convertible preferred stock [member] Member skm:RedeemableConvertiblePreferredStockMember
929 Marketable Equity Securities [member] Member skm:MarketableEquitySecuritiesMember
930 Events of reclassification of financial assets [axis] Axis ifrs-full:EventsOfReclassificationOfFinancialAssetsAxis
931 Events of reclassification of financial assets [member] Member ifrs-full:EventsOfReclassificationOfFinancialAssetsMember
932 Financial assets available -for- sale under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
933 Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAtFairValueThroughProfitOrLossUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
934 Financial assets at Amortized cost under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member] Member skm:FinancialAssetsAtAmortizedCostUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughProfitOrLossUnderIFRS9Member
935 Financial assets available -for- sale under IAS 39 reclassified to Financial assets at fair value through other comprehensive income under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeUnderIFRS9Member
936 Financial assets available -for- sale under IAS 39 reclassified to equity investments at fair value through other comprehensive income under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToEquityInvestmentsAtFairValueThroughOtherComprehensiveIncomeUnderIFRS9Member
937 Financial assets available -for- sale under IAS 39 reclassified to debt instrument at fair value through other comprehensive income under IFRS 9 [member] Member skm:FinancialAssetsAvailableForSaleUnderIAS39ReclassifiedToDebtInstrumentAtFairValueThroughOtherComprehensiveIncomeUnderIFRS9Member
938 Disclosure of expected impact of initial application of new standards or interpretations [line items] LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
939 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
940 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
941 Reclassification of accumulated OCI to retained earnings Concept (Monetary) For Period Debit skm:ReclassificationOfAccumulatedOtherComprehensiveIncomeLossToRetainedEarnings
942 Increase (decrease) in retained earnings Concept (Monetary) For Period Credit skm:IncreaseDecreaseInRetainedEarnings
943 Change in fair value of financial assets recognized in profit before income tax Concept (Monetary) For Period Credit ifrs-full:FairValueGainsLossesOnFinancialAssetsReclassifiedOutOfFinancialAssetsAtFairValueThroughProfitOrLossRecognisedInProfitOrLoss
944 Reclassification of retained earnings to accumulated OCI Concept (Monetary) For Period Debit skm:ReclassificationOfLossFromRetainedEarningsToAccumulatedOtherComprehensiveIncomeLoss
945 Increase (decrease) in accumulated OCI Concept (Monetary) For Period Credit skm:IncreaseDecreaseInAccumulatedOtherComprehensiveIncomeLoss
946 Accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
947 1096 - Disclosure - Changes in Accounting Policies - Summary of Impacts of Adopting IFRS 15 and 9 on Statement of Financial Position (Detail) Network

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948 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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 ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
949 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
950 Currently stated [member] Member ifrs-full:RestatedMember
951 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
952 Increase (decrease) due to application of IFRS 9 [member] Member skm:IncreaseDecreaseDueToApplicationOfIFRS9Member
953 Disclosure of expected impact of initial application of new standards or interpretations [line items] LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
954 Current Assets: Abstract ifrs-full:CurrentAssetsAbstract
955 Accounts receivable - trade, net Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
956 Accounts receivable - other, net Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
957 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
958 Contract assets Concept (Monetary) As Of Debit ifrs-full:CurrentContractAssets
959 Others Concept (Monetary) As Of Debit skm:OtherCurrentAssetsOther
960 Non-CurrentAssets: Abstract ifrs-full:NoncurrentAssetsAbstract
961 Long-term investment securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
962 Long-term prepaid expenses Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
963 Long-term contract assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentContractAssets
964 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
965 Long-term derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
966 Others Concept (Monetary) As Of Debit skm:OtherNonCurrentAssetsOther
967 Total Assets Concept (Monetary) As Of Debit ifrs-full:Assets
968 Current Liabilities: Abstract ifrs-full:CurrentLiabilitiesAbstract
969 Provisions Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
970 Contract liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentContractLiabilities
971 Receipts in advance Concept (Monetary) As Of Credit ifrs-full:CurrentAdvances
972 Unearned revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
973 Withholdings Concept (Monetary) As Of Credit ifrs-full:ShorttermEmployeeBenefitsAccruals
974 Others Concept (Monetary) As Of Credit skm:OtherCurrentLiabilitiesOther
975 Non-CurrentLiabilities: Abstract ifrs-full:NoncurrentLiabilitiesAbstract
976 Long-term contract liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentContractLiabilities
977 Long-term unearned revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
978 Other non-currentliabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
979 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
980 Others Concept (Monetary) As Of Credit skm:OtherNoncurrentLiabilitiesOther
981 Total Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
982 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
983 Capital surplus and others Concept (Monetary) As Of Credit skm:CapitalSurplusAndOthers
984 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
985 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
986 Non-controllinginterests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
987 Total Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:Equity
988 Total Liabilities and Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
989 1097 - Disclosure - Significant Accounting Policies - Estimated Useful Lives of the Group's Property and Equipment (Detail) Network

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990 Disclosure of detailed information about property, plant and equipment [table] Table

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991 Range [axis] Axis ifrs-full:RangeAxis
992 Ranges [member] Member ifrs-full:RangesMember
993 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
994 Top of range [member] Member ifrs-full:TopOfRangeMember
995 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
996 Property and equipment (depreciation) [Member] Member ifrs-full:PropertyPlantAndEquipmentMember
997 Buildings and structures [member] Member skm:BuildingsAndStructuresMember
998 Machinery [member] Member ifrs-full:MachineryMember
999 Other property and equipment [member] Member ifrs-full:OtherPropertyPlantAndEquipmentMember
1000 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1001 Useful lives (years) Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
1002 1098 - Disclosure - Significant Accounting Policies - Estimated Useful Lives of the Group's Intangible Assets (Detail) Network

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1003 Disclosure of detailed information about intangible assets [table] Table

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1004 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
1005 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1006 Frequency usage rights [member] Member ifrs-full:BroadcastingRightsMember
1007 Land usage rights [member] Member skm:LandUsageRightsMember
1008 Industrial rights [member] Member skm:IndustrialRightsMember
1009 Development costs [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
1010 Facility usage rights [member] Member ifrs-full:RightofuseAssetsMember
1011 Customer relations [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
1012 Other [member] Member ifrs-full:OtherIntangibleAssetsMember
1013 Software [member] Member ifrs-full:ComputerSoftwareMember
1014 Range [axis] Axis ifrs-full:RangeAxis
1015 Ranges [member] Member ifrs-full:RangesMember
1016 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1017 Top of range [member] Member ifrs-full:TopOfRangeMember
1018 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1019 Useful lives (years) Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
1020 1099 - Disclosure - Significant Accounting Policies - Additional Information (Detail) Network

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1021 Disclosure of reclassification of financial assets [table] Table

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1022 Range [axis] Axis ifrs-full:RangeAxis
1023 Ranges [member] Member ifrs-full:RangesMember
1024 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1025 Top of range [member] Member ifrs-full:TopOfRangeMember
1026 Effect of overlay approach reclassification [axis] Axis ifrs-full:EffectOfOverlayApproachReclassificationAxis
1027 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1028 IFRS 16 [member] Member skm:IFRS16Member
1029 Disclosure of reclassification of financial assets [line items] LineItems ifrs-full:DisclosureOfReclassificationOfFinancialAssetsLineItems
1030 Investment property, estimated useful lives Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesInvestmentPropertyCostModel
1031 Description of recognition exemptions of short-term leases Concept (Text/String) For Period ifrs-full:StatementThatLesseeAccountsForShorttermLeasesUsingRecognitionExemption
1032 Description of recognition exemptions of low value assets leases Concept (Text/String) For Period ifrs-full:StatementThatLesseeAccountsForLeasesOfLowvalueAssetsUsingRecognitionExemption
1033 Short term leases term Concept (xbrli:durationItemType) For Period skm:ShortTermLeasesTerm
1034 Leases, low value assets Concept (Monetary) As Of Credit skm:LowValueLeaseAssetsValue
1035 1100 - Disclosure - Operating Segments - Segment Information (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureOperatingSegmentsSegmentInformation
1036 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
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1038 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1039 Operating segments [member] Member ifrs-full:OperatingSegmentsMember
1040 Adjustments [member] Member ifrs-full:MaterialReconcilingItemsMember
1041 Segments [axis] Axis ifrs-full:SegmentsAxis
1042 Segments [member] Member ifrs-full:SegmentsMember
1043 Cellular services [member] Member skm:CellularServicesMember
1044 Fixed-line telecommunication services [member] Member skm:FixedlineTelecommunicationServicesMember
1045 E-commerce services [member] Member skm:EcommerceServicesMember
1046 Others [member] Member ifrs-full:AllOtherSegmentsMember
1047 Types of customers [axis] Axis ifrs-full:TypesOfCustomersAxis
1048 Types of customers [member] Member ifrs-full:TypesOfCustomersMember
1049 Intersegment [member] Member skm:IntersegmentMember
1050 External [member] Member skm:ExternalMember
1051 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1052 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1053 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1054 Operating profit (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
1055 Gain relating to investments in subsidiaries, associates and joint ventures, net Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1056 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
1057 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
1058 Profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1059 1101 - Disclosure - Operating Segments - Reconciliation of Total Segment Operating Income to Consolidated Operating Profit from Continuing Operations (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureOperatingSegmentsReconciliationOfTotalSegmentOperatingIncomeToConsolidatedOperatingProfitFromContinuingOperations
1060 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1061 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1062 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1063 Operating segments [member] Member ifrs-full:OperatingSegmentsMember
1064 Adjustments [member] Member ifrs-full:MaterialReconcilingItemsMember
1065 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1066 Operating income Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
1067 Gain on disposal of property and equipment and intangible assets Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfNoncurrentAssets
1068 Others Concept (Monetary) For Period Credit ifrs-full:MiscellaneousOtherOperatingIncome
1069 Other operating income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
1070 Impairment loss on property and equipment and intangible assets Concept (Monetary) For Period Debit skm:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentAndIntangibleAssets
1071 Loss on disposal of property and equipment and intangible assets Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
1072 Donations Concept (Monetary) For Period Debit ifrs-full:DonationsAndSubsidiesExpense
1073 Bad debt for accounts receivable - other Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9
1074 Others Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
1075 Other operating expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
1076 1102 - Disclosure - Operating Segments - Reconciliation of Total Segment Operating Income to Consolidated Operating Profit from Continuing Operations (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureOperatingSegmentsReconciliationOfTotalSegmentOperatingIncomeToConsolidatedOperatingProfitFromContinuingOperationsParenthetical
1077 Implied Table Table

*

*

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1078 Disclosure of operating segments [abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
1079 Penalty refund Concept (Monetary) For Period Credit skm:PenaltyRefund
1080 Penalties and various other expenses Concept (Monetary) For Period Debit skm:PenaltiesAndOtherExpenses
1081 1103 - Disclosure - Operating Segments - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureOperatingSegmentsAdditionalInformation
1082 Disclosure of operating segments [table] Table

*

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 ifrs-full:DisclosureOfOperatingSegmentsTable
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1084 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1085 Domestic [member] Member ifrs-full:CountryOfDomicileMember
1086 Outside of Korea [member] Member ifrs-full:ForeignCountriesMember
1087 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1088 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1089 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts
1090 1104 - Disclosure - Operating Segments - Summary of Disaggregation of Operating Revenue (Detail) Network

*

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 http://www.sktelecom.com/taxonomy/role/DisclosureOperatingSegmentsSummaryOfDisaggregationOfOperatingRevenue
1091 Disclosure of disaggregation of revenue from contracts with customers [table] Table

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1092 Products and services [Axis] Axis ifrs-full:ProductsAndServicesAxis
1093 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1094 Goods [member] Member skm:GoodsMember
1095 Products and service [member] Member skm:ProductsAndServiceMember
1096 Wireless service [member] Member skm:WirelessServiceMember
1097 Cellular interconnection [member] Member skm:CellularInterconnectionMember
1098 Other [member] Member skm:OtherMember
1099 Fixed line telephone service [member] Member skm:FixedLineTelephoneServiceMember
1100 Fixed line interconnection [member] Member skm:FixedLineInterconnectionMember
1101 Internet protocol television [member] Member skm:InternetprotocoltelevisionMember
1102 International calls [member] Member skm:InternationalCallsMember
1103 Internet service and miscellaneous [member] Member skm:InternetServiceAndMiscellaneousMember
1104 E-commerce service [member] Member skm:EcommerceServiceMember
1105 Miscellaneous [member] Member skm:MiscellaneousMember
1106 Segments [axis] Axis ifrs-full:SegmentsAxis
1107 Segments [member] Member ifrs-full:SegmentsMember
1108 Cellular services [member] Member skm:CellularServicesMember
1109 Fixed-line telecommunication services [member] Member skm:FixedlineTelecommunicationServicesMember
1110 Others [member] Member ifrs-full:AllOtherSegmentsMember
1111 Fixed-line telecommunication revenue [member] Member skm:FixedlineTelecommunicationRevenueMember
1112 E-commerce services revenue [member] Member skm:EcommerceServicesRevenueMember
1113 Other revenue [member] Member skm:OtherRevenueMember
1114 Timing of transfer of goods or services [axis] Axis ifrs-full:TimingOfTransferOfGoodsOrServicesAxis
1115 Timing of transfer of goods or services [member] Member ifrs-full:TimingOfTransferOfGoodsOrServicesMember
1116 Goods or services transferred at point in time [member] Member ifrs-full:GoodsOrServicesTransferredAtPointInTimeMember
1117 Goods or services transferred over time [member] Member ifrs-full:GoodsOrServicesTransferredOverTimeMember
1118 Disclosure of disaggregation of revenue from contracts with customers [line items] LineItems ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
1119 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1120 1105 - Disclosure - Restricted Deposits - Deposits Which are Restricted in Use (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureRestrictedDepositsDepositsWhichAreRestrictedInUse
1121 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
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1123 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1124 Restricted deposits [member] Member skm:RestrictedDepositsMember
1125 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1126 Short-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
1127 Long-term financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentFinancialAssets
1128 Financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
1129 1106 - Disclosure - Trade and Other Receivables - Details of Trade and Other Receivables (Detail) Network

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 http://www.sktelecom.com/taxonomy/role/DisclosureTradeAndOtherReceivablesDetailsOfTradeAndOtherReceivables
1130 Disclosure of financial assets [table] Table

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 ifrs-full:DisclosureOfFinancialAssetsTable
1131 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1132 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1133 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1134 Loss allowance [member] Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
1135 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1136 Accounts receivable - trade Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1137 Short-term loans Concept (Monetary) As Of Debit skm:ShorttermLoansReceivable
1138 Accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
1139 Accrued income Concept (Monetary) As Of Debit ifrs-full:CurrentAccruedIncome
1140 Guarantee deposits (Other current assets) Concept (Monetary) As Of Debit skm:GuaranteeDepositsCurrent
1141 Trade and other receivables, current Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
1142 Long-term loans Concept (Monetary) As Of Debit skm:LongtermLoansReceivable
1143 Long-term accounts receivable - other Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentReceivables
1144 Guarantee deposits Concept (Monetary) As Of Debit ifrs-full:LongtermDeposits
1145 Long-term accounts receivable - trade (Other non-current assets) Concept (Monetary) As Of Debit ifrs-full:NoncurrentTradeReceivables
1146 Trade and other receivables, noncurrent Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivables
1147 Trade and other receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherReceivables
1148 1107 - Disclosure - Trade and Other Receivables - Details of Trade and Other Receivables (Parenthetical) (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureTradeAndOtherReceivablesDetailsOfTradeAndOtherReceivablesParenthetical
1149 Disclosure of financial assets [table] Table

*

*

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1150 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1151 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1152 Gross and carrying amounts of accounts receivable other [member] Member skm:GrossAndCarryingAmountsOfAccountsReceivableOtherMember
1153 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1154 Financial instruments classified as FVTPL Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
1155 1108 - Disclosure - Trade and Other Receivables - Changes in Loss Allowance on Accounts Receivable - Trade Measured at Amortized Costs (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTradeAndOtherReceivablesChangesInLossAllowanceOnAccountsReceivableTradeMeasuredAtAmortizedCosts
1156 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1157 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1158 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1159 Trade and other receivables [member] Member skm:TradeAndOtherReceivableMember
1160 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1161 Beginning balance Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1162 Impact of adopting IFRS 9 Concept (Monetary) For Period Credit skm:IncreaseDecreaseDueToAdoptionOfIFRS9
1163 Impairment Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossOnFinancialAssets
1164 Write-offs Concept (Monetary) For Period Debit ifrs-full:UtilisationAllowanceAccountForCreditLossesOfFinancialAssets
1165 Collection of receivables previously written-off Concept (Monetary) For Period ifrs-full:ReversalAllowanceAccountForCreditLossesOfFinancialAssets
1166 Business combination and others Concept (Monetary) For Period Credit skm:IncreaseDecreaseThroughBusinessCombinationAndOtherChangesAllowanceAccountForCreditLossesOfFinancialAssets
1167 Ending Balance Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1168 Trade and other receivables write off description Concept (Text/String) For Period skm:DescriptionOfTradeAndOtherReceivablesWritesOff
1169 1109 - Disclosure - Trade and Other Receivables - Summary of Loss Allowance on Accounts Receivable - Trade (Detail) Network

*

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 http://www.sktelecom.com/taxonomy/role/DisclosureTradeAndOtherReceivablesSummaryOfLossAllowanceOnAccountsReceivableTrade
1170 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1171 Maturity [axis] Axis ifrs-full:MaturityAxis
1172 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1173 Not Later Than Six Months [member] Member skm:NotLaterThanSixMonthsMember
1174 More Than 6 Months [Member] Member ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
1175 1 - 3 years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1176 More than 3 years [Member] Member ifrs-full:LaterThanThreeYearsMember
1177 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1178 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1179 Trade and other receivables [member] Member skm:TradeAndOtherReceivableMember
1180 Segments [axis] Axis ifrs-full:SegmentsAxis
1181 Segments [member] Member ifrs-full:SegmentsMember
1182 Telecommunications service revenue [member] Member skm:TelecommunicationsServiceRevenueMember
1183 Other revenue [member] Member skm:OtherRevenueMember
1184 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1185 Expected credit loss rate Concept (Percent) As Of ifrs-full:ExpectedCreditLossRate
1186 Gross amount Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
1187 Loss allowance Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1188 1110 - Disclosure - Prepaid Expenses - Summary of Prepaid Expenses (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosurePrepaidExpensesSummaryOfPrepaidExpenses
1189 Implied Table Table

*

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1190 Disclosure of prepaid expenses [abstract] Abstract skm:DisclosureOfPrepaidExpensesAbstract
1191 Incremental costs of obtaining contracts Concept (Monetary) As Of Debit skm:AssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersCurrent
1192 Others Concept (Monetary) As Of Debit skm:CurrentPrepaidExpensesOthers
1193 Current prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
1194 Incremental costs of obtaining contracts Concept (Monetary) As Of Debit skm:AssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersNoncurrent
1195 Others Concept (Monetary) As Of Debit skm:NoncurrentPrepaidExpensesOthers
1196 Noncurrent prepayments Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
1197 1111 - Disclosure - Prepaid Expenses - Summary of Incremental Costs of Obtaining Contracts That Capitalized as Assets and Related Amortization Recognized as Commissions (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosurePrepaidExpensesSummaryOfIncrementalCostsOfObtainingContractsThatCapitalizedAsAssetsAndRelatedAmortizationRecognizedAsCommissions
1198 Implied Table Table

