SINOPEC SHANGHAI PETROCHEMICAL CO LTD (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line	Label	Object Class	Period Type	Balance	Report ElementName
1	00090 - Document - Document and Entity Information	Network	*	*	http://www.spc-ir.com.hk/role/DocumentAndEntityInformation
2	Document Information [table]	Table	*	*	dei:DocumentInformationTable
3	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
4	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
5	H shares [member]	Member			shi:HSharesMember
6	A shares [member]	Member			shi:ASharesMember
7	Document Information [line items]	LineItems			dei:DocumentInformationLineItems
8	Document Type	Concept (Submission Type)	For Period		dei:DocumentType
9	Amendment Flag	Concept (Yes/No)	For Period		dei:AmendmentFlag
10	Document Period End Date	Concept (Date)	For Period		dei:DocumentPeriodEndDate
11	Document Fiscal Year Focus	Concept (Year)	For Period		dei:DocumentFiscalYearFocus
12	Document Fiscal Period Focus	Concept (Fiscal Period)	For Period		dei:DocumentFiscalPeriodFocus
13	Entity Registrant Name	Concept (Text/String)	For Period		dei:EntityRegistrantName
14	Entity Central Index Key	Concept (CIK Number)	For Period		dei:EntityCentralIndexKey
15	Current Fiscal Year End Date	Concept (Month/Day)	For Period		dei:CurrentFiscalYearEndDate
16	Entity Well-known Seasoned Issuer	Concept (Yes/No)	For Period		dei:EntityWellKnownSeasonedIssuer
17	Entity Current Reporting Status	Concept (Yes/No)	For Period		dei:EntityCurrentReportingStatus
18	Entity Filer Category	Concept (Filer Category)	For Period		dei:EntityFilerCategory
19	Trading Symbol	Concept (Text/String)	For Period		dei:TradingSymbol
20	Entity Emerging Growth Company	Concept (Yes/No)	For Period		dei:EntityEmergingGrowthCompany
21	Entity Shell Company	Concept (Yes/No)	For Period		dei:EntityShellCompany
22	Entity Common Stock, Shares Outstanding	Concept (Shares)	As Of		dei:EntityCommonStockSharesOutstanding
23	00100 - Statement - Consolidated Income Statement	Network	*	*	http://www.spc-ir.com.hk/role/ConsolidatedIncomeStatement
24	Implied Table	Table	*	*	implied:Table
25	Consolidated Income Statement [abstract]	Abstract			ifrs-full:StatementOfComprehensiveIncomeAbstract
26	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
27	Sales taxes and surcharges	Concept (Monetary)	For Period	Debit	ifrs-full:TaxExpenseOtherThanIncomeTaxExpense
28	Net Sales	Concept (Monetary)	For Period	Credit	shi:NetSales
29	Cost of sales	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfSales
30	Gross profit	Concept (Monetary)	For Period	Credit	ifrs-full:GrossProfit
31	Selling and administrative expenses	Concept (Monetary)	For Period	Debit	ifrs-full:SellingGeneralAndAdministrativeExpense
32	Net impairment losses on financial assets	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossOnFinancialAssets
33	Other operating income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
34	Other operating expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OtherExpenseByFunction
35	Other (losses)/gains - net	Concept (Monetary)	For Period	Credit	ifrs-full:OtherGainsLosses
36	Operating profit	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossFromOperatingActivities
37	Finance income	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncome
38	Finance expenses	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
39	Finance income - net	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncomeCost
40	Share of net profit of associates and joint ventures accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
41	Profit before income tax	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
42	Income tax expense	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
43	Profit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
44	Profit attributable to:	Abstract			ifrs-full:ProfitLossAttributableToAbstract
45	Owners of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
46	Non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToNoncontrollingInterests
47	Profit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
48	Earnings per share attributable to owners of the Company for the year (expressed in RMB per share)	Abstract			ifrs-full:BasicAndDilutedEarningsPerShareAbstract
49	Basic earnings per share	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
50	Diluted earnings per share	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
51	Earnings per ADS attributable to owners of the Company for the year (expressed in RMB per ADS)	Abstract			shi:BasicAndDilutedEarningsPerAmericanDepositaryShareAbstract
52	Basic earnings per ADS	Concept (Share)	For Period		shi:BasicEarningsLossPerAmericanDepositaryShare
53	Diluted earnings per ADS	Concept (Share)	For Period		shi:DilutedEarningsLossPerAmericanDepositaryShare
54	Profit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
55	Other comprehensive income/(loss)	Abstract			ifrs-full:OtherComprehensiveIncomeAbstract
56	Share of other comprehensive income/(loss) of associates and joint ventures accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax
57	Other comprehensive income/(loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
58	Total comprehensive income for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
59	Attributable to:	Abstract			ifrs-full:ComprehensiveIncomeAttributableToAbstract
60	Owners of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
61	Non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