*

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1199 Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract] Abstract ifrs-full:DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAbstract
1200 Amortization recognized as commissions Concept (Monetary) For Period Debit ifrs-full:AmortisationAssetsRecognisedFromCostsIncurredToObtainOrFulfilContractsWithCustomers
1201 1112 - Disclosure - Contract Assets and Liabilities - Summary of Contract Assets and Liabilities (Detail) Network

*

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 http://www.sktelecom.com/taxonomy/role/DisclosureContractAssetsAndLiabilitiesSummaryOfContractAssetsAndLiabilities
1202 Disclosure of revenue from contracts with customers [table] Table

*

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 skm:DisclosureOfRevenueFromContractsWithCustomersTable
1203 Products and services [Axis] Axis ifrs-full:ProductsAndServicesAxis
1204 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1205 Allocation of consideration between performance obligations [member] Member skm:AllocationOfConsiderationBetweenPerformanceObligationsMember
1206 Wireless service contracts [member] Member skm:WirelessServiceContractsMember
1207 Customer loyalty programs [member] Member skm:CustomerLoyaltyProgramsMember
1208 Fixed-line service contracts [member] Member skm:FixedlineServiceContractsMember
1209 E Commerce Services [member] Member skm:CommerceServicesMember
1210 Security services [member] Member skm:SecurityServicesMember
1211 Other contract liabilities [member] Member skm:OtherContractLiabilitiesMember
1212 Disclosure of revenue from contracts with customers [line items] LineItems skm:DisclosureOfRevenueFromContractsWithCustomersLineItems
1213 Contract assets Concept (Monetary) As Of Debit ifrs-full:ContractAssets
1214 Contract liabilities Concept (Monetary) As Of Credit ifrs-full:ContractLiabilities
1215 1113 - Disclosure - Contract Assets and Liabilities - Additional Information (Detail) Network

*

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 http://www.sktelecom.com/taxonomy/role/DisclosureContractAssetsAndLiabilitiesAdditionalInformation
1216 Implied Table Table

*

*

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1217 Revenue [abstract] Abstract ifrs-full:RevenueAbstract
1218 Revenue from performance obligations satisfied or partially satisfied in prior periods Concept (Monetary) For Period Credit ifrs-full:RevenueFromPerformanceObligationsSatisfiedOrPartiallySatisfiedInPreviousPeriods
1219 1114 - Disclosure - Inventories - Details of Inventories (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureInventoriesDetailsOfInventories
1220 Disclosure of inventories [Table] Table

*

*

 skm:DisclosureOfInventoriesTable
1221 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1222 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1223 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1224 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1225 Disclosure of inventories [Line Items] LineItems skm:DisclosureOfInventoriesLineItems
1226 Merchandise Concept (Monetary) As Of Debit ifrs-full:Merchandise
1227 Finished goods Concept (Monetary) As Of Debit ifrs-full:FinishedGoods
1228 Work in process Concept (Monetary) As Of Debit ifrs-full:WorkInProgress
1229 Raw materials Concept (Monetary) As Of Debit ifrs-full:RawMaterials
1230 Supplies Concept (Monetary) As Of Debit ifrs-full:ProductionSupplies
1231 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
1232 1115 - Disclosure - Inventories - Amount of the Inventory Write-downs Charged to the Consolidated Statement of Income and Write-off of Inventories (Detail) Network

*

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 http://www.sktelecom.com/taxonomy/role/DisclosureInventoriesAmountOfTheInventoryWritedownsChargedToTheConsolidatedStatementOfIncomeAndWriteoffOfInventories
1233 Implied Table Table

*

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1234 Classes of current inventories [abstract] Abstract ifrs-full:ClassesOfInventoriesAbstract
1235 Charged to cost of products that have been resold Concept (Monetary) For Period Debit ifrs-full:CostOfInventoriesRecognisedAsExpenseDuringPeriod
1236 Write-off upon sale Concept (Monetary) For Period ifrs-full:InventoryWritedown2011
1237 1116 - Disclosure - Inventories - Additional Information (Detail) Network

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 http://www.sktelecom.com/taxonomy/role/DisclosureInventoriesAdditionalInformation
1238 Disclosure of inventories [Table] Table

*

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1239 Income Statement Location 1 [axis] Axis skm:IncomeStatementLocation1Axis
1240 Income Statement Location 1 [member] Member skm:IncomeStatementLocationMember
1241 Cost of goods sold [member] Member skm:CostOfGoodsSoldMember
1242 Inventories [line items] LineItems skm:InventoriesLineItems
1243 Reversals of inventory write-downs Concept (Monetary) For Period ifrs-full:ReversalOfInventoryWritedown
1244 Inventories recognized as operating expenses Concept (Monetary) For Period Debit ifrs-full:CostOfInventoriesRecognisedAsExpenseDuringPeriod
1245 1117 - Disclosure - Investment Securities - Details of Short-term Investment Securities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentSecuritiesDetailsOfShorttermInvestmentSecurities
1246 Disclosure of financial assets [table] Table

*

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1247 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1248 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1249 Beneficiary certificates [member] Member skm:BeneficiaryCertificatesMember
1250 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1251 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
1252 FVTPL Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
1253 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
1254 1118 - Disclosure - Investment Securities - Details of Long-term Investment Securities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentSecuritiesDetailsOfLongtermInvestmentSecurities
1255 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1256 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1257 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1258 Equity securities [member] Member skm:EquitySecurities1Member
1259 Investment bonds [member] Member ifrs-full:DebtSecuritiesMember
1260 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1261 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
1262 FVOCI Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1263 Non current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
1264 FVTPL Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss
1265 1119 - Disclosure - Investment Securities - Details of Long-term Investment Securities (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentSecuritiesDetailsOfLongtermInvestmentSecuritiesParenthetical
1266 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1267 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1268 Hedging Instruments [Member] Member ifrs-full:HedgingInstrumentsMember
1269 Redeemable convertible preferred shares issued by Bluehole INC [member] Member skm:RedeemableConvertiblePreferredSharesIssuedByBlueholeIncMember
1270 Investment [Axis] Axis invest:InvestmentAxis
1271 Investment [Domain] Member invest:InvestmentDomain
1272 KB Financial Group Inc [member] Member skm:KBFinancialGroupIncMember
1273 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1274 Investments in equity instruments that are not held for trading as financial assets at FVOCI Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
1275 Sale of shares, number of shares sold Concept (Shares) For Period skm:NumberOfSharesOfMarketableEquitySecuritiesSold
1276 Sale of shares, amount of cash Concept (Monetary) For Period Debit skm:ProceedsFromDisposalsOfLongtermInvestmentSecurities
1277 Sale of shares, number of shares exchanged Concept (Shares) For Period skm:NumberOfSharesOfMarketableEquitySecuritiesExchanged
1278 Sale of shares, gain on disposal of long-term investment securities Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
1279 Number of shares acquired for exercising the conversion rights Concept (Shares) For Period ifrs-full:DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares
1280 Financial asset at FVOCI Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1281 1120 - Disclosure - Business Combination - Additional information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBusinessCombinationAdditionalInformation
1282 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
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1284 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1285 SM LIFE DESIGN COMPANY JAPAN INC [member] Member skm:SMLIFEDESIGNCOMPANYJAPANINCMember
1286 S.M. Mobile Communications JAPAN Inc [member] Member skm:SMMobileCommunicationsJapanIncMember
1287 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
1288 Id Quantique SA [member] Member skm:IdQuantiqueSAMember
1289 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
1290 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
1291 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1292 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1293 SK Telink Co., Ltd. [member] Member skm:SKTelinkCoLtdMember
1294 Iriver Limted [member] Member skm:IRIVERLIMITEDMember
1295 Ownership [Axis] Axis srt:OwnershipAxis
1296 Ownership [Domain] Member srt:OwnershipDomain
1297 ADT CAPS Co., Ltd. [member] Member skm:ADTCAPSCoLtdMember
1298 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
1299 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
1300 Acquisition of shares Concept (Shares) For Period skm:BusinessAcquisitionNumberOfSharesAcquired
1301 Sale of shares, amount of cash Concept (Monetary) For Period Debit skm:ProceedsFromDisposalsOfLongtermInvestmentSecurities
1302 Number of shares Concept (Shares) As Of skm:NumberOfSharesAcquired
1303 Ownership percentage Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
1304 Additional shares acquired in exchange for assets Concept (Shares) For Period skm:AdditionalSharesAcquiredInExchangeForAssets
1305 Business acquisition exchange of asset value Concept (Monetary) For Period Credit skm:BusinessAcquisitionExchangeOfAssetValue
1306 Increase in percentage of ownership Concept (Percent) For Period skm:PercentageOfIncreaseInOwnershipInterests
1307 Revenue of acquiree since acquisition date Concept (Monetary) For Period Credit ifrs-full:RevenueOfAcquiree
1308 Profit (loss) of acquiree since acquisition date Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfAcquiree
1309 Consideration transferred in cash Concept (Monetary) As Of Credit ifrs-full:CashTransferred
1310 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1311 Capital surplus and other recognized as of acquisition date Concept (Monetary) As Of Credit skm:CapitalSurplusAndOthersRecognizedAsOfAcquisitionDate
1312 1121 - Disclosure - Business Combinations - Summary of Acquiree (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBusinessCombinationsSummaryOfAcquiree
1313 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
1314 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1315 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1316 Id Quantique SA [member] Member skm:IdQuantiqueSAMember
1317 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
1318 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
1319 Corporate name Concept (Text/String) For Period ifrs-full:NameOfAcquiree
1320 Location Concept (Text/String) For Period skm:AcquireeLocation
1321 CEO Concept (Text/String) For Period skm:CEOOfAcquiree
1322 Industry Concept (Text/String) For Period skm:IndustryOfAcquiree
1323 1122 - Disclosure - Business Combinations - Considerations Transferred Identifiable Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBusinessCombinationsConsiderationsTransferredIdentifiableAssetsAcquiredAndLiabilitiesAssumedAtAcquisitionDate
1324 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
1325 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1326 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1327 Id Quantique SA [member] Member skm:IdQuantiqueSAMember
1328 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
1329 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
1330 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
1331 Considerations paid: Abstract ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
1332 Treasury shares of the Parent Company Concept (Monetary) As Of Debit skm:TreasurySharesAsOfAcquisitionDate
1333 Cash and cash equivalents Concept (Monetary) As Of Credit ifrs-full:CashTransferred
1334 Existing shares (financial assets at FVOCI) at fair value Concept (Monetary) As Of Debit skm:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeRecognisedAsOfAcquisitionDate
1335 Considerations transferred Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
1336 Assets and liabilities acquired: Abstract ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
1337 Cash and cash equivalent Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
1338 Trade and other receivables Concept (Monetary) As Of Debit skm:TradeAndOtherReceivablesRecognisedAsOfAcquisitionDate
1339 Inventories Concept (Monetary) As Of Debit ifrs-full:InventoryRecognisedAsOfAcquisitionDate
1340 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
1341 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
1342 Other assets Concept (Monetary) As Of Debit skm:OtherAssetsRecognisedAsOfAcquisitionDate
1343 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
1344 Borrowings Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
1345 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
1346 Other liabilities Concept (Monetary) As Of Credit skm:OtherLiabilitiesRecognisedAsOfAcquisitionDate
1347 Assets and liabilities acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
1348 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
1349 Deduction of capital surplus and others (I - II) Concept (Monetary) As Of Credit skm:CapitalSurplusAndOthersRecognizedAsOfAcquisitionDate
1350 Goodwill(I - II+III) Concept (Monetary) As Of Debit ifrs-full:GoodwillRecognisedAsOfAcquisitionDate
1351 1123 - Disclosure - Business Combination - Additional information (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBusinessCombinationAdditionalInformationParenthetical
1352 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
1353 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1354 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1355 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
1356 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
1357 Number of treasury shares transferred as consideration Concept (Shares) As Of skm:NumberOfSharesInTreasurySharesTransferredAsConsideration
1358 Fair value of total consideration transferred Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
1359 1124 - Disclosure - Business Combination - Considerations Transferred Identifiable Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBusinessCombinationConsiderationsTransferredIdentifiableAssetsAcquiredAndLiabilitiesAssumedAtAcquisitionDate
1360 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
1361 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1362 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1363 SM LIFE DESIGN COMPANY JAPAN INC [member] Member skm:SMLIFEDESIGNCOMPANYJAPANINCMember
1364 S.M. Mobile Communications JAPAN Inc [member] Member skm:SMMobileCommunicationsJapanIncMember
1365 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
1366 Considerations paid: Abstract ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
1367 Cash and cash equivalents Concept (Monetary) As Of Credit ifrs-full:CashTransferred
1368 Shares of IRIVER LIMITED Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
1369 Assets and liabilities acquired: Abstract ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
1370 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
1371 Trade and other receivables Concept (Monetary) As Of Debit skm:TradeAndOtherReceivablesRecognisedAsOfAcquisitionDate
1372 Inventories Concept (Monetary) As Of Debit ifrs-full:InventoryRecognisedAsOfAcquisitionDate
1373 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
1374 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
1375 Other assets Concept (Monetary) As Of Debit skm:OtherAssetsRecognisedAsOfAcquisitionDate
1376 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
1377 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
1378 Other liabilities Concept (Monetary) As Of Credit skm:OtherLiabilitiesRecognisedAsOfAcquisitionDate
1379 Net assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
1380 1125 - Disclosure - Investments in Associates and Joint Ventures - Investments in Associates and Joint Ventures Accounted for using the Equity Method (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesInvestmentsInAssociatesAndJointVenturesAccountedForUsingTheEquityMethod
1381 Disclosure of investments in associates and joint ventures [Table] Table

*

*

 skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1382 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1383 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1384 SK China Company Ltd. [member] Member skm:SKChinaCompanyLtdMember
1385 Korea IT fund [member] Member skm:KoreaITFundMember
1386 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
1387 NanoEnTek, Inc. [member] Member skm:NanoEnTekIncMember
1388 SK Technology Innovation Company [member] Member skm:SKTechnologyInnovationCompanyMember
1389 HappyNarae Co., Ltd. [member] Member skm:HappyNaraeCoLtdMember
1390 SK hynix Inc. [member] Member skm:SKhynixIncMember
1391 SK MENA Investment B.V. [member] Member skm:SKMENAInvestmentBVMember
1392 S.M. Culture & Contents Co., Ltd [member] Member skm:SMCultureAndContentsCoLtdMember
1393 Xian Tianlong Science and Technology Co., Ltd. [member] Member skm:XianTianlongScienceAndTechnologyCoLtdMember
1394 Hello Nature Ltd. [member] Member skm:HelloNatureLtdMember
1395 Twelve CM Japan Inc [member] Member skm:TwelveCMJapanIncMember
1396 Makeus Corp.[member] Member skm:MAKESUPCorpMember
1397 SK South East Asia Investment Pte. Ltd. [member] Member skm:SKSouthEastAsiaInvestmentMember
1398 Pacific Telecom Inc [member] Member skm:PacificTelecomIncMember
1399 Health Connect Co., Ltd. and others [member] Member skm:HealthConnectCoLtdAndOthersMember
1400 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1401 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1402 Dogus Planet, Inc. [member] Member skm:DogusPlanetIncMember
1403 Finnq Co. Ltd. [member] Member skm:FinnqCoLtdMember
1404 12CM GLOBAL PTE. LTD. [member] Member skm:TWELVECMGLOBALPTELTDMember
1405 Celcom planet [member] Member skm:CelcomPlanetMember
1406 Disclosure of investments in associates and joint ventures [Line Items] LineItems skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1407 Associates, Country Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOrResidenceOfAssociate
1408 Associates, Ownership (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1409 Associates, Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
1410 Joint ventures, Country Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOfJointVenture
1411 Joint ventures, Ownership (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
1412 Joint ventures, Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
1413 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1414 1126 - Disclosure - Investments in Associates and Joint Ventures - Investments in Associates and Joint Ventures Accounted for using the Equity Method (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesInvestmentsInAssociatesAndJointVenturesAccountedForUsingTheEquityMethodParenthetical
1415 Disclosure of investments in associates and joint ventures [Table] Table

*

*

 skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1416 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1417 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1418 Celcom planet [member] Member skm:CelcomPlanetMember
1419 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1420 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1421 Hello Nature Ltd. [member] Member skm:HelloNatureLtdMember
1422 Disclosure of investments in associates and joint ventures [Line Items] LineItems skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1423 Percentage of decrease in equity interests Concept (Percent) For Period skm:DecreaseInEquityInterestsPercentage
1424 Percentage of change in company ownership Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1425 Obligation for additional investments Concept (Monetary) For Period Credit skm:ObligationForAdditionalInvestments
1426 Acquisition and disposition Concept (Monetary) For Period Debit skm:AcquisitionAndDispositionOfInvestmentsInJointVenturesAndAssociates
1427 1127 - Disclosure - Investments in Associates and Joint Ventures - Market Price of Investments in Listed Associates (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesMarketPriceOfInvestmentsInListedAssociates
1428 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1429 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1430 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1431 NanoEnTek, Inc. [member] Member skm:NanoEnTekIncMember
1432 SK hynix Inc. [member] Member skm:SKhynixIncMember
1433 S.M. Culture & Contents Co., Ltd [member] Member skm:SMCultureAndContentsCoLtdMember
1434 Disclosure of associates [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1435 Market price per share Concept (Share) As Of skm:MarketValuePerShare
1436 Number of shares Concept (Shares) For Period skm:NumberOfSharesHeldInAssociates
1437 Market value Concept (Monetary) As Of Debit skm:MarketValueOfInvestment
1438 1128 - Disclosure - Investments in Associates and Joint Ventures - Financial Information of Significant Associates (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesFinancialInformationOfSignificantAssociates
1439 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1440 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1441 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1442 SK hynix Inc. [member] Member skm:SKhynixIncMember
1443 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
1444 Korea IT fund [member] Member skm:KoreaITFundMember
1445 SK China Company Ltd. [member] Member skm:SKChinaCompanyLtdMember
1446 Disclosure of associates [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1447 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1448 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1449 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1450 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1451 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
1452 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1453 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
1454 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
1455 1129 - Disclosure - Investments in Associates and Joint Ventures - Condensed Financial Information of Joint Ventures (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesCondensedFinancialInformationOfJointVentures
1456 Disclosure of joint ventures [table] Table

*

*

 ifrs-full:DisclosureOfJointVenturesTable
1457 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1458 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1459 Dogus Planet, Inc. [member] Member skm:DogusPlanetIncMember
1460 Finnq Co. Ltd. [member] Member skm:FinnqCoLtdMember
1461 PT XL planet digital [member] Member skm:PTXLPlanetDigitalMember
1462 Disclosure of joint ventures [line items] LineItems ifrs-full:DisclosureOfJointVenturesLineItems
1463 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1464 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1465 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1466 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1467 Accounts payable, other payables and provision Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayables
1468 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1469 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueAndOperatingIncome
1470 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1471 Interest income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
1472 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
1473 Income tax benefit Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1474 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1475 Total comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
1476 1130 - Disclosure - Investments in Associates and Joint Ventures - Reconciliations of Financial Information of Significant Associates to Carrying Amounts of Investments in Associates in the Consolidated Financial Statements (Detail) Network

*

*

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1477 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1478 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1479 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1480 SK hynix Inc. [member] Member skm:SKhynixIncMember
1481 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
1482 Korea IT fund [member] Member skm:KoreaITFundMember
1483 SK China Company Ltd. [member] Member skm:SKChinaCompanyLtdMember
1484 Disclosure of associates [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1485 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
1486 Ownership interests (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1487 Net assets attributable to ownership interests Concept (Monetary) As Of Debit skm:NetAssetsLiabilitiesAttributableToOwnershipInterest
1488 Cost-book value differentials Concept (Monetary) As Of Debit skm:CostBookValueDifferentials
1489 Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
1490 1131 - Disclosure - Investments in Associates and Joint Ventures - Reconciliations of Financial Information of Significant Associates to Carrying Amounts of Investments in Associates in the Consolidated Financial Statements (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesReconciliationsOfFinancialInformationOfSignificantAssociatesToCarryingAmountsOfInvestmentsInAssociatesInTheConsolidatedFinancialState_XaParenthetical
1491 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1492 Range [axis] Axis ifrs-full:RangeAxis
1493 Ranges [member] Member ifrs-full:RangesMember
1494 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1495 Top of range [member] Member ifrs-full:TopOfRangeMember
1496 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1497 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1498 SK hynix Inc. [member] Member skm:SKhynixIncMember
1499 Disclosure of associates [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1500 Equity method effective ownership interest Concept (Percent) For Period skm:EquityMethodInvestmentEffectiveOwnershipPercentageInAssociates
1501 1132 - Disclosure - Investments in Associates and Joint Ventures - Details of the Changes in Investments in Associates and Joint Ventures Accounted for using the Equity Method (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesDetailsOfTheChangesInInvestmentsInAssociatesAndJointVenturesAccountedForUsingTheEquityMethod
1502 Disclosure of investments in associates and joint ventures [Table] Table

*

*

 skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1503 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1504 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1505 Dogus Planet, Inc. [member] Member skm:DogusPlanetIncMember
1506 Celcom planet [member] Member skm:CelcomPlanetMember
1507 PT XL planet digital [member] Member skm:PTXLPlanetDigitalMember
1508 Finnq Co. Ltd. [member] Member skm:FinnqCoLtdMember
1509 12CM GLOBAL PTE. LTD. [member] Member skm:TWELVECMGLOBALPTELTDMember
1510 Joint ventures [member] Member ifrs-full:JointVenturesMember
1511 Celcom Planet and others [member] Member skm:CelcomPlanetAndOthersMember
1512 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1513 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1514 SK China Company Ltd. [member] Member skm:SKChinaCompanyLtdMember
1515 Korea IT fund [member] Member skm:KoreaITFundMember
1516 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
1517 NanoEnTek, Inc. [member] Member skm:NanoEnTekIncMember
1518 SK Industrial Development China Co., Ltd. [member] Member skm:SKIndustrialDevelopmentChinaCoLtdMember
1519 SK Technology Innovation Company [member] Member skm:SKTechnologyInnovationCompanyMember
1520 HappyNarae Co., Ltd. [member] Member skm:HappyNaraeCoLtdMember
1521 SK hynix Inc. [member] Member skm:SKhynixIncMember
1522 SK MENA Investment B.V. [member] Member skm:SKMENAInvestmentBVMember
1523 SKY Property Mgmt. Ltd. [member] Member skm:SKYPropertyMgmtLtdMember
1524 Associates [member] Member ifrs-full:AssociatesMember
1525 S.M. Culture & Contents Co., Ltd [member] Member skm:SMCultureAndContentsCoLtdMember
1526 Xian Tianlong Science and Technology Co., Ltd. [member] Member skm:XianTianlongScienceAndTechnologyCoLtdMember
1527 Makeus Corp.[member] Member skm:MAKESUPCorpMember
1528 SK South East Asia Investment Pte Ltd [member] Member skm:SKSouthEastAsiaInvestmentPteLtdMember
1529 Pacific Telecom Inc [member] Member skm:PacificTelecomIncMember
1530 Health Connect Co., Ltd. and others [member] Member skm:HealthConnectCoLtdAndOthersMember
1531 Hello Nature Ltd. [member] Member skm:HelloNatureLtdMember
1532 Twelve CM Japan Inc [member] Member skm:TwelveCMJapanIncMember
1533 Disclosure of investments in associates and joint ventures [Line Items] LineItems skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1534 Beginning balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1535 Acquisition and disposition Concept (Monetary) For Period Debit skm:AcquisitionAndDispositionOfInvestmentsInJointVenturesAndAssociates
1536 Share of profit (loss) Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfContinuingOperationsOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1537 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1538 Impairment loss Concept (Monetary) For Period Debit skm:ImpairmentLossOfInvestmentsInJointVenturesAndAssociates
1539 Other increase (decrease) Concept (Monetary) For Period Debit skm:OtherIncreaseDecreaseOfInvestmentsInJointVenturesAndAssociates
1540 Ending balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1541 1133 - Disclosure - Investments in Associates and Joint Ventures - Details of the Changes in Investments in Associates and Joint Ventures Accounted for using the Equity Method (Parenthetical) (Detail) Network

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 http://www.sktelecom.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesDetailsOfTheChangesInInvestmentsInAssociatesAndJointVenturesAccountedForUsingTheEquityMethodParenthetical
1542 Disclosure of investments in associates and joint ventures [Table] Table

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*

 skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1543 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1544 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1545 PT XL planet digital [member] Member skm:PTXLPlanetDigitalMember
1546 Disclosure of investments in associates and joint ventures [Line Items] LineItems skm:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1547 Loss on disposal shares Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfInvestments
1548 1134 - Disclosure - Investments in Associates and Joint Ventures - Details of Cumulative Unrecognized Equity Method Losses (Detail) Network

*

*

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1549 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1550 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1551 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1552 Wave City Development Co., Ltd. [member] Member skm:WaveCityDevelopmentCoLtdMember
1553 Daehan Kanggun BcN Co., Ltd. and others [member] Member skm:DaehanKanggunBcNCoLtdAndOthersMember
1554 Disclosure of associates [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1555 Unrecognized loss (profit) Concept (Monetary) For Period Debit ifrs-full:UnrecognisedShareOfLossesOfAssociates
1556 Unrecognized loss (profit), cumulative loss Concept (Monetary) As Of Credit ifrs-full:CumulativeUnrecognisedShareOfLossesOfAssociates
1557 Unrecognized change in equity Concept (Monetary) For Period Credit skm:UnrecognizedChangeInEquityOfAssociates
1558 Unrecognized change in equity, cumulative loss Concept (Monetary) As Of Credit skm:CumulativeUnrecognizedChangeInEquityOfAssociates
1559 1135 - Disclosure - Property and Equipment - Summary of Property and Equipment (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosurePropertyAndEquipmentSummaryOfPropertyAndEquipment
1560 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1561 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1562 Property and equipment (depreciation) [Member] Member ifrs-full:PropertyPlantAndEquipmentMember
1563 Land [member] Member ifrs-full:LandMember
1564 Buildings and structures [member] Member ifrs-full:BuildingsMember
1565 Structures [member] Member skm:StructuresMember
1566 Machinery [member] Member ifrs-full:MachineryMember
1567 Other property and equipment [member] Member ifrs-full:OtherPropertyPlantAndEquipmentMember
1568 Construction in progress [member] Member ifrs-full:ConstructionInProgressMember
1569 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1570 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1571 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1572 Accumulated depreciation and amortization [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
1573 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1574 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1575 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1576 1136 - Disclosure - Property and Equipment - Changes in Property and Equipment (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosurePropertyAndEquipmentChangesInPropertyAndEquipment
1577 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1578 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1579 Property and equipment (depreciation) [Member] Member ifrs-full:PropertyPlantAndEquipmentMember
1580 Land [member] Member ifrs-full:LandMember
1581 Buildings and structures [member] Member ifrs-full:BuildingsMember
1582 Structures [member] Member skm:StructuresMember
1583 Machinery [member] Member ifrs-full:MachineryMember
1584 Other property and equipment [member] Member ifrs-full:OtherPropertyPlantAndEquipmentMember
1585 Construction in progress [member] Member ifrs-full:ConstructionInProgressMember
1586 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1587 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1588 Acquisition Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
1589 Disposal Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
1590 Transfer Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
1591 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
1592 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1593 Business Combination Concept (Monetary) For Period Debit skm:BusinessCombinationsPropertyPlantAndEquipment
1594 Disposal of subsidiaries Concept (Monetary) For Period Debit skm:DisposalOfSubsidiariesPropertyPlantAndEquipment
1595 Other Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment
1596 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1597 1137 - Disclosure - Goodwill - Summary of Goodwill (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureGoodwillSummaryOfGoodwill
1598 Disclosure of reconciliation of changes in goodwill [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillTable
1599 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1600 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1601 Shinsegi Telecom, Inc. [member] Member skm:ShinsegiTelecomIncMember
1602 SK Broadband Co., Ltd. [member] Member skm:SKBroadbandCoLtdMember
1603 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
1604 Other acquisitions [member] Member ifrs-full:AggregatedIndividuallyImmaterialBusinessCombinationsMember
1605 Disclosure of reconciliation of changes in goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillLineItems
1606 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1607 1138 - Disclosure - Goodwill - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureGoodwillAdditionalInformation
1608 Disclosure of reconciliation of changes in goodwill [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillTable
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1610 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1611 Shinsegi Telecom, Inc. [member] Member skm:ShinsegiTelecomIncMember
1612 SK Broadband Co., Ltd. [member] Member skm:SKBroadbandCoLtdMember
1613 Iriver Limted [member] Member skm:IRIVERLIMITEDMember
1614 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1615 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1616 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1617 Disclosure of reconciliation of changes in goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillLineItems
1618 Annual discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1619 Annual growth rate Concept (Percent) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
1620 Impairment loss Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
1621 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1622 1139 - Disclosure - Goodwill - Details of the Changes in Goodwill (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureGoodwillDetailsOfTheChangesInGoodwill
1623 Implied Table Table

*

*

 implied:Table
1624 Disclosure of reconciliation of changes in goodwill [abstract] Abstract ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillAbstract
1625 Beginning balance Concept (Monetary) As Of Debit ifrs-full:Goodwill
1626 Acquisition Concept (Monetary) For Period Debit ifrs-full:AdditionalRecognitionGoodwill
1627 Disposal Concept (Monetary) For Period Credit skm:DisposalsGoodwill
1628 Impairment loss Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
1629 Other Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesGoodwill
1630 Ending balance Concept (Monetary) As Of Debit ifrs-full:Goodwill
1631 1140 - Disclosure - Goodwill - Details of the Changes in Goodwill (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureGoodwillDetailsOfTheChangesInGoodwillParenthetical
1632 Implied Table Table

*

*

 implied:Table
1633 Disclosure of reconciliation of changes in goodwill [abstract] Abstract ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillAbstract
1634 Impairment losses for goodwill Concept (Monetary) For Period Debit skm:ImpairmentLossGoodwill
1635 Impairment losses for intangible assets Concept (Monetary) For Period Debit skm:ImpairmentLossOnIntangibleAssetsOtherThanGoodwill
1636 1141 - Disclosure - Intangible Assets - Summary of Intangible Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsSummaryOfIntangibleAssets
1637 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
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1639 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1640 Frequency usage rights [member] Member ifrs-full:BroadcastingRightsMember
1641 Land usage rights [member] Member skm:LandUsageRightsMember
1642 Industrial rights [member] Member skm:IndustrialRightsMember
1643 Development costs [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
1644 Facility usage rights [member] Member ifrs-full:RightofuseAssetsMember
1645 Customer relations [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
1646 Club memberships [Member] Member skm:ClubMembershipsMember
1647 Brand [member] Member skm:BrandMember
1648 Other [member] Member ifrs-full:OtherIntangibleAssetsMember
1649 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1650 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1651 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1652 Accumulated depreciation and amortization [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
1653 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1654 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1655 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1656 1142 - Disclosure - Intangible Assets - Details of the Changes in Intangible Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsDetailsOfTheChangesInIntangibleAssets
1657 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1658 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
1659 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1660 Frequency usage rights [member] Member ifrs-full:BroadcastingRightsMember
1661 Land usage rights [member] Member skm:LandUsageRightsMember
1662 Industrial rights [member] Member skm:IndustrialRightsMember
1663 Development costs [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
1664 Facility usage rights [member] Member ifrs-full:RightofuseAssetsMember
1665 Customer relations [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
1666 Club memberships [Member] Member skm:ClubMembershipsMember
1667 Brand [member] Member skm:BrandMember
1668 Other [member] Member ifrs-full:OtherIntangibleAssetsMember
1669 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1670 Beginning balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1671 Acquisition Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1672 Disposal Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
1673 Transfer Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill
1674 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
1675 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill
1676 Business combination Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1677 Other Concept (Monetary) For Period Debit skm:OtherMovementsInAcquiredIntangiblesOtherThanGoodwill
1678 Ending balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1679 1143 - Disclosure - Intangible Assets - Details of the Changes in Intangible Assets (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsDetailsOfTheChangesInIntangibleAssetsParenthetical
1680 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1681 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1682 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1683 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
1684 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1685 Impairment loss Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill
1686 Indefinite lived intangible assets Concept (Monetary) For Period Debit skm:IndefiniteLivedIntangibleAsset
1687 1144 - Disclosure - Intangible Assets - Research and Development Expenditures Recognized as Expense (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsResearchAndDevelopmentExpendituresRecognizedAsExpense
1688 Implied Table Table