62	Total comprehensive income for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
63	00200 - Statement - Consolidated Balance Sheet	Network	*	*	http://www.spc-ir.com.hk/role/ConsolidatedBalanceSheet
64	Implied Table	Table	*	*	implied:Table
65	Balance Sheets [abstract]	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
66	Assets	Abstract			ifrs-full:AssetsAbstract
67	Non-current assets	Abstract			ifrs-full:NoncurrentAssetsAbstract
68	Lease prepayments and other non-current assets	Concept (Monetary)	As Of	Debit	shi:NoncurrentLeasePrepaymentsAndOtherAssets
69	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
70	Investment properties	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
71	Construction in progress	Concept (Monetary)	As Of	Debit	ifrs-full:ConstructionInProgress
72	Investments accounted for using the equity method	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
73	Deferred income tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetDeferredTaxAssets
74	Non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
75	Current assets	Abstract			ifrs-full:CurrentAssetsAbstract
76	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:Inventories
77	Financial assets at fair value through other comprehensive income	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
78	Financial assets at fair value through profit or loss	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
79	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
80	Bills receivable	Concept (Monetary)	As Of	Debit	shi:BillsReceivables
81	Other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
82	Prepayments	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepayments
83	Amounts due from related parties	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
84	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
85	Time deposits with banks	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
86	Assets classified as held for sale	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
87	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
88	Total assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
89	Equity and liabilities	Abstract			ifrs-full:EquityAndLiabilitiesAbstract
90	Share capital	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
91	Reserves	Concept (Monetary)	As Of	Credit	shi:Reserves
92	Equity attributable to owners of the Company	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAttributableToOwnersOfParent
93	Non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:NoncontrollingInterests
94	Total equity	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
95	Liabilities	Abstract			ifrs-full:LiabilitiesAbstract
96	Non-current liabilities	Abstract			ifrs-full:NoncurrentLiabilitiesAbstract
97	Deferred income	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncomeClassifiedAsNoncurrent
98	Current liabilities	Abstract			ifrs-full:CurrentLiabilitiesAbstract
99	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
100	Financial liabilities at fair value through profit or loss	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilitiesAtFairValueThroughProfitOrLoss
101	Advance from customers	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentAdvances
102	Contract liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentContractLiabilities
103	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
104	Other payables	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentPayables
105	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
106	Income tax payable	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentTaxLiabilities
107	Current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
108	Total liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
109	Total equity and liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAndLiabilities
110	00300 - Statement - Consolidated Statement of Changes in Equity	Network	*	*	http://www.spc-ir.com.hk/role/ConsolidatedStatementOfChangesInEquity
111	Statement of changes in equity [table]	Table	*	*	ifrs-full:StatementOfChangesInEquityTable
112	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
113	Total equity [member]	Member			ifrs-full:EquityMember
114	Share capital [member]	Member			ifrs-full:IssuedCapitalMember
115	Other reserves [member]	Member			ifrs-full:OtherReservesMember
116	Retained earnings [member]	Member			ifrs-full:RetainedEarningsMember
117	Total [member]	Member			ifrs-full:EquityAttributableToOwnersOfParentMember
118	Non-controlling interests [member]	Member			ifrs-full:NoncontrollingInterestsMember
119	Statement of changes in equity [line items]	LineItems			ifrs-full:StatementOfChangesInEquityLineItems
120	Beginning Balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
121	Change in accounting policy	Concept (Monetary)	As Of	Credit	shi:CumulativeEffectOfEquityDueToChangingInAccoutingPolicy
122	Restated total equity at the beginning of 2018	Concept (Monetary)	As Of	Credit	shi:RestatementOfTotalEquity
123	Profit/(loss) for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
124	Other comprehensive income/(loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
125	Total comprehensive income for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
126	Dividends proposed and approved	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
127	Employees share option scheme	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