*

*

 implied:Table
1689 Disclosure of detailed information about intangible assets [abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
1690 Research and development costs expensed as incurred Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
1691 1145 - Disclosure - Intangible Assets - Carrying Amount and Residual Useful Lives of Frequency Usage Rights (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsCarryingAmountAndResidualUsefulLivesOfFrequencyUsageRights
1692 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1693 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
1694 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1695 800MHz license [Member] Member skm:FrequencyUsageRightsFor800MHzBandMember
1696 1.8GHz license [Member] Member skm:FrequencyUsageRightsFor1Point8GHzBandMember
1697 2.6GHz license [Member] Member skm:FrequencyUsageRightsFor2Point6GHzBandMember
1698 2.1GHz license [Member] Member skm:FrequencyUsageRightsFor2Point1GHzBandMember
1699 Frequency usage rights for 3 point 5GHz band [member] Member skm:FrequencyUsageRightsFor3Point5GHzBandMember
1700 Frequency usage rights for28 MHz band [member] Member skm:FrequencyUsageRightsFor28MHzBandMember
1701 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1702 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1703 Frequency usage rights [member] Member ifrs-full:BroadcastingRightsMember
1704 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1705 Amount Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1706 Description Concept (Text/String) For Period ifrs-full:DescriptionAndCarryingAmountOfIntangibleAssetsMaterialToEntity
1707 Commencement of amortization Concept (Year/Month) For Period skm:IntangibleAssetsAmortizationStartDate
1708 Completion of amortization Concept (Year/Month) For Period skm:IntangibleAssetsAmortizationEndDate
1709 1146 - Disclosure - Intangible Assets - Carrying Amount and Residual Useful Lives of Frequency Usage Rights (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIntangibleAssetsCarryingAmountAndResidualUsefulLivesOfFrequencyUsageRightsParenthetical
1710 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1711 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
1712 Intangible assets other than goodwill [Member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1713 Frequency usage rights for 3 point 5GHz band [member] Member skm:FrequencyUsageRightsFor3Point5GHzBandMember
1714 Frequency usage rights for28 MHz band [member] Member skm:FrequencyUsageRightsFor28MHzBandMember
1715 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1716 Considerations payable for the bands of frequency Concept (Monetary) For Period Credit skm:ConsiderationPayable
1717 1147 - Disclosure - Borrowings and Debentures - Short-term Borrowings (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBorrowingsAndDebenturesShorttermBorrowings
1718 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
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1720 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1721 3.19% short term borrowings from Shinhan Bank [member] Member skm:ThreePointOneNinePercentageShorttermBorrowingsFromShinhanBankMember
1722 3.75% short term borrowings from Shinhan Bank [member] Member skm:TwoPointTwoSevenPercentageShorttermBorrowingsFromShinhanBankMember
1723 3.75% short term borrowings from Shinhan Bank [member] Member skm:ThreePointSevenFivePercentageShorttermBorrowingsFromShinhanBankMember
1724 3.95% short term borrowings from Shinhan Bank [member] Member skm:ShortTermBorrowingsFromKebHanaBankMember
1725 Commercial Paper from KEB Hana Bank [member] Member skm:CommercialPaperFromKEBHanaBankMember
1726 Bank overdraft from KEB Hana Bank [member] Member skm:BankOverdraftFromKEBHanaBankMember
1727 Bank overdraft from Shinhan Bank [member] Member skm:BankOverdraftFromShinhanBankMember
1728 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1729 Annual interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1730 Short-term borrowings Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
1731 1148 - Disclosure - Borrowings and Debentures - Long-term Borrowings (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBorrowingsAndDebenturesLongtermBorrowings
1732 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1733 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
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1735 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1736 Present value discount [Member] Member skm:PresentValueDiscountMember
1737 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1738 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1739 Korea Development Bank Longterm Borrowings with 3.20 Percent Interest Due March 31 2020 [member] Member skm:KoreaDevelopmentBankLongtermBorrowingsWith3Point20PercentInterestDueMarch312020Member
1740 KEB Hana bank longterm borrowings with3.51 percent interest due February 28 2019 [member] Member skm:KebHanaBankLongtermBorrowingsWith3Point51PercentInterestDueFebruary282019Member
1741 Kookmin Bank Longterm Borrowings With 1.95 Percent Interest Due March 15 2018 [member ] Member skm:KookminBankLongtermBorrowingsWith1Point95PercentInterestDueMarch152018Member
1742 Korea Development Bank longterm borrowings with 2.2 % interest due Jul. 30, 2019 [member] Member skm:KoreaDevelopmentBankLongtermBorrowingsWith2Point2PercentInterestDueJul302019Member
1743 Korea Development Bank long term borrowings with 2.2 % interest due Jul. 30, 2019 two [member] Member skm:KoreaDevelopmentBankLongtermBorrowingsWithTwoPointTwoPercentInterestDueJul302019TwoMember
1744 Korea Development Bank long-term borrowings with 2.32% interest due December 20, 2021 [Member] Member skm:KoreaDevelopmentBankLongtermBorrowingsWith2Point32PercentInterestDueDecember202021Member
1745 Korea Development Bank long term borrowings with 2.78 % interest due Dec. 21, 2022 [member] Member skm:KoreaDevelopmentBankLongtermBorrowingsWith2Point78PercentInterestDueDec212022Member
1746 Credit Agricole CIB [member] Member skm:CreditAgricoleCorporateAndInvestmentBankLongTermBorrowingsWithTwoPointSevenTwoPercentInterestDueDecember142023Member
1747 Export Kreditnamnden long-term borrowings with 1.70% interest due April 29, 2022 [member] Member skm:ExportKreditnamndenLongtermBorrowingsWith1Point70PercentInterestDueApril292022Member
1748 Shinhan Bank and others long term borrowings with 4.21% due September 30 2023 [member] Member skm:ShinhanBankAndOthersLongtermBorrowingsWith4Point21PercentageDueSeptember302023Member
1749 Shinhan bank and others longterm borrowings with 7.20% due September 30 2023 [member] Member skm:ShinhanBankAndOthersLongtermBorrowingsWith7Point20PercentageDueSeptember302023Member
1750 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1751 Annual interest rate (%) Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1752 Maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
1753 Long-term borrowings Concept (Monetary) As Of Credit ifrs-full:LoansReceived
1754 Less current installments Concept (Monetary) As Of Credit ifrs-full:CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived
1755 Long-term borrowings, excluding current installments Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentLoansReceived
1756 1149 - Disclosure - Borrowings and Debentures - Debentures (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureBorrowingsAndDebenturesDebentures
1757 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1758 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1759 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1760 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1761 Discounts on bonds [member] Member skm:DiscountsOnBondsMember
1762 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1763 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1764 Unsecured private bonds with 5.00% interest due 2016 [Member] Member skm:UnsecuredCorporateBondsWith5Point00PercentInterestDue2018Member
1765 Unsecured private bonds with 4.22% interest due 2021 [Member] Member skm:UnsecuredCorporateBondsWith4Point22PercentInterestDue2021Member
1766 Unsecured private bonds with 3.24% interest due 2019 [Member] Member skm:UnsecuredCorporateBondsWith3Point24PercentInterestDue2019Member
1767 Unsecured private bonds with 3.30% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith3Point30PercentInterestDue2022Member
1768 Unsecured private bonds with 3.45% interest due 2032 [Member] Member skm:UnsecuredCorporateBondsWith3Point45PercentInterestDue2032Member
1769 Unsecured private bonds with 3.03% interest due 2023 [Member] Member skm:UnsecuredCorporateBondsWith3Point03PercentInterestDue2023Member
1770 Unsecured private bonds with 3.22% interest due 2033 [Member] Member skm:UnsecuredCorporateBondsWith3Point22PercentInterestDue2033Member
1771 Unsecured private bonds with 3.30% interest due 2019 [Member] Member skm:UnsecuredCorporateBondsWith3Point30PercentInterestDue2019Member
1772 Unsecured private bonds with 3.64% interest due 2024 [Member] Member skm:UnsecuredCorporateBondsWith3Point64PercentInterestDue2024Member
1773 Unsecured private bonds with 4.72% interest due 2029 [Member] Member skm:UnsecuredCorporateBondsWith4Point72PercentInterestDue2029Member
1774 Unsecured private bonds with 2.53% interest due 2019 [Member] Member skm:UnsecuredCorporateBondsWith2Point53PercentInterestDue2019Member
1775 Unsecured private bonds with 2.66% interest due 2021 [Member] Member skm:UnsecuredCorporateBondsWith2Point66PercentInterestDue2021Member
1776 Unsecured private bonds with 2.82% interest due 2024 [Member] Member skm:UnsecuredCorporateBondsWith2Point82PercentInterestDue2024Member
1777 Unsecured private bonds with 2.40% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith2Point40PercentInterestDue2022Member
1778 Unsecured private bonds with 2.49% interest due 2025 [Member] Member skm:UnsecuredCorporateBondsWith2Point49PercentInterestDue2025Member
1779 Unsecured private bonds with 2.61% interest due 2030 [Member] Member skm:UnsecuredCorporateBondsWith2Point61PercentInterestDue2030Member
1780 Unsecured private bonds with 1.89% interest due 2018 [Member] Member skm:UnsecuredCorporateBondsWith1Point89PercentInterestDue2018Member
1781 Unsecured private bonds with 2.66% interest due 2025 [Member] Member skm:UnsecuredCorporateBondsWith2Point66PercentInterestDue2025Member
1782 Unsecured private bonds with 2.82% interest due 2030 [Member] Member skm:UnsecuredCorporateBondsWith2Point82PercentInterestDue2030Member
1783 Unsecured private bonds with 2.07% interest due 2018 [Member] Member skm:UnsecuredCorporateBondsWith2Point07PercentInterestDue2018Member
1784 Unsecured private bonds with 2.55% interest due 2025 [Member] Member skm:UnsecuredCorporateBondsWith2Point55PercentInterestDue2025Member
1785 Unsecured private bonds with 2.75% interest due 2035 [Member] Member skm:UnsecuredCorporateBondsWith2Point75PercentInterestDue2035Member
1786 Unsecured private bonds with 1.65% interest due 2019 [Member] Member skm:UnsecuredCorporateBondsWith1Point65PercentInterestDue2019Member
1787 Unsecured private bonds with 1.80% interest due 2021 [Member] Member skm:UnsecuredCorporateBondsWith1Point80PercentInterestDue2021Member
1788 Unsecured private bonds with 2.08% interest due 2026 [Member] Member skm:UnsecuredCorporateBondsWith2Point08PercentInterestDue2026Member
1789 Unsecured private bonds with 2.24% interest due 2036 [Member] Member skm:UnsecuredCorporateBondsWith2Point24PercentInterestDue2036Member
1790 Unsecured private bonds with 1.62% interest due 2019 [Member] Member skm:UnsecuredCorporateBondsWith1Point62PercentInterestDue2019Member
1791 Unsecured private bonds with 1.71% interest due 2021 [Member] Member skm:UnsecuredCorporateBondsWith1Point71PercentInterestDue2021Member
1792 Unsecured private bonds with 1.97% interest due 2026 [Member] Member skm:UnsecuredCorporateBondsWith1Point97PercentInterestDue2026Member
1793 Unsecured private bonds with 2.17% interest due 2031 [member] Member skm:UnsecuredCorporateBondsWith2Point17PercentInterestDue2031Member
1794 Unsecured corporate bonds with 1.93% interest due 2020 [member] Member skm:UnsecuredCorporateBondsWith1Point93PercentInterestDue2020Member
1795 Unsecured corporate bonds with 2.17% interest due 2022.[member] Member skm:UnsecuredCorporateBondsWith2Point17PercentInterestDue2022Member
1796 Unsecured corporate bonds with 2.55% interest due 2027 [member] Member skm:UnsecuredCorporateBondsWith2Point55PercentInterestDue2027Member
1797 Unsecured corporate bonds with 2.65% interest due 2032 [member] Member skm:UnsecuredCorporateBondsWith2Point65PercentInterestDue2032Member
1798 Unsecured corporate bonds with 2.39% interest due 2020 [member] Member skm:UnsecuredCorporateBondsWith2Point39PercentInterestDue2020Member
1799 Unsecured corporate bonds with 2.63% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith2Point63PercentageInterestDue2022Member
1800 Unsecured private bonds with 4.28% interest due 2017 [member] Member skm:UnsecuredCorporateBondsWith4Point28PercentInterestDue2017Member
1801 Unsecured corporate bonds with 2.57% interest due 2021 [member] Member skm:UnsecuredCorporateBondsWith2Point57PercentInterestDue2021Member
1802 Unsecured corporate bonds with 2.81% interest due 2023 [member] Member skm:UnsecuredCorporateBondsWith2Point81PercentInterestDue2023Member
1803 Unsecured corporate bonds with 3 % interest due 2028 [member] Member skm:UnsecuredCorporateBondsWithThreePercentInterestDue2028Member
1804 Unsecured corporate bonds with 3.2% interest due 2038 [member] Member skm:UnsecuredCorporateBondsWith3Point2PercentInterestDue2038Member
1805 Unsecured corporate bonds with 2.1% interest due 2021 [member] Member skm:UnsecuredCorporateBondsWith2Point1PercentInterestDue2021Member
1806 Unsecured corporate bonds with 2.33% interest due 2023 [member] Member skm:UnsecuredCorporateBondsWith2Point33PercentInterestDue2023Member
1807 Unsecured corporate bonds with 2.44% interest due 2038 [member] Member skm:UnsecuredCorporateBondsWith2Point44PercentInterestDue2038Member
1808 Unsecured corporate bonds with 2 point 84 percent interest due 2027 [member] Member skm:UnsecuredCorporateBondsWith2Point84PercentInterestDue2027Member
1809 Unsecured corporate bonds with 3.49% interest due 2019 [member] Member skm:UnsecuredCorporateBondsWith3Point49PercentInterestDue2019Member
1810 Unsecured corporate bonds with 2.76% interest due 2019 [member] Member skm:UnsecuredCorporateBondsWith2Point76PercentInterestDue2019Member
1811 Unsecured corporate bonds with 2.23% interest due 2018 [member] Member skm:UnsecuredCorporateBondsWith2Point23PercentInterestDue2018Member
1812 Unsecured corporate bonds with 2.49% interest due 2020 [member] Member skm:UnsecuredCorporateBondsWith2Point49PercentInterestDue2020Member
1813 Unsecured corporate bonds with 2.43% interest due 2020 [member] Member skm:UnsecuredCorporateBondsWith2Point43PerrcentInterestDue2020Member
1814 Unsecured corporate bonds with 2.18% interest due 2020 [member] Member skm:UnsecuredCorporateBondsWith2Point18PercentInterestDue2020Member
1815 Unsecured corporate bonds with 1.58% interest due 2019 [member] Member skm:UnsecuredCorporateBondsWith1Point58PercentInterestDue2019Member
1816 Unsecured corporate bonds with 1.77% interest due 2021 [member] Member skm:UnsecuredCorporateBondsWith1Point77PercentInterestDue2021Member
1817 Unsecured corporate bonds with 2.26% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith2Point26PercentInterestDue2022Member
1818 Unsecured corporate bonds with 2.34% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith2Point34PercentInterestDue2022Member
1819 Unsecured corporate bonds with 2.70% interest due 2022 [member] Member skm:UnsecuredCorporateBondsWith2Point70PercentInterestDue2022Member
1820 Unsecured corporate bonds with 2.59% interest due 2021 [member] Member skm:UnsecuredCorporateBondsWith2Point59PercentInterestDue2021Member
1821 Unsecured corporate bonds with 2.93% interest due 2021 [member] Member skm:UnsecuredCorporateBondsWith2Point93PercentInterestDue2023Member
1822 Corporate bonds with 1 % interest due 2019 [member] Member skm:CorporateBondsWith1Point00PercentInterestDue2019Member
1823 Unsecured global bonds with 6.63% interest due 2027 [member] Member skm:UnsecuredGlobalBondsWith6Point63PercentInterestDue2027Member
1824 Unsecured global bonds with 2.13% interest due 2018 [Member] Member skm:UnsecuredGlobalBondsWith2Point13PercentInterestDue2018Member
1825 Unsecured global bonds with 3.75% interest due 2023 [member] Member skm:UnsecuredGlobalBondsWith3Point75PercentInterestDue2023Member
1826 Unsecured global bonds with 3.88% interest due 2023 [member] Member skm:UnsecuredGlobalBondsWith3Point88PercentInterestDue2023Member
1827 Unsecured global bonds with 2.88% interest due 2023 [member] Member skm:UnsecuredGlobalBondsWith2Point88PercentInterestDue2023Member
1828 Floating rate notes with 3M LIBOR + 0.88% interest due 2020 [member] Member skm:FloatingRateNotesWith3MonthLiborPlus0Point88PercentInterestDue2020Member
1829 Unsecured global bonds with 2.13% interest due 2027 [member] Member skm:UnsecuredGlobalBondsWithTwoPoint13PercentInterestDue2018Member
1830 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1831 Maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
1832 Annual interest rate (%) Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1833 Annual interest rate description Concept (Text/String) For Period ifrs-full:BorrowingsInterestRateBasis
1834 Annual interest rate adjustment (%) Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
1835 Debentures Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
1836 Less current installments of bonds Concept (Monetary) As Of Credit ifrs-full:CurrentNotesAndDebenturesIssuedAndCurrentPortionOfNoncurrentNotesAndDebenturesIssued
1837 Debentures, excluding current installments, net Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentNotesAndDebenturesIssued
1838 1150 - Disclosure - Borrowings and Debentures - Debentures (Parenthetical) (Detail) Network

*

*

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1839 Disclosure of detailed information about borrowings [table] Table

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*

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1840 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1841 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1842 3M LIBOR [Member] Member skm:LIBORMember
1843 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1844 Excess carrying amount of financial liabilities designated at fair value through profit or loss over the principal amount Concept (Monetary) As Of ifrs-full:DifferenceBetweenCarryingAmountOfFinancialLiabilityAndAmountContractuallyRequiredToPayAtMaturityToHolderOfObligation
1845 Annual interest rate (%) Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1846 1151 - Disclosure - Long-term Payables Other - Summary of Long-term Payables - Other (Detail) Network

*

*

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1847 Implied Table Table

*

*

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1848 Trade and other non-current payables [abstract] Abstract ifrs-full:NoncurrentPayablesAbstract
1849 Payables related to acquisition of frequency usage rights Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesForPurchaseOfNoncurrentAssets
1850 Other Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentPayables
1851 Other non current payables Concept (Monetary) As Of Credit skm:LongtermPayablesOther
1852 1152 - Disclosure - Long-term Payables Other - Details of Long-term Payables - Other, Which Consist of Payables Related to the Acquisition of Frequency Usage Rights (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureLongtermPayablesOtherDetailsOfLongtermPayablesOtherWhichConsistOfPayablesRelatedToTheAcquisitionOfFrequencyUsageRights
1853 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1854 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1855 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1856 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1857 Present value discount [Member] Member skm:PresentValueDiscountMember
1858 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1859 Long-term payables-other Concept (Monetary) As Of Credit ifrs-full:PayablesForPurchaseOfNoncurrentAssets
1860 Current installments of long-term payables - other Concept (Monetary) As Of Credit skm:CurrentPayablesForPurchaseOfNoncurrentAssetsAttributableToOwnersOfParent
1861 Carrying amount at December 31 Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesForPurchaseOfNoncurrentAssets
1862 1153 - Disclosure - Long-term Payables Other - Repayment Schedule of the Principal Amount of Long-term Payables - Other Related to Acquisition of Frequency Usage Rights (Detail) Network

*

*

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1863 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1864 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1865 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
1866 Gross amount [member] Member ifrs-full:GrossCarryingAmountMember
1867 Maturity [axis] Axis ifrs-full:MaturityAxis
1868 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1869 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
1870 1 - 3 years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1871 3 - 5 years [Member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
1872 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
1873 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1874 Payables related to acquisition of frequency usage rights Concept (Monetary) As Of Credit ifrs-full:PayablesForPurchaseOfNoncurrentAssets
1875 1154 - Disclosure - Provisions - Changes in Provisions (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureProvisionsChangesInProvisions
1876 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
1877 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1878 Provisions [Member] Member ifrs-full:OtherProvisionsMember
1879 Provision for installment of handset subsidy [Member] Member skm:ProvisionForInstallmentOfHandsetSubsidyMember
1880 Provision for restoration [Member] Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
1881 Emission allowance [Member] Member ifrs-full:OtherEnvironmentRelatedProvisionMember
1882 Other provisions [Member] Member ifrs-full:MiscellaneousOtherProvisionsMember
1883 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
1884 Currently stated [member] Member ifrs-full:RestatedMember
1885 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
1886 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1887 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Provisions
1888 Impact of adopting IFRS 15 Concept (Monetary) For Period ifrs-full:AmountOfReclassificationsOrChangesInPresentation
1889 Increase Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
1890 Utilization Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
1891 Reversal Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
1892 Other Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions
1893 Business Combination Concept (Monetary) For Period Credit ifrs-full:AcquisitionsThroughBusinessCombinationsOtherProvisions
1894 Ending balance Concept (Monetary) As Of Credit ifrs-full:Provisions
1895 Current Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
1896 Non-current Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
1897 1155 - Disclosure - Provisions - Changes in Provisions (Parenthetical) (Detail) Network

*

*

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1898 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
1899 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1900 Provisions [Member] Member ifrs-full:OtherProvisionsMember
1901 Legal proceedings provision [member] Member ifrs-full:LegalProceedingsProvisionMember
1902 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1903 Current provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
1904 Non-current provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
1905 1156 - Disclosure - Lease - Expected Future Lease Payments (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureLeaseExpectedFutureLeasePayments
1906 Disclosure of detailed information about arrangements involving legal form of lease [table] Table

*

*

 ifrs-full:DisclosureOfArrangementsInvolvingLegalFormOfLeaseTable
1907 Maturity [axis] Axis ifrs-full:MaturityAxis
1908 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1909 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
1910 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1911 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
1912 Disclosure of detailed information about arrangements involving legal form of lease [line items] LineItems ifrs-full:DisclosureOfArrangementsInvolvingLegalFormOfLeaseLineItems
1913 Minimum lease payments Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1914 1157 - Disclosure - Defined Benefit Liabilities (Assets) - Details of Defined Benefit Liabilities (Assets) (Detail) Network

*

*

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1915 Implied Table Table

*

*

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1916 Disclosure of defined benefit plans [abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
1917 Present value of defined benefit obligations Concept (Monetary) As Of Credit ifrs-full:DefinedBenefitObligationAtPresentValue
1918 Fair value of plan assets Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
1919 Defined benefit assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan
1920 Defined benefit liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
1921 1158 - Disclosure - Defined Benefit Liabilities (Assets) - Principal Actuarial Assumptions (Detail) Network

*

*

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1922 Disclosure of defined benefit plans [table] Table

*

*

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1923 Range [axis] Axis ifrs-full:RangeAxis
1924 Ranges [member] Member ifrs-full:RangesMember
1925 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1926 Top of range [member] Member ifrs-full:TopOfRangeMember
1927 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1928 Discount rate for defined benefit obligations Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfDiscountRates
1929 Expected rate of salary increase Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
1930 1159 - Disclosure - Defined Benefit Liabilities (Assets) - Changes in Defined Benefit Obligations (Detail) Network

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*

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1931 Disclosure of defined benefit plans [table] Table

*

*

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1932 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
1933 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
1934 Retirement benefit obligation [Member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
1935 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1936 Beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1937 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
1938 Interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
1939 Remeasurement Abstract ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
1940 - Demographic assumption Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
1941 - Financial assumption Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
1942 - Adjustment based on experience Concept (Monetary) For Period Debit skm:ActuarialGainsLossesArisingFromChangesInExperienceAdjustmentNetDefinedBenefitLiabilityAsset
1943 Benefit paid Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
1944 Business combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsAndDisposalsNetDefinedBenefitLiabilityAsset
1945 Others Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
1946 Ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1947 1160 - Disclosure - Defined Benefit Liabilities (Assets) - Changes in Plan Assets (Detail) Network

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*

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1948 Disclosure of fair value of plan assets [table] Table

*

*

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1949 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
1950 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
1951 Plan assets [member] Member ifrs-full:PlanAssetsMember
1952 Disclosure of fair value of plan assets [line items] LineItems ifrs-full:DisclosureOfFairValueOfPlanAssetsLineItems
1953 Beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1954 Interest income Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
1955 Remeasurement Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
1956 Contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanNetDefinedBenefitLiabilityAsset
1957 Benefit paid Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
1958 Business combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsAndDisposalsNetDefinedBenefitLiabilityAsset
1959 Others Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
1960 Ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1961 1161 - Disclosure - Defined Benefit Liabilities (Assets) - Additional Information (Detail) Network

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*

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1962 Implied Table Table

*

*

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1963 Disclosure of defined benefit plans [abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
1964 Expected contributions in 2018 Concept (Monetary) For Period Credit ifrs-full:EstimateOfContributionsExpectedToBePaidToPlan
1965 Weighted average durations of defined benefit obligations Concept (Decimal) For Period ifrs-full:WeightedAverageDurationOfDefinedBenefitObligation
1966 1162 - Disclosure - Defined Benefit Liabilities (Assets) - Total Amount of Expenses Recognized in Profit and Loss (Detail) Network

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*

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1967 Implied Table Table

*

*

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1968 Disclosure of defined benefit plans [abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
1969 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
1970 Net interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
1971 Total amount of expenses recognized in profit and loss Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
1972 1163 - Disclosure - Defined Benefit Liabilities (Assets) - Details of Plan Assets (Detail) Network

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*

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1973 Implied Table Table

*

*

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1974 Disclosure of defined benefit plans [abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
1975 Equity instruments Concept (Monetary) As Of Debit ifrs-full:EquityInstrumentsAmountContributedToFairValueOfPlanAssets
1976 Debt instruments Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsAmountContributedToFairValueOfPlanAssets
1977 Short-term financial instruments, etc. Concept (Monetary) As Of Debit ifrs-full:InvestmentFundsAmountContributedToFairValueOfPlanAssets
1978 Fair value of plan assets Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
1979 1164 - Disclosure - Defined Benefit Liabilities (Assets) - Effects on Defined Benefit Obligations if Each of Significant Actuarial Assumptions Changes Within Expectable and Reasonable Range (Detail) Network

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1980 Disclosure of sensitivity analysis for actuarial assumptions [table] Table

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1981 Actuarial assumptions [axis] Axis ifrs-full:ActuarialAssumptionsAxis
1982 Actuarial assumptions [member] Member ifrs-full:ActuarialAssumptionsMember
1983 Discount rate [Member] Member ifrs-full:ActuarialAssumptionOfDiscountRatesMember
1984 Expected salary increase rate [Member] Member ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember
1985 Disclosure of sensitivity analysis for actuarial assumptions [line items] LineItems ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
1986 Increase in defined benefit obligations Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
1987 Increase in assumption Concept (Percent) As Of ifrs-full:PercentageOfReasonablyPossibleIncreaseInActuarialAssumption
1988 Decrease in defined benefit obligations Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
1989 Decrease in assumption Concept (Percent) As Of ifrs-full:PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
1990 1165 - Disclosure - Derivative Instruments - Currency and Interest Rate Swap Contracts under Cash Flow Hedge Accounting (Detail) Network

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1991 Disclosure of detailed information about hedging instruments [table] Table

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1992 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1993 Hedging Instruments [Member] Member ifrs-full:HedgingInstrumentsMember
1994 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapOneMember
1995 Fixed-to-fixed cross currency swap, Mar. 7, 2013 [member] Member skm:FloatingToFixedCrossCurrencyInterestRateSwapMember
1996 Floating-to-fixed interest rate swap, Dec.16, 2013 [member] Member skm:FixedToFixedCrossCurrencySwapFourMember
1997 Fixed-to-fixed Cross Currency Swap, Apr. 16, 2018 [Member] Member skm:FixedToFixedCrossCurrencySwapFiveMember
1998 Fixed-to-fixed Cross Currency Swap, Aug. 13, 2018 [Member] Member skm:FixedToFixedCrossCurrencySwapSixMember
1999 Floating-to-fixed interest rate swap, Dec. 20, 2016 [member] Member skm:FloatingToFixedInterestRateSwapOneMember
2000 Floating-to-fixed Interest Rate Swap, Jan. 30, 2017 [Member] Member skm:FloatingToFixedInterestRateSwapTwoMember
2001 Floating-to-fixed interest rate swap, Dec. 21, 2017 [member] Member skm:FloatingtofixedInterestRateSwapFourMember
2002 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
2003 Borrowing date Concept (Date) For Period skm:BorrowingIssuanceDate
2004 Hedging Instrument(Hedged item) Concept (Text/String) For Period ifrs-full:DescriptionOfHedgingInstrumentsUsedToHedgeRiskExposuresAndHowTheyAreUsed
2005 Hedged risk Concept (Text/String) For Period ifrs-full:DescriptionOfTypeOfHedge
2006 Financial institution Concept (Text/String) For Period skm:NameOfFinancialInstitution
2007 Duration of contract Concept (Text/String) For Period skm:DurationOfContract
2008 1166 - Disclosure - Derivative Instruments - Currency and Interest Rate Swap Contracts under Cash Flow Hedge Accounting (Parenthetical) (Detail) Network

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2009 Disclosure of detailed information about hedging instruments [table] Table

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2010 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
2011 Hedging Instruments [Member] Member ifrs-full:HedgingInstrumentsMember
2012 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapOneMember
2013 Fixed-to-fixed cross currency swap, Mar. 7, 2013 [member] Member skm:FloatingToFixedCrossCurrencyInterestRateSwapMember
2014 Floating-to-fixed interest rate swap, Dec.16, 2013 [member] Member skm:FixedToFixedCrossCurrencySwapFourMember
2015 Floating-to-fixed Interest Rate Swap, Jan. 30, 2017 [Member] Member skm:FloatingToFixedInterestRateSwapTwoMember
2016 Floating-to-fixed interest rate swap, Dec. 21, 2017 [member] Member skm:FloatingtofixedInterestRateSwapFourMember
2017 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapTwoMember
2018 Fixed-to-fixed cross currency swap, Dec. 16, 2013 [member] Member skm:FixedToFixedCrossCurrencySwapThreeMember
2019 Floating-to-fixed interest rate swap, Jan. 30, 2017 [member] Member skm:FloatingtofixedInterestRateSwapThreeMember
2020 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
2021 Hedges [member] Member ifrs-full:TypesOfHedgesMember
2022 Total return swaps [member] Member skm:TotalReturnSwapsMember
2023 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
2024 Lease contract amount Concept (Monetary) As Of Credit skm:LeaseContractAmount
2025 Bonds face value Concept (Monetary) As Of ifrs-full:NotionalAmount
2026 1167 - Disclosure - Derivative Instruments - Details of Fair Values of the Above Derivatives Recorded in Assets or Liabilities (Detail) Network

*

*

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2027 Disclosure of detailed information about hedged items [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsTable
2028 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
2029 Equity [member] Member ifrs-full:EquityMember
2030 Held for trading [member] Member skm:HeldForTradingMember
2031 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
2032 Hedging Instruments [Member] Member ifrs-full:HedgingInstrumentsMember
2033 Structured bonds [member] Member skm:StructuredBondMember
2034 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapOneMember
2035 Floating-to-fixed interest rate swap, Dec. 20, 2016 [member] Member skm:FloatingToFixedInterestRateSwapOneMember
2036 Floating-to-fixed Interest Rate Swap, Jan. 30, 2017 [Member] Member skm:FloatingToFixedInterestRateSwapTwoMember
2037 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapTwoMember
2038 Fixed-to-fixed cross currency swap, Mar. 7, 2013 [member] Member skm:FloatingToFixedCrossCurrencyInterestRateSwapMember
2039 Fixed to fixed long term borrowings [member] Member skm:FixedToFixedLongTermBorrowingsMember
2040 Fixed to fixed long term bonds [member] Member skm:FixedToFixedLongTermBondsMember
2041 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
2042 Hedges [member] Member ifrs-full:TypesOfHedgesMember
2043 Cash flow hedge [member] Member ifrs-full:CashFlowHedgesMember
2044 Fair value [member] Member ifrs-full:FairValueHedgesMember
2045 Disclosure of detailed information about hedged items [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsLineItems
2046 Short-term derivative financial assets Concept (Monetary) As Of Debit ifrs-full:CurrentDerivativeFinancialAssets
2047 Others Concept (Monetary) As Of Debit skm:OtherDerivativeFinancialAssets
2048 Long-term derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
2049 Long-term derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
2050 Derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
2051 1168 - Disclosure - Derivative Instruments - Details of Fair Values of the Above Derivatives Recorded in Assets or Liabilities (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureDerivativeInstrumentsDetailsOfFairValuesOfTheAboveDerivativesRecordedInAssetsOrLiabilitiesParenthetical
2052 Disclosure of detailed information about hedged items [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsTable
2053 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
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2055 Structured bonds [member] Member skm:StructuredBondMember
2056 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapOneMember
2057 Floating-to-fixed interest rate swap, Dec. 20, 2016 [member] Member skm:FloatingToFixedInterestRateSwapOneMember
2058 Fixed-to-fixed cross currency swap, Jul. 20, 2007 [member] Member skm:FixedToFixedCrossCurrencySwapTwoMember
2059 Fixed-to-fixed cross currency swap, Dec. 16, 2013 [member] Member skm:FixedToFixedCrossCurrencySwapThreeMember
2060 Fixed-to-fixed cross currency swap, Mar. 7, 2013 [member] Member skm:FloatingToFixedCrossCurrencyInterestRateSwapMember
2061 Floating-to-fixed interest rate swap, Dec.16, 2013 [member] Member skm:FixedToFixedCrossCurrencySwapFourMember
2062 Floating-to-fixed interest rate swap, Jan. 30, 2017 [member] Member skm:FloatingtofixedInterestRateSwapThreeMember
2063 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
2064 Hedges [member] Member ifrs-full:TypesOfHedgesMember
2065 Fair value [member] Member ifrs-full:FairValueHedgesMember
2066 Disclosure of detailed information about hedged items [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsLineItems
2067 Bonds face value Concept (Monetary) As Of ifrs-full:NotionalAmount
2068 1169 - Disclosure - Share Capital and Capital Surplus (deficit) and Others - Additional Information (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareCapitalAndCapitalSurplusdeficitAndOthersAdditionalInformation
2069 Implied Table Table

*

*

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2070 Disclosure of classes of share capital [abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
2071 Common shares, par value Concept (Share) As Of ifrs-full:ParValuePerShare
2072 1170 - Disclosure - Share Capital and Capital Surplus (deficit) and Others - Number of Authorized, Issued and Outstanding Common Shares and the Details of Capital Surplus (Deficit) and Others (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareCapitalAndCapitalSurplusdeficitAndOthersNumberOfAuthorizedIssuedAndOutstandingCommonSharesAndTheDetailsOfCapitalSurplusDeficitAndOthers
2073 Implied Table Table

*

*

 implied:Table
2074 Disclosure of classes of share capital [abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
2075 Number of authorized shares Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
2076 Number of issued shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
2077 Share capital: Abstract skm:ShareCapitalAbstract
2078 Common share Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2079 Capital surplus and others: Abstract skm:CapitalSurplusAndOthersAbstract
2080 Paid-in surplus Concept (Monetary) As Of Credit ifrs-full:AdditionalPaidinCapital
2081 Treasury shares (note 24) Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2082 Share option (note 26) Concept (Monetary) As Of Credit ifrs-full:ReserveOfSharebasedPayments
2083 Others Concept (Monetary) As Of Credit skm:OtherCapitalSurplusDeficit
2084 Capital Surplus Concept (Monetary) As Of Credit skm:CapitalSurplusDeficitAndOthers
2085 1171 - Disclosure - Share Capital and Capital Surplus (deficit) and Others - Details of Shares Outstanding (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareCapitalAndCapitalSurplusdeficitAndOthersDetailsOfSharesOutstanding
2086 Implied Table Table

*

*

 implied:Table
2087 Reconciliation of number of shares outstanding [abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
2088 Issued shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
2089 Treasury shares Concept (Shares) As Of skm:NumberOfTreasuryShares
2090 Outstanding shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2091 1172 - Disclosure - Treasury Shares - Summary of Treasury Shares (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTreasurySharesSummaryOfTreasuryShares
2092 Implied Table Table

*

*

 implied:Table
2093 Disclosure of classes of share capital [abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
2094 Number of shares Concept (Shares) As Of skm:NumberOfTreasuryShares
2095 Acquisition cost Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2096 1173 - Disclosure - Treasury Shares - Summary of Treasury Shares (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTreasurySharesSummaryOfTreasurySharesParenthetical
2097 Treasury shares transaction [table] Table

*

*

 skm:TreasurySharesTransactionTable
2098 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2099 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2100 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
2101 Treasury shares transaction [line items] LineItems skm:TreasurySharesTransactionLineItems
2102 Number of treasury shares decreased Concept (Shares) For Period skm:DecreaseInTreasurySharesHeld
2103 1174 - Disclosure - Hybrid Bonds - Summary of Hybrid Bonds (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureHybridBondsSummaryOfHybridBonds
2104 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
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2106 Carrying amount [Member] Member ifrs-full:CarryingAmountMember
2107 Issuance costs [Member] Member skm:IssuanceCostMember
2108 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
2109 Equity [member] Member ifrs-full:EquityMember
2110 Series 2-1 hybrid bonds [member] Member skm:HybridBondSeriesTwoToOneMember
2111 Series 2-2 hybrid bonds [member] Member skm:HybridBondSeriesTwoToTwoMember
2112 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
2113 Type Concept (Text/String) For Period ifrs-full:DescriptionOfOtherEquityInterest
2114 Issuance date Concept (Date) For Period skm:BorrowingIssuanceDate
2115 Maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
2116 Annual interest rate(%) Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2117 Series hybrid bonds Concept (Monetary) As Of Credit ifrs-full:OtherEquityInterest
2118 1175 - Disclosure - Hybrid Bonds - Summary of Hybrid Bonds (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureHybridBondsSummaryOfHybridBondsParenthetical
2119 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
2120 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
2121 Equity [member] Member ifrs-full:EquityMember
2122 Private hybrid bonds [Member] Member skm:PrivateHybridBondsMember
2123 Maturity [axis] Axis ifrs-full:MaturityAxis
2124 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2125 After 10 years [Member] Member skm:PeriodOneMember
2126 After 25 years [Member] Member skm:PeriodTwoMember
2127 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
2128 Annual interest rate, additional premium Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
2129 Annual interest rate, additional premium period Concept (xbrli:durationItemType) For Period skm:BondAnnualInterestCalculationYieldRatePeriod
2130 1176 - Disclosure - Share Option - Summary of Terms and Conditions Related to Grants of Share Options under Share Option Program (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareOptionSummaryOfTermsAndConditionsRelatedToGrantsOfShareOptionsUnderShareOptionProgram
2131 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

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2132 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
2133 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
2134 Series 1-1 [member] Member skm:SeriesOneOneMember
2135 Series 1-2 [member] Member skm:SeriesOneTwoMember
2136 Series 1-3 [member] Member skm:SeriesOneThreeMember
2137 Series 2 [member] Member skm:SeriesOneFourMember
2138 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2139 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2140 One Store Co., Ltd. [member] Member skm:OneStoreCoLtdMember
2141 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
2142 Grant date Concept (Text/String) For Period ifrs-full:DateOfGrantOfSharebasedPaymentArrangement
2143 Types of shares to be issued Concept (Text/String) For Period skm:DescriptionOfTypesOfSharesToBeIssuedInSharebasedPaymentArrangement
2144 Grant method Concept (Text/String) For Period skm:DescriptionOfGrantMethodUsedInSharebasedPaymentArrangement
2145 Number of shares Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsGrantedInSharebasedPaymentArrangement
2146 Exercise price Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
2147 Exercise period Concept (Text/String) For Period ifrs-full:DescriptionOfMaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
2148 Vesting conditions Concept (Text/String) For Period ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
2149 1177 - Disclosure - Share Option - Summary of Share Compensation Expense Recognized (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareOptionSummaryOfShareCompensationExpenseRecognized
2150 Disclosure Of Share Based Compensation Expense [table] Table

*

*

 skm:DisclosureOfShareBasedCompensationExpenseTable
2151 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
2152 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
2153 Major Share Options Transactions [member] Member skm:MajorShareOptionsTransactionsMember
2154 Events including and after reporting period [member] Member skm:EventsIncludingAndAfterReportingPeriodMember
2155 Disclosure Of Share Based Compensation Expense [line items] LineItems skm:DisclosureOfShareBasedCompensationExpenseLineItems
2156 Share compensation expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
2157 1178 - Disclosure - Share Option - Summary of Inputs Used in Binomial Option Pricing Model (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureShareOptionSummaryOfInputsUsedInBinomialOptionPricingModel
2158 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
2159 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2160 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2161 One Store Co., Ltd. [member] Member skm:OneStoreCoLtdMember
2162 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
2163 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
2164 Series 1-1 [member] Member skm:SeriesOneOneMember
2165 Series 1-2 [member] Member skm:SeriesOneTwoMember
2166 Series 1-3 [member] Member skm:SeriesOneThreeMember
2167 Series 2 [member] Member skm:SeriesOneFourMember
2168 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
2169 Risk-free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
2170 Estimated option's life Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
2171 Share price(*) (Closing price on the preceding day in won) Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
2172 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
2173 Expected dividends Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
2174 Exercise price Concept (Monetary) For Period ifrs-full:ExercisePriceShareOptionsGranted
2175 Per share fair value of the option Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
2176 1179 - Disclosure - Retained Earnings - Summary of Retained Earnings (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureRetainedEarningsSummaryOfRetainedEarnings
2177 Implied Table Table

*

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 implied:Table
2178 Disclosure of reserves within equity [abstract] Abstract ifrs-full:DisclosureOfReservesWithinEquityAbstract
2179 Legal reserve Concept (Monetary) As Of Credit ifrs-full:StatutoryReserve
2180 Reserve for business expansion Concept (Monetary) As Of Credit skm:ReserveForBusinessExpansion
2181 Reserve for technology development Concept (Monetary) As Of Credit skm:ReserveForTechnologyDevelopment
2182 Appropriated retained earnings Concept (Monetary) As Of Credit skm:RetainedEarningsAppropriated1
2183 Unappropriated retained earnings Concept (Monetary) As Of Credit skm:RetainedEarningsUnappropriated1
2184 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
2185 1180 - Disclosure - Retained Earnings - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureRetainedEarningsAdditionalInformation
2186 Implied Table Table

*

*

 implied:Table
2187 Disclosure of reserves within equity [abstract] Abstract ifrs-full:DisclosureOfReservesWithinEquityAbstract
2188 Legal reserve as a percentage of cash dividends paid Concept (Percent) For Period skm:MinimumStatutoryReservePercentage
2189 Legal reserve as a percentage of outstanding share capital Concept (Percent) For Period skm:LegalReserveAsPercentageOfOutstandingShareCapital
2190 1181 - Disclosure - Reserves - Details of Reserves, Net of Taxes (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureReservesDetailsOfReservesNetOfTaxes
2191 Implied Table Table

*

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 implied:Table
2192 Disclosure of reserves within equity [abstract] Abstract ifrs-full:DisclosureOfReservesWithinEquityAbstract
2193 Valuation gain on FVOCI Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
2194 Valuation gain on available-for-sale financial assets Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssets
2195 Other comprehensive loss of investments in associates Concept (Monetary) As Of Credit skm:OtherComprehensiveIncomeLossOfInvestmentsInAssociates
2196 Valuation loss on derivatives Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedges
2197 Foreign currency translation differences for foreign operations Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
2198 Total reserves, net of taxes Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2199 1182 - Disclosure - Reserves - Changes in Reserves (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureReservesChangesInReserves
2200 Disclosure of reserves within equity [Table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
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2202 Reserves [member] Member ifrs-full:OtherReservesMember
2203 Valuation gain (loss) on financial assets at FVOCI [member] Member ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
2204 Valuation gain (loss) on available-for-sale financial assets [Member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
2205 Other comprehensive loss of investments in associates [Member] Member skm:OtherComprehensiveIncomeLossOfInvestmentsInAssociatesMember
2206 Valuation gain (loss) on derivatives [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
2207 Foreign currency translation differences for foreign operations [Member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
2208 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
2209 Currently stated [member] Member ifrs-full:RestatedMember
2210 Increase (decrease) due to application of IFRS 15 [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
2211 Restated balance [member] Member skm:RestatedBalanceMember
2212 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2213 Balance at January 1 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2214 Changes, net of taxes Concept (Monetary) For Period Credit ifrs-full:ChangesInEquity
2215 Balance at December 31 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2216 1183 - Disclosure - Reserves - Changes in Valuation Gain on Financial Assets at FVOCI and Available-for-sale Financial Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureReservesChangesInValuationGainOnFinancialAssetsAtFVOCIAndAvailableforsaleFinancialAssets
2217 Disclosure of reserves within equity [Table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2218 Reserves within equity [Axis] Axis ifrs-full:ReservesWithinEquityAxis
2219 Reserves [member] Member ifrs-full:OtherReservesMember
2220 Valuation gain (loss) on available-for-sale financial assets [Member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
2221 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2222 Balance at January 1 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2223 Amount recognized as other comprehensive income during the year, net of taxes Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
2224 Amount reclassified to profit or loss, net of taxes Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsNetOfTax
2225 Amount reclassified to retained earnings, net of taxes Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax
2226 Balance at December 31 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2227 1184 - Disclosure - Reserves - Changes in Valuation Gain (Loss) on Derivatives (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureReservesChangesInValuationGainLossOnDerivatives
2228 Disclosure of reserves within equity [Table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
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2231 Valuation gain (loss) on derivatives [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
2232 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2233 Balance at January 1 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2234 Amount recognized as other comprehensive loss during the year, net of taxes Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
2235 Amount reclassified to profit or loss, net of taxes Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax
2236 Balance at December 31 Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2237 1185 - Disclosure - Redeemable Convertible Preferred Stocks - Summary of Redeemable Convertible Preferred Stocks (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureRedeemableConvertiblePreferredStocksSummaryOfRedeemableConvertiblePreferredStocks
2238 Implied Table Table