128	Forfeit of share option scheme	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughForfeitOfShareOptionScheme
129	Exercise of share option	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
130	Dividends paid by subsidiaries to non-controlling interests	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests
131	Utilization of safety production fund	Concept (Monetary)	For Period	Credit	shi:IncreaseDecreaseThroughUtilisationOfSafetyProductionFund
132	Transactions with non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughChangeInEquityOfSubsidiaries
133	Ending Balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
134	00400 - Statement - Consolidated Statement of Cash Flows	Network	*	*	http://www.spc-ir.com.hk/role/ConsolidatedStatementOfCashFlows
135	Implied Table	Table	*	*	implied:Table
136	Consolidated Statement of Cash Flows [abstract]	Abstract			ifrs-full:StatementOfCashFlowsAbstract
137	Cash flows from operating activities	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
138	Cash generated from operations	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperations
139	Interest paid to related parties	Concept (Monetary)	For Period	Credit	shi:InterestPaidToRelatedPartiesClassifiedAsOperatingActivities
140	Interest paid to banks	Concept (Monetary)	For Period	Credit	shi:InterestPaidToThirdPartiesClassifiedAsOperatingActivities
141	Income tax paid	Concept (Monetary)	For Period	Credit	ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
142	Net cash generated from operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
143	Cash flows from investing activities	Abstract			ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
144	Dividends received from joint ventures and associates	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities
145	Interest received from related parties	Concept (Monetary)	For Period	Debit	shi:InterestReceivedFromRelatedPartiesClassifiedAsInvestingActivities
146	Interest received from banks	Concept (Monetary)	For Period	Debit	shi:InterestReceivedFromThirdPartiesClassifiedAsInvestingActivities
147	Net proceeds from settlement of derivative financial instrument	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities
148	Net proceeds from disposal of property, plant and equipment	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
149	Net proceeds from disposal of joint ventures	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
150	Proceeds from disposal of a subsidiary	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
151	Cash received from entrusted lending	Concept (Monetary)	For Period	Debit	shi:CashReceivedFromEntrustedLendingClassifiedAsInvestingActivities
152	Cash received from six-month time deposits	Concept (Monetary)	For Period	Debit	shi:CashReceivedFromTimeDepositsClassifiedAsInvestingActivities
153	Cash payment of six-month time deposits	Concept (Monetary)	For Period	Credit	shi:CashPaymentOfTimeDepositsClassifiedAsInvestingActivities
154	Cash payment of structured deposits	Concept (Monetary)	For Period	Credit	shi:CashPaymentOfStructuredDeposits
155	Cash held by the subsidiary before disposal	Concept (Monetary)	For Period	Credit	shi:CashHeldBySubsidiaryBeforeDisposal
156	Cash payment of entrusted lending	Concept (Monetary)	For Period	Credit	shi:CashPaymentOfEntrustedLendingClassifiedAsInvestingActivities
157	Purchases of property, plant and equipment and other long-term assets from related parties	Concept (Monetary)	For Period	Credit	shi:PurchaseOfPropertyPlantAndEquipmentFromRelatedPartiesClassifiedAsInvestingActivities
158	Purchases of property, plant and equipment and other long-term assets from third parties	Concept (Monetary)	For Period	Credit	shi:PurchaseOfPropertyPlantAndEquipmentAndOtherLongTermAssetsFromThirdPartiesClassifiedAsInvestingActivities
159	Net cash used in investing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInInvestingActivities
160	Cash flows from financing activities	Abstract			ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
161	Proceeds from borrowings from related parties	Concept (Monetary)	For Period	Debit	ifrs-full:CashAdvancesAndLoansFromRelatedParties
162	Proceeds from borrowings from third parties	Concept (Monetary)	For Period	Debit	shi:ProceedsFromBorrowingsFromThirdPartiesClassifiedAsFinancingActivities
163	Proceeds from exercising share option scheme	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromExerciseOfOptions
164	Repayments of borrowings to related parties	Concept (Monetary)	For Period	Credit	ifrs-full:CashRepaymentsOfAdvancesAndLoansFromRelatedParties
165	Repayments of borrowings to third parties	Concept (Monetary)	For Period	Credit	shi:RepaymentsOfBorrowingsToThirdPartiesClassifiedAsFinancingActivities
166	Cash payment of acquisition of non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries
167	Dividends paid to the Company's shareholders	Concept (Monetary)	For Period	Credit	ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities
168	Dividends paid by subsidiaries to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities
169	Net cash used in financing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInFinancingActivities
170	Net increase in cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
171	Cash and cash equivalents at beginning of the year	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
172	Exchange gains/(losses) on cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