*

*

 implied:Table
2239 Redeemable Convertible Preferred Stocks [abstract] Abstract skm:RedeemableConvertiblePreferredStocksAbstract
2240 Issuer Concept (Text/String) For Period skm:NameOfIssuer
2241 Number of shares issued Concept (Shares) For Period skm:NumberOfSharesIssuedConversionOfDebt
2242 Issue price Concept (Share) For Period skm:ConversionOfDebtToEquityIssuePrice
2243 Voting rights Concept (Text/String) For Period skm:ConversionOfDebtToEquityVotingRights
2244 Dividend rate Concept (Text/String) For Period skm:ConversionOfDebtToEquityDividendRate
2245 Conversion period Concept (Text/String) For Period ifrs-full:DescriptionOfConversionOfDebtToEquity
2246 Conversion ratio Concept (Text/String) For Period skm:ConversionOfDebtToEquityConversionRatio
2247 Conversion price Concept (Share) For Period skm:ConversionOfDebtToEquityConversionPrice
2248 Refixing clauses Concept (Text/String) For Period skm:ConversionOfDebtToEquityRefixingClauses
2249 Redemption period Concept (Text/String) For Period skm:ConversionOfDebtToEquityRedemptionPeriod
2250 Redemption party Concept (Text/String) For Period skm:ConversionOfDebtToEquityRedemptionParty
2251 Redemption price Concept (Text/String) For Period skm:ConversionOfDebtToEquityRedemptionPrice
2252 Claim to the residue Concept (Text/String) For Period skm:ConversionOfDebtToEquityClaimResidue
2253 1186 - Disclosure - Redeemable Convertible Preferred Stocks - Summary of Redeemable Convertible Preferred Stocks (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureRedeemableConvertiblePreferredStocksSummaryOfRedeemableConvertiblePreferredStocksParenthetical
2254 Redeemable Convertible Preferred Stocks [table] Table

*

*

 skm:RedeemableConvertiblePreferredStocksTable
2255 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
2256 Equity [member] Member ifrs-full:EquityMember
2257 Non-controlling interests [member] Member ifrs-full:NoncontrollingInterestsMember
2258 Redeemable Convertible Preferred Stocks [line items] LineItems skm:RedeemableConvertiblePreferredStocksLineItems
2259 Dividend payable Concept (Monetary) As Of Credit ifrs-full:CurrentDividendPayables
2260 1187 - Disclosure - Other Operating Income and Expenses - Details of Other Operating Income and Expenses (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureOtherOperatingIncomeAndExpensesDetailsOfOtherOperatingIncomeAndExpenses
2261 Implied Table Table

*

*

 implied:Table
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2264 Gain on disposal of property and equipment and intangible assets Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfNoncurrentAssets
2265 Others Concept (Monetary) For Period Credit ifrs-full:MiscellaneousOtherOperatingIncome
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2268 Communication Concept (Monetary) For Period Debit ifrs-full:CommunicationExpense
2269 Utilities Concept (Monetary) For Period Debit ifrs-full:UtilitiesExpense
2270 Taxes and dues Concept (Monetary) For Period Debit ifrs-full:TaxExpenseOtherThanIncomeTaxExpense
2271 Repair Concept (Monetary) For Period Debit ifrs-full:RepairsAndMaintenanceExpense
2272 Research and development Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
2273 Training Concept (Monetary) For Period Debit skm:TrainingExpense
2274 Bad debt for accounts receivable - trade Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables
2275 Travel Concept (Monetary) For Period Debit ifrs-full:TravelExpense
2276 Supplies and other Concept (Monetary) For Period Debit skm:SuppliesAndOtherExpense
2277 Loss on disposal of property and equipment and intangible assets Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
2278 Impairment loss on other investment securities Concept (Monetary) For Period Debit skm:ImpairmentLossRecognisedInProfitOrLossOtherInvestmentSecurities
2279 Impairment loss on property and equipment and intangible assets Concept (Monetary) For Period Debit skm:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentAndIntangibleAssets
2280 Donations Concept (Monetary) For Period Debit ifrs-full:DonationsAndSubsidiesExpense
2281 Bad debt for accounts receivable - other Concept (Monetary) For Period Debit skm:BadDebtForAccountsReceivableOther
2282 Others Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
2283 Other operating expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
2284 1188 - Disclosure - Finance Income and Costs - Details of Finance Income and Costs (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsDetailsOfFinanceIncomeAndCosts
2285 Implied Table Table

*

*

 implied:Table
2286 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
2287 Finance Income: Abstract skm:FinanceIncomeAbstract
2288 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2289 Gain on sale of accounts receivable - other Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnLoansAndReceivables
2290 Dividends Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
2291 Gain on foreign currency transactions Concept (Monetary) For Period Credit skm:GainsOnForeignCurrencyTranslation
2292 Gain on foreign currency translations Concept (Monetary) For Period Credit ifrs-full:NetForeignExchangeGain
2293 Gain on disposal of long-term investment securities Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
2294 Gain on valuation of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsOnChangeInFairValueOfDerivatives
2295 Gain on settlement of derivatives Concept (Monetary) For Period Credit skm:GainOnSettlementOfDerivatives
2296 Gain relating to financial assets at FVTPL Concept (Monetary) For Period Credit skm:GainsOnFinancialAssetsAtFairValueThroughProfitOrLoss
2297 Reversal of impairment loss on available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLoss
2298 Gain relating to financial liability at fair value through profit or loss Concept (Monetary) For Period Credit skm:GainsOnFinancialLiabilitiesAtFairValueThroughProfitOrLoss
2299 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
2300 Finance Costs: Abstract skm:FinancialExpenseAbstract
2301 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2302 Loss on sale of accounts receivable - trade Concept (Monetary) For Period Credit skm:LossOnSaleOfAccountsAndTradeReceivable
2303 Loss on foreign currency transactions Concept (Monetary) For Period Debit skm:LossesOnForeignCurrencyTranslation
2304 Loss on foreign currency translations Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
2305 Loss on disposal of long-term investment securities Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfInvestments
2306 Loss on settlement of derivatives Concept (Monetary) For Period Debit skm:LossesOnSettlementOfDerivatives
2307 Loss relating to financial liability at FVTPL Concept (Monetary) For Period Debit skm:LossesOnFinancialLiabilitiesAtFairValueThroughProfitOrLoss
2308 Loss relating to financial assets at FVTPL Concept (Monetary) For Period Debit skm:LossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
2309 Impairment loss on long-term investment securities Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossInvestmentProperty
2310 Other finance costs Concept (Monetary) For Period Debit ifrs-full:OtherFinanceCost
2311 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
2312 1189 - Disclosure - Finance Income and Costs - Details of Finance Income and Costs (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsDetailsOfFinanceIncomeAndCostsParenthetical
2313 Implied Table Table

*

*

 implied:Table
2314 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
2315 Gain on disposal of shares of convertible redeemable bonds Concept (Monetary) For Period Credit skm:GainOnDisposalOfSharesOfConvertibleRedeemableBonds
2316 Disposal of shares of convertible redeemable bonds Concept (Shares) As Of skm:SharesOfConvertibleRedeemableBondsDisposed
2317 1190 - Disclosure - Finance Income and Costs - Details of Interest Income Included in Finance Income (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsDetailsOfInterestIncomeIncludedInFinanceIncome
2318 Implied Table Table

*

*

 implied:Table
2319 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
2320 Interest income on cash equivalents and short-term financial instruments Concept (Monetary) For Period Credit skm:InterestIncomeOnCashEquivalentsAndShorttermFinancialInstruments
2321 Interest income on installment receivables and others Concept (Monetary) For Period Credit skm:InterestIncomeOnInstallmentReceivablesAndOthers
2322 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2323 1191 - Disclosure - Finance Income and Costs - Details of Interest Expenses Included in Finance Income (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsDetailsOfInterestExpensesIncludedInFinanceIncome
2324 Implied Table Table

*

*

 implied:Table
2325 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
2326 Interest expense on borrowings Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBorrowings
2327 Interest expense on debentures Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBonds
2328 Others Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
2329 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2330 1192 - Disclosure - Finance Income and Costs - Finance Income and Costs by Category of Financial Instruments (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsFinanceIncomeAndCostsByCategoryOfFinancialInstruments
2331 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2332 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2333 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2334 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
2335 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
2336 Financial instruments [member] Member skm:FinancialInstrumentsMember
2337 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
2338 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2339 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
2340 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
2341 Financial liabilities at amortised cost [Member] Member ifrs-full:FinancialLiabilitiesAtAmortisedCostMember
2342 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2343 Financial assets at FVOCI [member] Member skm:FinancialAssetsAtFVOCIMember
2344 Financial assets at amortised cost, class [member] Member ifrs-full:FinancialAssetsAtAmortisedCostMember
2345 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2346 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
2347 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
2348 Financial assets at FVOCI Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
2349 Available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets
2350 Derivatives designated as hedging instrument Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
2351 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
2352 1193 - Disclosure - Finance Income and Costs - Details of Impairment Losses for Financial Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinanceIncomeAndCostsDetailsOfImpairmentLossesForFinancialAssets
2353 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2354 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2355 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2356 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2357 Accounts receivable - trade [member] Member ifrs-full:TradeReceivablesMember
2358 Other receivables [member] Member skm:OtherReceivablesMember
2359 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2360 Impairment losses for financial assets Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossOnFinancialAssets
2361 1194 - Disclosure - Income Tax Expense - Summary of Income Tax Expenses (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseSummaryOfIncomeTaxExpenses
2362 Implied Table Table

*

*

 implied:Table
2363 Major components of tax expense (income) [abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
2364 Current tax expense Abstract ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract
2365 Current year Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
2366 Current tax of prior years Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
2367 Current tax expense Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods
2368 Deferred tax expense Abstract ifrs-full:DeferredTaxExpenseIncomeAbstract
2369 Changes in net deferred tax assets Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
2370 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2371 1195 - Disclosure - Income Tax Expense - Difference Between Income Taxes Computed using the Statutory Corporate Income Tax Rates and the Recorded Income Taxes (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseDifferenceBetweenIncomeTaxesComputedUsingTheStatutoryCorporateIncomeTaxRatesAndTheRecordedIncomeTaxes
2372 Implied Table Table

*

*

 implied:Table
2373 Reconciliation of average effective tax rate and applicable tax rate [abstract] Abstract ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
2374 Income taxes at statutory income tax rate Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
2375 Non-taxable income Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
2376 Non-deductible expenses Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
2377 Tax credit and tax reduction Concept (Monetary) For Period Credit skm:TaxEffectOfTaxCreditAndTaxReduction
2378 Changes in unrecognized deferred taxes Concept (Monetary) For Period Debit skm:TaxEffectOfChangesInUnrecognizedDeferredTaxes
2379 Changes in tax rate Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
2380 Income tax refund etc. Concept (Monetary) For Period Debit skm:IncomeTaxPaidOrRefund
2381 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2382 1196 - Disclosure - Income Tax Expense - Deferred Taxes Directly Charged to (Credited from) Equity (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseDeferredTaxesDirectlyChargedToCreditedFromEquity
2383 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
2384 Components of equity [Axis] Axis ifrs-full:ComponentsOfEquityAxis
2385 Equity [member] Member ifrs-full:EquityMember
2386 Valuation gain (loss) on financial assets at FVOCI [member] Member ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
2387 Valuation gain (loss) on available-for-sale financial assets [Member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
2388 Share of other comprehensive income (loss) of associates [Member] Member skm:ShareOfOtherComprehensiveIncomeLossOfAssociatesAndJointVenturesAccountedForEquityMethodMember
2389 Valuation gain (loss) on derivatives [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
2390 Reserve of remeasurements of defined benefit plans [Member] Member ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlansMember
2391 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
2392 Deferred taxes directly charged to (credited from) equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
2393 1197 - Disclosure - Income Tax Expense - Details of the Changes in Deferred Tax Assets (Liabilities) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseDetailsOfTheChangesInDeferredTaxAssetsLiabilities
2394 Disclosure of temporary difference, unused tax losses and unused tax credits [Table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
2395 Temporary difference, unused tax losses and unused tax credits [Axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
2396 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2397 Loss allowance [member] Member skm:LossAllowanceMember
2398 Accrued interest income [Member] Member skm:AccruedInterestIncomeMember
2399 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2400 Financial assets measured at fair value [member] Member skm:FinancialAssetsMeasuredAtFairValueMember
2401 Investments in subsidiaries, associates and joint ventures [Member] Member skm:InvestmentsInSubsidiariesAssociatesAndJointVenturesMember
2402 Property equipment and intangible assets [member] Member skm:PropertyEquipmentAndIntangibleAssetsMember
2403 Provisions [Member] Member ifrs-full:OtherProvisionsMember
2404 Retirement benefit obligation [Member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
2405 Valuation gain (loss) on derivatives [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
2406 Foreign currency translation differences for foreign operations [Member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
2407 Reserve for research and manpower development [Member] Member skm:ResearchAndDevelopmentMember
2408 Incremental costs to acquire contract [member] Member skm:IncrementalCostsToAcquireContractMember
2409 Contract assets and liabilities [member] Member skm:ContractAssetsAndLiabilitiesMember
2410 Others [Member] Member ifrs-full:OtherTemporaryDifferencesMember
2411 Temporary differences [Member] Member ifrs-full:TemporaryDifferenceMember
2412 Deferred tax assets related to unused tax loss carryforwards and tax credit carryforwards [Member] Member skm:DeferredTaxAssetsRelatedToUnusedTaxLossCarryforwardsAndTaxCreditCarryforwardsMember
2413 Tax loss carryforwards [Member] Member ifrs-full:UnusedTaxLossesMember
2414 Unused tax credits [member] Member ifrs-full:UnusedTaxCreditsMember
2415 Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
2416 Beginning Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
2417 Changes in Accounting Policies Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeRelatingToChangesInAccountingPoliciesAndErrorsIncludedInProfitOrLoss
2418 Deferred tax expense (income) Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
2419 Directly charged to (credited from) equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
2420 Business combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
2421 Others Concept (Monetary) For Period Debit skm:DeferredTaxAssetsChangeInOtherAssets
2422 Ending Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
2423 1198 - Disclosure - Income Tax Expense - Details of Temporary Differences, Unused Tax Loss Carryforwards and Unused Tax Credits Carryforwards Which are Not Recognized as Deferred Tax Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseDetailsOfTemporaryDifferencesUnusedTaxLossCarryforwardsAndUnusedTaxCreditsCarryforwardsWhichAreNotRecognizedAsDeferredTaxAssets
2424 Disclosure of temporary difference, unused tax losses and unused tax credits [Table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
2425 Temporary difference, unused tax losses and unused tax credits [Axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
2426 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2427 Loss allowance [Member] Member ifrs-full:AllowanceForCreditLossesMember
2428 Investments in subsidiaries, associates and joint ventures [Member] Member skm:InvestmentsInSubsidiariesAssociatesAndJointVenturesMember
2429 Others [Member] Member ifrs-full:OtherTemporaryDifferencesMember
2430 Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
2431 Temporary differences Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
2432 Unused tax loss carryforwards Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
2433 Unused tax credit carryforwards Concept (Monetary) As Of ifrs-full:UnusedTaxCreditsForWhichNoDeferredTaxAssetRecognised
2434 1199 - Disclosure - Income Tax Expense - Unused Tax Loss Carryforwards and Unused Tax Credit Carryforwards Which are Not Recognized as Deferred Tax Assets (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureIncomeTaxExpenseUnusedTaxLossCarryforwardsAndUnusedTaxCreditCarryforwardsWhichAreNotRecognizedAsDeferredTaxAssets
2435 Disclosure of temporary difference, unused tax losses and unused tax credits [Table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
2436 Maturity [axis] Axis ifrs-full:MaturityAxis
2437 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2438 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
2439 1 ~ 2 years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
2440 2 ~ 3 years [Member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
2441 More than 3 years [Member] Member ifrs-full:LaterThanThreeYearsMember
2442 Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
2443 Unused tax loss carryforwards Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
2444 Unused tax credit carryforwards Concept (Monetary) As Of ifrs-full:UnusedTaxCreditsForWhichNoDeferredTaxAssetRecognised
2445 1200 - Disclosure - Earnings per Share - Summary of Basic Earnings Per Share (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureEarningsPerShareSummaryOfBasicEarningsPerShare
2446 Implied Table Table

*

*

 implied:Table
2447 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
2448 Basic earnings per share attributable to owners of the Parent Company: Abstract ifrs-full:BasicEarningsPerShareAbstract
2449 Profit attributable to owners of the Parent Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2450 Interest on hybrid bonds Concept (Monetary) For Period Debit skm:InterestOnHybridBonds
2451 Profit attributable to owners of the Parent Company on common shares Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
2452 Weighted average number of common shares outstanding Concept (Shares) For Period ifrs-full:WeightedAverageShares
2453 Basic earnings per share (in won) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
2454 1201 - Disclosure - Earnings per Share - Weighted Average Number of Common Shares Outstanding (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureEarningsPerShareWeightedAverageNumberOfCommonSharesOutstanding
2455 Earnings per Share [Table] Table

*

*

 ifrs-full:EarningsPerShareTable
2456 Shares Issued Or Purchased By Type [axis] Axis skm:SharesIssuedOrPurchasedByTypeAxis
2457 Shares Issued Or Purchased By Type [domain] Member skm:SharesIssuedOrPurchasedByTypeDomain
2458 Issued Shares [Member] Member skm:IssuedSharesMember
2459 Disposals Of Treasury Shares [member] Member skm:DisposalsOfTreasurySharesMember
2460 Earnings per Share [Line Items] LineItems ifrs-full:EarningsPerShareLineItems
2461 Issued shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
2462 Treasury shares Concept (Shares) As Of skm:NumberOfTreasuryShares
2463 Treasury shares at January 1 Concept (Shares) For Period skm:TreasurySharesEffectOnWeightedAverageSharesOutstanding
2464 Number of common shares outstanding Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2465 Weights Concept (Text/String) For Period skm:Weights
2466 Weighted average number of common shares Concept (Shares) For Period ifrs-full:WeightedAverageShares
2467 1202 - Disclosure - Earnings per Share - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureEarningsPerShareAdditionalInformation
2468 Implied Table Table

*

*

 implied:Table
2469 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
2470 Potentially dilutive shares Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
2471 1203 - Disclosure - Dividends - Details of Dividend Declared (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureDividendsDetailsOfDividendDeclared
2472 Disclosure of dividends [Table] Table

*

*

 skm:DisclosureOfDividendsTable
2473 Range [axis] Axis ifrs-full:RangeAxis
2474 Ranges [member] Member ifrs-full:RangesMember
2475 Interim [Member] Member skm:InterimMember
2476 Year-end [Member] Member skm:YearendMember
2477 Disclosure of dividends [Line Items] LineItems skm:DisclosureOfDividendsLineItems
2478 Dividend type Concept (Text/String) For Period skm:DividendTypeDescription
2479 Number of shares outstanding Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2480 Face value (in won) Concept (Share) As Of ifrs-full:ParValuePerShare
2481 Dividend ratio Concept (Percent) For Period skm:DividendPayoutRatio
2482 Dividends Concept (Monetary) As Of Credit ifrs-full:DividendPayables
2483 1204 - Disclosure - Dividends - Dividends Yield Ratios (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureDividendsDividendsYieldRatios
2484 Implied Table Table

*

*

 implied:Table
2485 Disclosure of Dividends [abstract] Abstract skm:DisclosureOfDividendsAbstract
2486 Dividend type Concept (Text/String) For Period skm:DividendTypeDescription
2487 Dividend per share Concept (Share) For Period ifrs-full:DividendsPaidOrdinarySharesPerShare
2488 Closing price at year-end Concept (Share) As Of skm:StockPricePerShare
2489 Dividend yield ratio Concept (Percent) For Period skm:DividendAnnualYieldPercentage
2490 1205 - Disclosure - Categories of Financial Instruments - Financial Assets by Category (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureCategoriesOfFinancialInstrumentsFinancialAssetsByCategory
2491 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
2492 Categories of financial assets [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2493 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2494 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
2495 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2496 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
2497 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2498 Equity instruments at FVOCI [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
2499 Debt instruments at FVOCI [member] Member ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember
2500 Financial assets at amortised cost [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
2501 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
2502 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
2503 Financial instruments Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
2504 Short-term investment securities Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
2505 Long-term investment securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
2506 Accounts receivable - trade Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
2507 Loans and other receivables Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
2508 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
2509 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
2510 Assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
2511 1206 - Disclosure - Categories of Financial Instruments - Financial Assets by Category (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureCategoriesOfFinancialInstrumentsFinancialAssetsByCategoryParenthetical
2512 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
2513 Categories of financial assets [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2514 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2515 Equity instruments at FVOCI [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
2516 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
2517 Long-term investment securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
2518 1207 - Disclosure - Categories of Financial Instruments - Financial Liabilities by Category (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureCategoriesOfFinancialInstrumentsFinancialLiabilitiesByCategory
2519 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
2520 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
2521 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
2522 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
2523 Financial liabilities measured at amortized cost [Member] Member ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
2524 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2525 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
2526 Accounts payable - trade Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
2527 Derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
2528 Borrowings Concept (Monetary) As Of Credit skm:ShorttermAndLongtermBorrowings
2529 Debentures Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
2530 Accounts payable - other and others Concept (Monetary) As Of Credit skm:AccountsPayableOtherAndOthers
2531 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
2532 1208 - Disclosure - Financial Risk Management - Monetary Assets and Liabilities Denominated in Foreign Currencies (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementMonetaryAssetsAndLiabilitiesDenominatedInForeignCurrencies
2533 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2534 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
2535 Risks [member] Member ifrs-full:TypesOfRisksMember
2536 Currency risk [member] Member ifrs-full:CurrencyRiskMember
2537 Currency [Axis] Axis srt:CurrencyAxis
2538 All Currencies [Domain] Member currency:AllCurrenciesDomain
2539 US Dollar [member] Member currency:USD
2540 Euro [member] Member currency:EUR
2541 Yen [member] Member currency:JPY
2542 Other currencies [member] Member skm:OtherCurrenciesMember
2543 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2544 Monetary assets denominated in foreign currencies Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
2545 Monetary liabilities denominated in foreign currencies Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
2546 1209 - Disclosure - Financial Risk Management - Impact on Income Before Income Tax of a Hypothetical Change in Exchange Rates (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementImpactOnIncomeBeforeIncomeTaxOfAHypotheticalChangeInExchangeRates
2547 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2548 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
2549 Risks [member] Member ifrs-full:TypesOfRisksMember
2550 Currency risk [member] Member ifrs-full:CurrencyRiskMember
2551 Currency [Axis] Axis srt:CurrencyAxis
2552 All Currencies [Domain] Member currency:AllCurrenciesDomain
2553 US Dollar [member] Member currency:USD
2554 Euro [member] Member currency:EUR
2555 Yen [member] Member currency:JPY
2556 Other currencies [member] Member skm:OtherCurrenciesMember
2557 Range [axis] Axis ifrs-full:RangeAxis
2558 Ranges [member] Member ifrs-full:RangesMember
2559 If increased by 10% [member] Member skm:HypotheticalIncreaseDueToChangeInExchangeRatesMember
2560 If decreased by 10% [member] Member skm:HypotheticalDecreaseDueToChangeInExchangeRatesMember
2561 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2562 Hypothetical increase (reduce) the Group's income before income tax Concept (Monetary) As Of ifrs-full:RiskExposureAssociatedWithInstrumentsSharingCharacteristic
2563 1210 - Disclosure - Financial Risk Management - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementAdditionalInformation
2564 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2565 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2566 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2567 Financial instruments [member] Member skm:FinancialInstrumentsMember
2568 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2569 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
2570 Cash and cash equivalents [Member] Member skm:FinancialAssetsCashAndCashEquivalentsMember
2571 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
2572 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
2573 Floating-rate [member] Member ifrs-full:FloatingInterestRateMember
2574 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
2575 Range [axis] Axis ifrs-full:RangeAxis
2576 Ranges [member] Member ifrs-full:RangesMember
2577 One Percentage Increase Decrease In Interest Rates [member] Member skm:OnePercentageIncreaseDecreaseInInterestRatesMember
2578 Statement scenario [axis] Axis skm:StatementScenarioAxis
2579 Statement scenario [member] Member skm:StatementScenarioMember
2580 Scenario Forecast1 [member] Member skm:ScenarioForecast1Member
2581 Measurement [axis] Axis ifrs-full:MeasurementAxis
2582 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
2583 At cost [member] Member ifrs-full:AtCostMember
2584 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
2585 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
2586 Long-term payables - other [member] Member skm:LongtermPayablesOtherMember
2587 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2588 Long-term borrowings Concept (Monetary) As Of Credit ifrs-full:LoansReceived
2589 Bonds Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
2590 Hypothetical increase (decrease) in interest rate, effect on income before income taxes Concept (Monetary) As Of ifrs-full:RiskExposureAssociatedWithInstrumentsSharingCharacteristic
2591 Hypothetical increase (decrease) in interest rate Concept (Percent) As Of skm:RiskExposureAssociatedWithInstrumentsSharingCharacteristicPercentageChangeInRisk
2592 Long-term payables - other Concept (Monetary) As Of Credit skm:LongtermPayablesOther
2593 Maximum credit exposure Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
2594 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
2595 1211 - Disclosure - Financial Risk Management - Maximum Credit Exposure (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementMaximumCreditExposure
2596 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
2597 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2598 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2599 Cash and cash equivalents [Member] Member skm:FinancialAssetsCashAndCashEquivalentsMember
2600 Financial instruments [member] Member skm:FinancialInstrumentsMember
2601 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2602 Accounts receivable - trade [member] Member ifrs-full:TradeReceivablesMember
2603 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
2604 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2605 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
2606 Maximum credit exposure Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
2607 1212 - Disclosure - Financial Risk Management - Summary of Gross Carrying Amounts of Each Financial Asset Except for Accounts Receivable Trade and Derivative Financial Asset (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementSummaryOfGrossCarryingAmountsOfEachFinancialAssetExceptForAccountsReceivableTradeAndDerivativeFinancialAsset
2608 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
2609 Categories of financial assets [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2610 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2611 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
2612 Financial assets at FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
2613 Financial assets at amortised cost [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
2614 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
2615 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
2616 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
2617 Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
2618 Credit impairment of financial instruments [axis] Axis ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis
2619 Credit impairment of financial instruments [member] Member ifrs-full:CreditImpairmentOfFinancialInstrumentsMember
2620 Financial instruments not credit-impaired [member] Member ifrs-full:FinancialInstrumentsNotCreditimpairedMember
2621 Financial instruments credit-impaired [member] Member ifrs-full:FinancialInstrumentsCreditimpairedMember
2622 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
2623 Gross amount Concept (Monetary) As Of Debit skm:FinancialAssetExceptForAccountsReceivableTradeAndDerivativeFinancialAssetsGross
2624 Loss allowance Concept (Monetary) As Of Credit skm:AllowanceAccountForCreditLossesOfFinancialAssetsExceptAccountsReceivableTradeAndDerivativeFinancialAssets
2625 Carrying amount Concept (Monetary) As Of Debit skm:FinancialAssetExceptForAccountsReceivableTradeAndDerivativeFinancialAssetsCarryingAmount
2626 1213 - Disclosure - Financial Risk Management - Summary of Changes in Loss Allowance for Debt Investments (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementSummaryOfChangesInLossAllowanceForDebtInvestments
2627 Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable
2628 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2629 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2630 Debt Investments [member] Member skm:DebtInvestmentsMember
2631 Credit impairment of financial instruments [axis] Axis ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis
2632 Credit impairment of financial instruments [member] Member ifrs-full:CreditImpairmentOfFinancialInstrumentsMember
2633 Financial instruments not credit-impaired [member] Member ifrs-full:FinancialInstrumentsNotCreditimpairedMember
2634 Financial instruments credit-impaired [member] Member ifrs-full:FinancialInstrumentsCreditimpairedMember
2635 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
2636 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
2637 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
2638 Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
2639 Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsLineItems
2640 Beginning balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
2641 Changes in accounting policy Concept (Monetary) For Period Debit skm:IncreaseDecreaseInFinancialAssetsDueToChangesInAccountingPolicy
2642 January 1, 2018 Concept (Monetary) For Period Debit skm:FinancialAssetsAdjustedBalance
2643 Remeasurement of loss allowance, net Concept (Monetary) For Period Credit skm:RemeasurementInAllowanceAccountForCreditLossesOfFinancialAssets
2644 Transfer to lifetime ECL - not credit impaired Concept (Monetary) For Period Debit skm:IncreaseDecreaseThroughTransfersFinancialAssetsNotImpaired
2645 Transfer to lifetime ECL - credit impaired Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets
2646 Amounts written off Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughWriteoffFinancialAssets
2647 Recovery of amounts written off Concept (Monetary) For Period ifrs-full:ReversalAllowanceAccountForCreditLossesOfFinancialAssets
2648 Business combinations Concept (Monetary) For Period Debit skm:IncreaseDecreaseThroughBusinessCombinationFinancialAssets
2649 Ending balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
2650 1214 - Disclosure - Financial Risk Management - Contractual Maturities of Financial Liabilities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementContractualMaturitiesOfFinancialLiabilities
2651 Disclosure of maturity analysis for non-derivative financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
2652 Maturity [axis] Axis ifrs-full:MaturityAxis
2653 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2654 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
2655 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
2656 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
2657 Disclosure of maturity analysis for non-derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
2658 Accounts payable - trade, carrying amount Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
2659 Borrowings, carrying amount Concept (Monetary) As Of Credit skm:ShorttermAndLongtermBorrowings
2660 Debentures, carrying amount Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
2661 Accounts payable - other and others, carrying amount Concept (Monetary) As Of Credit skm:AccountsPayableOtherAndOthers
2662 Non-derivative financial liabilities, carrying amount Concept (Monetary) As Of Credit skm:NonDerivativeFinancialLiabilities
2663 Accounts payable - trade, contractual cash flows Concept (Monetary) As Of Credit skm:AccountsPayableTradeUndiscountedCashFlows
2664 Borrowings, contractual cash flows Concept (Monetary) As Of Credit ifrs-full:BankBorrowingsUndiscountedCashFlows
2665 Debentures, contractual cash flows Concept (Monetary) As Of Credit ifrs-full:BondsIssuedUndiscountedCashFlows
2666 Accounts payable - other and others, contractual cash flows Concept (Monetary) As Of Credit skm:AccountsPayableOtherAndOthersUndiscountedCashFlows
2667 Non-derivative financial liabilities, contractual cash flows Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
2668 1215 - Disclosure - Financial Risk Management - Periods in Which Cash Flows from Cash Flow Hedge Derivatives are Expected to Occur (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementPeriodsInWhichCashFlowsFromCashFlowHedgeDerivativesAreExpectedToOccur
2669 Disclosure of maturity analysis for derivative financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable
2670 Maturity [axis] Axis ifrs-full:MaturityAxis
2671 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2672 Less than 1 year [Member] Member ifrs-full:NotLaterThanOneYearMember
2673 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
2674 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
2675 Categories of financial assets [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2676 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2677 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2678 Disclosure of maturity analysis for derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
2679 Assets, carrying amount Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
2680 Liabilities, carrying amount Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
2681 Net assets, carrying amount Concept (Monetary) As Of Debit skm:DerivativeFinancialAssetsLiabilitiesNet
2682 Assets, contractual cash flows Concept (Monetary) As Of Debit skm:DerivativeFinancialAssetsUndiscountedCashFlows
2683 Liabilities, contractual cash flows Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilitiesUndiscountedCashFlows
2684 Net assets, contractual cash flows Concept (Monetary) As Of Debit skm:DerivativeNetFinancialAssetsLiabilitiesUndiscountedCashFlows
2685 1216 - Disclosure - Financial Risk Management - Debt-equity Ratio (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementDebtequityRatio
2686 Implied Table Table

*

*

 implied:Table
2687 Disclosure of detailed information about financial instruments [abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
2688 Total Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
2689 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
2690 Debt-equity ratios Concept (Percent) For Period skm:DebtToEquityRatio
2691 1217 - Disclosure - Financial Risk - Fair Value and Carrying Amount of Financial Assets and Liabilities Including Fair Value Hierarchy (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskFairValueAndCarryingAmountOfFinancialAssetsAndLiabilitiesIncludingFairValueHierarchy
2692 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2693 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
2694 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
2695 Carrying amount [member] Member ifrs-full:AtCostWithinFairValueModelMember
2696 Level 1 [member] Member ifrs-full:Level1OfFairValueHierarchyMember
2697 Level 2 [member] Member ifrs-full:Level2OfFairValueHierarchyMember
2698 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
2699 Measurement [axis] Axis ifrs-full:MeasurementAxis
2700 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
2701 Measured at fair value [member] Member ifrs-full:AtFairValueMember
2702 Not measured at fair value [member] Member ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember
2703 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2704 FVTPL Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
2705 Borrowings Concept (Monetary) As Of Credit skm:ShorttermAndLongtermBorrowings
2706 Derivatives hedging instruments Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssetsHeldForHedging
2707 Debentures Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
2708 FVOCI Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
2709 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
2710 Long-term payables - other Concept (Monetary) As Of Credit skm:LongtermPayablesIncludingCurrentInstallmentsOther
2711 Assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
2712 FVTPL Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
2713 Derivative financial liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
2714 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
2715 1218 - Disclosure - Financial Risk Management - Interest Rates Used by the Group for the Fair Value Measurement (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementInterestRatesUsedByTheGroupForTheFairValueMeasurement
2716 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2717 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2718 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2719 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2720 Borrowings and debentures [member] Member skm:BorrowingsAndDebenturesMember
2721 Long-term payables - other [member] Member skm:LongtermPayablesOtherMember
2722 Range [axis] Axis ifrs-full:RangeAxis
2723 Ranges [member] Member ifrs-full:RangesMember
2724 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2725 Top of range [member] Member ifrs-full:TopOfRangeMember
2726 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2727 Interest rate Concept (Percent) For Period skm:InterestRateFairValueMeasurementLiabilities
2728 1219 - Disclosure - Financial Risk Management - Changes of Financial Assets Classified as Level 3 (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementChangesOfFinancialAssetsClassifiedAsLevel3
2729 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
2730 Categories of financial assets [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2731 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2732 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
2733 Available- for-sale financial assets [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2734 FVTPL [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
2735 Financial assets at FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
2736 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
2737 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
2738 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
2739 Effect of overlay approach reclassification [axis] Axis ifrs-full:EffectOfOverlayApproachReclassificationAxis
2740 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
2741 Impact of adopting IFRS 9 [member] Member skm:ImpactOfAdoptingIFRS9Member
2742 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
2743 Balance at beginning Concept (Monetary) As Of Debit ifrs-full:Assets
2744 Impact of adopting IFRS 9 Concept (Monetary) For Period ifrs-full:AmountOfReclassificationsOrChangesInPresentation
2745 Gain for the period Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets
2746 OCI Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets
2747 Acquisition Concept (Monetary) For Period Debit ifrs-full:PurchasesFairValueMeasurementAssets
2748 Disposal Concept (Monetary) For Period Credit ifrs-full:SalesFairValueMeasurementAssets
2749 Reclassification Concept (Monetary) For Period Debit skm:ReclassificationFairValueMeasurementAssets
2750 Balance at ending Concept (Monetary) As Of Debit ifrs-full:Assets
2751 1220 - Disclosure - Financial Risk Management - Changes of Financial Assets Classified as Level 3 (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementChangesOfFinancialAssetsClassifiedAsLevel3Parenthetical
2752 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
2753 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
2754 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
2755 KRAFTON Co., Ltd [member] Member skm:KraftonCoLtdMember
2756 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
2757 Number of shares acquired Concept (Shares) As Of skm:NumberOfSharesAcquired
2758 Fair value of common share Concept (Monetary) For Period Credit skm:FairValueOfCommonSharesIssued
2759 Reclassification of financial assets at FVTPL to to financial assets at FVOCI Concept (Monetary) For Period ifrs-full:ReclassificationOfFinancialAssetsOutOfMeasuredAtFairValueThroughProfitOrLossIntoMeasuredAtFairValueThroughOtherComprehensiveIncome
2760 Valuation losses on financial assets at FVOCI Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax
2761 1221 - Disclosure - Financial Risk Management - Significant Inputs for Fair Value Measurement and Inter-relationship Between Inputs and Fair Value Measured (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementSignificantInputsForFairValueMeasurementAndInterrelationshipBetweenInputsAndFairValueMeasured
2762 Disclosure of significant unobservable inputs used in fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable
2763 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
2764 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
2765 Discounted cash flow [member] Member ifrs-full:DiscountedCashFlowMember
2766 Measurement [axis] Axis ifrs-full:MeasurementAxis
2767 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
2768 Expected Cash Flows [member] Member skm:ExpectedCashFlowsMember
2769 Perpectual growth rate [member] Member skm:PerpectualGrowthRateMember
2770 Weighted average [member] Member ifrs-full:WeightedAverageMember
2771 Range [axis] Axis ifrs-full:RangeAxis
2772 Ranges [member] Member ifrs-full:RangesMember
2773 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2774 Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
2775 Valuation Techniques Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementAssets
2776 Significant non-observable inputs Concept (Text/String) For Period ifrs-full:DescriptionOfInputsUsedInFairValueMeasurementAssets
2777 Correlations between inputs and fair value measurement Concept (Text/String) For Period ifrs-full:DescriptionOfInterrelationshipsBetweenUnobservableInputsAndOfHowTheyMightMagnifyOrMitigateEffectOfChangesInUnobservableInputsOnFairValueMeasurementAssets
2778 Weighted average cost of capital Concept (Percent) For Period ifrs-full:WeightedAverageCostOfCapitalSignificantUnobservableInputsAssets
2779 1222 - Disclosure - Financial Risk Management - Significant Inputs for Fair Value Measurement and Inter-relationship Between Inputs and Fair Value Measured (Parenthetical) (Detail) Network