173	Cash and cash equivalents at end of the year	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
174	10101 - Disclosure - General Information	Network	*	*	http://www.spc-ir.com.hk/role/GeneralInformation
175	Implied Table	Table	*	*	implied:Table
176	General information [abstract]	Abstract			shi:GeneralInformationAbstract
177	General information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
178	10201 - Disclosure - Summary of Significant Accounting Policies	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPolicies
179	Implied Table	Table	*	*	implied:Table
180	Summary of significant accounting policies [abstract]	Abstract			shi:SummaryOfSignificantAccountingPoliciesAbstract
181	Summary of significant accounting policies	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
182	10301 - Disclosure - Changes in Accounting Policies	Network	*	*	http://www.spc-ir.com.hk/role/ChangesInAccountingPolicies
183	Implied Table	Table	*	*	implied:Table
184	Changes in accounting policies [abstract]	Abstract			ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsAbstract
185	Changes in accounting policies	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
186	10401 - Disclosure - Financial Risk Management	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagement
187	Implied Table	Table	*	*	implied:Table
188	Financial risk management [abstract]	Abstract			ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsAbstract
189	Financial risk management	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
190	10501 - Disclosure - Critical Accounting Estimates and Assumptions	Network	*	*	http://www.spc-ir.com.hk/role/CriticalAccountingEstimatesAndAssumptions
191	Implied Table	Table	*	*	implied:Table
192	Critical accounting estimates and assumptions [abstract]	Abstract			shi:CriticalAccountingEstimatesAndAssumptionsAbstract
193	Critical accounting estimates and assumptions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
194	10601 - Disclosure - Segment Information	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformation
195	Implied Table	Table	*	*	implied:Table
196	Segment information [abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
197	Segment information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
198	10701 - Disclosure - Other Operating Income	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingIncome
199	Implied Table	Table	*	*	implied:Table
200	Other operating income [abstract]	Abstract			shi:OtherOperatingIncomeAbstract
201	Other operating income	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherOperatingIncomeExplanatory
202	10801 - Disclosure - Other Operating Expenses	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingExpenses
203	Implied Table	Table	*	*	implied:Table
204	Other operating expenses [abstract]	Abstract			shi:OtherOperatingExpensesAbstract
205	Other operating expenses	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherOperatingExpenseExplanatory
206	10901 - Disclosure - Other (losses)/gains - net	Network	*	*	http://www.spc-ir.com.hk/role/OtherLossesGainsNet
207	Implied Table	Table	*	*	implied:Table
208	Other (losses)/gains - net [abstract]	Abstract			shi:OtherGainsLossNetAbstract
209	Other (losses)/gains - net	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherGainsLossNetExplanatory
210	11001 - Disclosure - Finance Income and Expenses	Network	*	*	http://www.spc-ir.com.hk/role/FinanceIncomeAndExpenses
211	Implied Table	Table	*	*	implied:Table
212	Finance income and expenses [abstract]	Abstract			shi:FinanceIncomeAndExpensesAbstract
213	Finance income and expenses	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
214	11101 - Disclosure - Expense by Nature	Network	*	*	http://www.spc-ir.com.hk/role/ExpenseByNature
215	Implied Table	Table	*	*	implied:Table
216	Expense by nature [abstract]	Abstract			ifrs-full:ExpenseByNatureAbstract
217	Expense by nature	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfExpensesByNatureExplanatory
218	11201 - Disclosure - Employee Benefit Expenses	Network	*	*	http://www.spc-ir.com.hk/role/EmployeeBenefitExpenses
219	Implied Table	Table	*	*	implied:Table
220	Employee benefit expenses [abstract]	Abstract			ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
221	Employee benefit expenses	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
222	11301 - Disclosure - Income Tax	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTax
223	Implied Table	Table	*	*	implied:Table
224	Income tax [abstract]	Abstract			shi:IncomeTaxAbstract
225	Income tax	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIncomeTaxExplanatory
226	11401 - Disclosure - Earnings per Share	Network	*	*	http://www.spc-ir.com.hk/role/EarningsPerShare
227	Implied Table	Table	*	*	implied:Table
228	Earnings per share [abstract]	Abstract			ifrs-full:EarningsPerShareAbstract
229	Earnings per share	Concept (Text Block (HTML))	For Period		ifrs-full:EarningsPerShareExplanatory
230	11501 - Disclosure - Lease Prepayments and Other Non-current Assets	Network	*	*	http://www.spc-ir.com.hk/role/LeasePrepaymentsAndOtherNoncurrentAssets
231	Implied Table	Table	*	*	implied:Table
232	Lease prepayments and other non-current assets [abstract]	Abstract			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsAbstract
233	Lease prepayments and other non-current assets	Concept (Text Block (HTML))	For Period		shi:DisclosureOfLeasePrepaymentsAndOtherAssetsExplanatory