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*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementSignificantInputsForFairValueMeasurementAndInterrelationshipBetweenInputsAndFairValueMeasuredParenthetical
2780 Disclosure of significant unobservable inputs used in fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable
2781 Range [axis] Axis ifrs-full:RangeAxis
2782 Ranges [member] Member ifrs-full:RangesMember
2783 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2784 Top of range [member] Member ifrs-full:TopOfRangeMember
2785 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
2786 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
2787 Discounted cash flow [member] Member ifrs-full:DiscountedCashFlowMember
2788 Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
2789 Perpetual growth rate Concept (Percent) For Period skm:PerpetualGrowthRateSignificantUnobservableInputsAssets
2790 Risk free rate Concept (Percent) For Period skm:RiskFreeRateSignificantUnobservableInputsAssets
2791 Market risk premium rate Concept (Percent) For Period skm:MarketRiskPremiumRateSignificantUnobservableInputsAssets
2792 Proxy beta rate Concept (Percent) For Period skm:ProxyBetaRateSignificantUnobservableInputsAssets
2793 1223 - Disclosure - Financial Risk Management - Carrying Amount of Financial Instruments Recognized of Which Offset Agreements are Applicable (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureFinancialRiskManagementCarryingAmountOfFinancialInstrumentsRecognizedOfWhichOffsetAgreementsAreApplicable
2794 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
2795 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2796 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2797 Derivatives hedging instrument [member] Member ifrs-full:DerivativesMember
2798 Accounts payable - other and others [member] Member skm:AccountsPayableOtherAndOthersMember
2799 Accounts receivable - trade and others [member] Member skm:AccountsReceivableTradeAndOthersMember
2800 Disclosure of detailed information about financial instruments [Line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2801 Financial assets, Gross financial instruments recognized Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2802 Financial assets, Amount offset Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2803 Financial assets, Net financial instruments presented on the statements of financial position Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
2804 Financial assets, Relevant financial instruments not offset Concept (Monetary) As Of Credit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
2805 Financial assets, Net amount Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2806 Financial liabilities, Gross financial instruments recognized Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2807 Financial liabilities, Amount offset Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2808 Financial liabilities, Net financial instruments presented on the statements of financial position Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
2809 Financial liabilities, Relevant financial instruments not offset Concept (Monetary) As Of Debit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
2810 Financial liabilities, Net amount Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2811 1224 - Disclosure - Transactions with Related Parties - Compensation for the Key Management (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTransactionsWithRelatedPartiesCompensationForTheKeyManagement
2812 Implied Table Table

*

*

 implied:Table
2813 Disclosure of transactions between related parties [abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
2814 Salaries Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
2815 Defined benefits plan expenses Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
2816 Share option Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
2817 Compensation for the key management Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
2818 1225 - Disclosure - Transactions with Related Parties - Transactions with Related Parties (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTransactionsWithRelatedPartiesTransactionsWithRelatedParties
2819 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
2820 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2821 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2822 SK hynix Inc. [member] Member skm:SKhynixIncMember
2823 Other associates [Member] Member ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
2824 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
2825 F&U Credit information Co., Ltd. [Member] Member skm:FAndUCreditinformationCoLtdMember
2826 HappyNarae Co., Ltd. [member] Member skm:HappyNaraeCoLtdMember
2827 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
2828 Associates [member] Member ifrs-full:AssociatesMember
2829 SK Engineering & Construction Co., Ltd. [Member] Member skm:SKEngineeringAndConstructionCoLtdMember
2830 SK Innovation Co., Ltd. [Member] Member skm:SKInnovationCoLtdMember
2831 SK Networks Co., Ltd. [Member] Member skm:SKNetworksCoLtdMember
2832 SK Networks Services Co., Ltd. [Member] Member skm:SKNetworksServicesCoLtdMember
2833 SK Telesys Co., Ltd. [Member] Member skm:SKTelesysCoLtdMember
2834 SK TNS Co., Ltd. [Member] Member skm:SKTNSCoLtdMember
2835 SK Energy Co., Ltd. [Member] Member skm:SKEnergyCoLtdMember
2836 SK Gas Co., Ltd. [member] Member skm:SKGasCoLtdMember
2837 SKC INFRA SERVICE Co., Ltd. [Member] Member skm:SKCINFRASERVICECoLtdMember
2838 Miscellaneous other related parties [member] Member skm:MiscellaneousOtherRelatedPartiesMember
2839 Others [Member] Member ifrs-full:OtherRelatedPartiesMember
2840 SK Shipping Co., Ltd. [Member] Member skm:SKShippingCoLtdMember
2841 Ko-one energy service Co., Ltd. [Member] Member skm:KooneenergyserviceCoLtdMember
2842 SK Infosec Co., Ltd. [member] Member skm:SkInfosecCoLtdMember
2843 Disclosure of transactions between related parties [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
2844 Operating revenue and others Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGoodsRelatedPartyTransactions
2845 Operating expense and others Concept (Monetary) For Period Debit ifrs-full:PurchasesOfGoodsRelatedPartyTransactions
2846 Acquisition of property and equipment Concept (Monetary) For Period Debit ifrs-full:PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions
2847 Loans Concept (Monetary) For Period Credit ifrs-full:CashAdvancesAndLoansMadeToRelatedParties
2848 Collection of loans Concept (Monetary) For Period Debit ifrs-full:CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties
2849 1226 - Disclosure - Transactions with Related Parties - Transactions with Related Parties (Parenthetical) (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTransactionsWithRelatedPartiesTransactionsWithRelatedPartiesParenthetical
2850 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
2851 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2852 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2853 SK hynix Inc. [member] Member skm:SKhynixIncMember
2854 Other associates [Member] Member ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
2855 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
2856 Handset purchases [member] Member skm:HandsetPurchasesMember
2857 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
2858 Counterparties [member] Member ifrs-full:CounterpartiesMember
2859 Korea IT Fund and Others [member] Member skm:KoreaItFundAndOthersMember
2860 Korea IT fund [member] Member skm:KoreaITFundMember
2861 SK Innovation Co Ltd SK Energy Co Ltd SK Lubricants Co Ltd SK Trading International Co Ltd and SK Global Chemical Co Ltd [member] Member skm:SKInnovationCoLtdSKEnergyCoLtdSKLubricantsCoLtdSKTradingInternationalCoLtdAndSKGlobalChemicalCoLtdMember
2862 Disclosure of transactions between related parties [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
2863 Dividends paid Concept (Monetary) For Period Debit ifrs-full:DividendsClassifiedAsExpense
2864 Dividends received Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
2865 Dividend declared Concept (Monetary) As Of Debit skm:DividendDeclared
2866 1227 - Disclosure - Transactions with Related Parties - Account Balances with Related Parties (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureTransactionsWithRelatedPartiesAccountBalancesWithRelatedParties
2867 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
2868 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2869 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2870 Loans [member] Member skm:Loans1Member
2871 Accounts receivable - trade and others [member] Member skm:AccountsReceivableTradeAndOthersMember
2872 Accounts payable - other and others [member] Member skm:AccountsPayableOtherAndOthersMember
2873 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2874 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2875 SK Holdings Co., Ltd. [member] Member skm:SKHoldingsCoLtdMember
2876 F&U Credit information Co., Ltd. [Member] Member skm:FAndUCreditinformationCoLtdMember
2877 SK hynix Inc. [member] Member skm:SKhynixIncMember
2878 Wave City Development Co., Ltd. [member] Member skm:WaveCityDevelopmentCoLtdMember
2879 Daehan Kanggun BcN Co., Ltd. [member] Member skm:DaehanKanggunBcNCoLtdMember
2880 KEB HanaCard Co., Ltd. [member] Member skm:KEBHanaCardCoLtdMember
2881 Other associates [Member] Member ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
2882 Associates [member] Member ifrs-full:AssociatesMember
2883 SK Engineering & Construction Co., Ltd. [Member] Member skm:SKEngineeringAndConstructionCoLtdMember
2884 SK Networks Co., Ltd. [Member] Member skm:SKNetworksCoLtdMember
2885 SK Networks Services Co., Ltd. [Member] Member skm:SKNetworksServicesCoLtdMember
2886 SK Telesys Co., Ltd. [Member] Member skm:SKTelesysCoLtdMember
2887 SK TNS Co., Ltd. [Member] Member skm:SKTNSCoLtdMember
2888 SK Innovation Co., Ltd. [Member] Member skm:SKInnovationCoLtdMember
2889 SK Energy Co., Ltd. [Member] Member skm:SKEnergyCoLtdMember
2890 SK Gas Co., Ltd. [member] Member skm:SKGasCoLtdMember
2891 SK Hystec Co., Ltd. [member] Member skm:SKhystecCoLtdMember
2892 Miscellaneous other related parties [member] Member skm:MiscellaneousOtherRelatedPartiesMember
2893 Others [Member] Member ifrs-full:OtherRelatedPartiesMember
2894 HappyNarae Co., Ltd. [member] Member skm:HappyNaraeCoLtdMember
2895 S.M. Culture & Contents Co., Ltd [member] Member skm:SMCultureAndContentsCoLtdMember
2896 Xian Tianlong Science and Technology Co., Ltd. [member] Member skm:XianTianlongScienceAndTechnologyCoLtdMember
2897 Disclosure of transactions between related parties [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
2898 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
2899 Accounts payable Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
2900 1228 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation
2901 Commitments and contingencies [Table] Table

*

*

 skm:CommitmentsAndContingenciesTable
2902 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2903 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2904 SK Broadband Co., Ltd. [member] Member skm:SKBroadbandCoLtdMember
2905 Life and Security Holdings Co., Ltd. [member] Member skm:LifeAndSecurityHoldingsCoLtdMember
2906 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
2907 Provisions [Member] Member ifrs-full:OtherProvisionsMember
2908 Legal proceedings provision [member] Member ifrs-full:LegalProceedingsProvisionMember
2909 Products and services [Axis] Axis ifrs-full:ProductsAndServicesAxis
2910 Products and services [member] Member ifrs-full:ProductsAndServicesMember
2911 Sales of handsets [member] Member skm:SalesOfHandsetsMember
2912 Commitments and contingencies [Line Items] LineItems skm:CommitmentsAndContingenciesLineItems
2913 Properties pledged as collateral for leases on buildings Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentPledgedAsSecurity
2914 Short-term financial instruments as collateral for guarantees Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
2915 Shares pledged for long-term borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
2916 Provisions for legal claims and litigation Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
2917 Current provisions for legal claims and litigation Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
2918 Non-current provisions for legal claims and litigation Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
2919 Accounts receivables - other Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
2920 1229 - Disclosure - Statements of Cash Flows - Adjustments for Income and Expenses from Operating Activities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureStatementsOfCashFlowsAdjustmentsForIncomeAndExpensesFromOperatingActivities
2921 Implied Table Table

*

*

 implied:Table
2922 Adjustments to reconcile profit (loss) [abstract] Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
2923 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2924 Dividend Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
2925 Gain on foreign currency translation Concept (Monetary) For Period Credit ifrs-full:NetForeignExchangeGain
2926 Gain on disposal of long-term investment securities Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
2927 Gain on valuation of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsOnChangeInFairValueOfDerivatives
2928 Gain on settlement of derivatives Concept (Monetary) For Period Credit skm:GainOnSettlementOfDerivatives
2929 Gain relating to investments in associates and joint ventures, net Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
2930 Gain on sale of accounts receivable - other Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnLoansAndReceivables
2931 Gain on disposal of property and equipment and intangible assets Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfNoncurrentAssets
2932 Gain relating to financial assets at FVTPL Concept (Monetary) For Period Credit skm:GainsOnFinancialAssetsAtFairValueThroughProfitOrLoss
2933 Gain related to financial liabilities at FVTPL Concept (Monetary) For Period Credit skm:GainsOnFinancialLiabilitiesAtFairValueThroughProfitOrLoss
2934 Reversal of loss on impairment of available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLoss
2935 Other income Concept (Monetary) For Period Debit skm:OtherIncomeAdjustmentsForNoncashItems
2936 Interest expenses Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2937 Loss on foreign currency translation Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
2938 Loss on disposal of long-term investment securities Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfInvestments
2939 Other finance costs Concept (Monetary) For Period Debit skm:AdjustmentsForOtherFinanceCosts
2940 Loss on sale of accounts receivable - other Concept (Monetary) For Period Debit skm:LossOnSaleOfTradeAccountsReceivable
2941 Loss on settlement of derivatives Concept (Monetary) For Period Debit skm:LossesOnSettlementOfDerivatives
2942 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2943 Expense related to defined benefit plan Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
2944 Share option Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
2945 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
2946 Bad debt expense Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables
2947 Loss on disposal of property and equipment and intangible assets Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
2948 Loss on impairment of property and equipment and intangible assets Concept (Monetary) For Period Debit skm:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentAndIntangibleAssets
2949 Loss relating to financial liabilities at FVTPL Concept (Monetary) For Period Debit skm:LossesOnFinancialLiabilitiesAtFairValueThroughProfitOrLoss
2950 Loss relating to financial assets at FVTPL Concept (Monetary) For Period Debit skm:LossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
2951 Bad debt for accounts receivable - other Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9
2952 Loss on disposal of investment assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfInvestments
2953 Loss on impairment of investment assets Concept (Monetary) For Period Debit skm:ImpairmentLossRecognisedInProfitOrLossOtherInvestmentSecurities
2954 Other expenses Concept (Monetary) For Period Debit skm:OtherExpenseAdjustmentsForNoncashItems
2955 Adjustments for income and expenses from operating activities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital
2956 1230 - Disclosure - Statements of Cash Flows - Changes in Assets and Liabilities from Operating Activities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureStatementsOfCashFlowsChangesInAssetsAndLiabilitiesFromOperatingActivities
2957 Implied Table Table

*

*

 implied:Table
2958 Adjustments to reconcile profit (loss) [abstract] Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
2959 Accounts receivable - trade Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
2960 Accounts receivable - other Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInCurrentAccountsReceivableOther
2961 Accrued income Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInAccruedIncome
2962 Advance payments Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInAdvancePayments
2963 Prepaid expenses Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInPrepaidExpenses
2964 Value-Added Tax refundable Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInValueaddedTaxRefundable
2965 Inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
2966 Long-term accounts receivable - other Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInLongtermAccountsReceivableOther
2967 Guarantee deposits Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInGuaranteeDeposits
2968 Contract assets Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInContractAssets
2969 Accounts payable - trade Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable
2970 Accounts payable - other Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherOperatingPayables
2971 Advanced receipts Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInAdvanceReceipts
2972 Contract liabilities Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInContractLiabilities
2973 Withholdings Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInWithholdings
2974 Deposits received Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromCustomers
2975 Accrued expenses Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInAccruedExpenses
2976 Value-Added Tax payable Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInValueaddedTaxPayable
2977 Unearned revenue Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDeferredIncome
2978 Provisions Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInOtherCurrentProvisions
2979 Long-term provisions Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInOtherLongtermProvisions
2980 Plan assets Concept (Monetary) For Period Debit skm:AdjustmentsForDecreaseIncreaseInPlanAssets
2981 Retirement benefit payment Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities
2982 Others Concept (Monetary) For Period Debit skm:AdjustmentsForIncreaseDecreaseInOtherAssetsAndLiabilities
2983 Changes in assets and liabilities from operating activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
2984 1231 - Disclosure - Statements of Cash Flows - Significant Non-cash Transactions (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureStatementsOfCashFlowsSignificantNoncashTransactions
2985 Implied Table Table

*

*

 implied:Table
2986 Significant Non-cash Investing and Financing Transactions [abstract] Abstract skm:SignificantNoncashInvestingAndFinancingTransactionsAbstract
2987 Increase in accounts payable - other relating to acquisition of property and equipment and intangible assets Concept (Monetary) For Period Debit skm:NoncashTransactionsIncreaseDecreaseOfAccountsPayableOtherRelatedToAcquisitionOfPropertyAndEquipmentAndIntangibleAssets
2988 Investment in subsidiary from comprehensive stock exchange Concept (Monetary) For Period Debit skm:NoncashTransactionsOfInvestmentInSubsidiaryFromComprehensiveStockExchange
2989 1232 - Disclosure - Statements of Cash Flows - Reconciliation of Liabilities Arising from Financing Activities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureStatementsOfCashFlowsReconciliationOfLiabilitiesArisingFromFinancingActivities
2990 Disclosure of reconciliation of liabilities arising from financing activities [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
2991 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
2992 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
2993 Short-term borrowings [Member] Member ifrs-full:ShorttermBorrowingsMember
2994 Long-term borrowings [member] Member ifrs-full:LongtermBorrowingsMember
2995 Debentures [member] Member skm:DebenturesMember
2996 Long-term payables - other [member] Member skm:LongtermPayablesOtherMember
2997 Derivative financial liabilities [member] Member skm:DerivativeFinancialLiabilitiesMember
2998 Derivative financial assets [member] Member skm:DerivativeFinancialAssetsMember
2999 Disclosure of reconciliation of liabilities arising from financing activities [line items] LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
3000 Beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
3001 Cash flows Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
3002 Exchange rate changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
3003 Fair value changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInFairValuesLiabilitiesArisingFromFinancingActivities
3004 Business Combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities
3005 Other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
3006 Ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
3007 1233 - Disclosure - Reconciliation of Liabilities Arising from Financing Activities (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureReconciliationOfLiabilitiesArisingFromFinancingActivities
3008 Implied Table Table

*

*

 implied:Table
3009 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
3010 Payments of cash dividends Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
3011 Issuance of hybrid bonds Concept (Monetary) For Period Debit skm:IssuanceOfHybridBonds
3012 Repayment of hybrid bonds Concept (Monetary) For Period Credit skm:RepaymentOfHybridBonds
3013 Payments of interest on hybrid bond Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
3014 Capital increase by subsidiaries and others Concept (Monetary) For Period Credit skm:CapitalIncreaseBySubsidiariesAndOthers
3015 Transactions with non-controlling shareholders Concept (Monetary) For Period Credit skm:PaymentsFromChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControlNetAmountArisingFromTransactionsWithShareholders
3016 Cash flow from other financing activities Concept (Monetary) For Period Credit skm:CashFlowFromOtherFinancingActivities
3017 Total Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
3018 1234 - Disclosure - Cash Dividends paid to the Parent Company - Summary of Cash Dividends Received from Consolidated Subsidiaries and Associates (Detail) Network

*

*

 http://www.sktelecom.com/taxonomy/role/DisclosureCashDividendsPaidToTheParentCompanySummaryOfCashDividendsReceivedFromConsolidatedSubsidiariesAndAssociates
3019 Disclosure of dividends [Table] Table

*

*

 skm:DisclosureOfDividendsTable
3020 Categories of related parties [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3021 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3022 Subsidiaries [member] Member ifrs-full:SubsidiariesMember
3023 Associates [member] Member ifrs-full:AssociatesMember
3024 Parent [member] Member ifrs-full:ParentMember
3025 Disclosure of dividends [Line Items] LineItems skm:DisclosureOfDividendsLineItems
3026 Cash dividends received Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends

*

*