234	11601 - Disclosure - Property, Plant and Equipment	Network	*	*	http://www.spc-ir.com.hk/role/PropertyPlantAndEquipment
235	Implied Table	Table	*	*	implied:Table
236	Property, plant and equipment [abstract]	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
237	Property, plant and equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
238	11701 - Disclosure - Investment Properties	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentProperties
239	Implied Table	Table	*	*	implied:Table
240	Investment properties [abstract]	Abstract			ifrs-full:DisclosureOfInvestmentPropertyAbstract
241	Investment properties	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInvestmentPropertyExplanatory
242	11801 - Disclosure - Construction in Progress	Network	*	*	http://www.spc-ir.com.hk/role/ConstructionInProgress
243	Implied Table	Table	*	*	implied:Table
244	Construction in progress [abstract]	Abstract			shi:DisclosureOfConstructionInProgressAbstract
245	Construction in progress	Concept (Text Block (HTML))	For Period		shi:ConstructionInProgressExplanatory
246	11901 - Disclosure - Subsidiaries	Network	*	*	http://www.spc-ir.com.hk/role/Subsidiaries
247	Implied Table	Table	*	*	implied:Table
248	Subsidiaries [abstract]	Abstract			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
249	Subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
250	12001 - Disclosure - Investments Accounted for Using the Equity Method	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethod
251	Implied Table	Table	*	*	implied:Table
252	Investments accounted for using the equity method [abstract]	Abstract			ifrs-full:InvestmentsAccountedForUsingEquityMethodAbstract
253	Investments accounted for using the equity method	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory
254	12101 - Disclosure - Inventories	Network	*	*	http://www.spc-ir.com.hk/role/Inventories
255	Implied Table	Table	*	*	implied:Table
256	Inventories [abstract]	Abstract			ifrs-full:ClassesOfInventoriesAbstract
257	Inventories	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInventoriesExplanatory
258	12201 - Disclosure - Financial Assets and Financial Liabilities	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilities
259	Implied Table	Table	*	*	implied:Table
260	Financial assets and financial liabilities [abstract]	Abstract			shi:DisclosureOfFinancialAssetsAndLiabilitiesAbstract
261	Financial assets and financial liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
262	12301 - Disclosure - Other assets and assets classified as held for sale	Network	*	*	http://www.spc-ir.com.hk/role/OtherAssetsAndAssetsClassifiedAsHeldForSale
263	Implied Table	Table	*	*	implied:Table
264	Other assets and assets classified as held for sale [abstract]	Abstract			ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwnersAbstract
265	Other assets and assets classified as held for sale	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
266	12401 - Disclosure - Deferred Income	Network	*	*	http://www.spc-ir.com.hk/role/DeferredIncome
267	Implied Table	Table	*	*	implied:Table
268	Deferred income [abstract]	Abstract			ifrs-full:AccrualsAndDeferredIncomeAbstract
269	Deferred income	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDeferredIncomeExplanatory
270	12501 - Disclosure - Share Capital	Network	*	*	http://www.spc-ir.com.hk/role/ShareCapital
271	Implied Table	Table	*	*	implied:Table
272	Share capital [abstract]	Abstract			ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
273	Share capital	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
274	12601 - Disclosure - Reserves	Network	*	*	http://www.spc-ir.com.hk/role/Reserves
275	Implied Table	Table	*	*	implied:Table
276	Reserves [abstract]	Abstract			ifrs-full:DisclosureOfReservesWithinEquityAbstract
277	Reserves	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
278	12701 - Disclosure - Share-Based Payments	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPayments
279	Implied Table	Table	*	*	implied:Table
280	Share-based payments [abstract]	Abstract			shi:ShareBasedPaymentArrangementsAbstract
281	Share-based payments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
282	12801 - Disclosure - Related Party Transactions	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactions
283	Implied Table	Table	*	*	implied:Table
284	Related party transactions [abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
285	Related party transactions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRelatedPartyExplanatory
286	12901 - Disclosure - Dividend	Network	*	*	http://www.spc-ir.com.hk/role/Dividend
287	Implied Table	Table	*	*	implied:Table
288	Dividend [abstract]	Abstract			shi:DividendAbstract
289	Dividend	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDividendsExplanatory
290	13001 - Disclosure - Cash Generated from Operations	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperations
291	Implied Table	Table	*	*	implied:Table
292	Cash generated from operations [abstract]	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
293	Cash generated from operations	Concept (Text Block (HTML))	For Period		shi:DisclosureOfCashGeneratedFromOperationsExplanatory
294	13101 - Disclosure - Commitments	Network	*	*	http://www.spc-ir.com.hk/role/Commitments
295	Implied Table	Table	*	*	implied:Table
296	Commitments [abstract]	Abstract			shi:CommitmentsAbstract
297	Commitments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCommitmentsExplanatory
298	13201 - Disclosure - Subsequent Event	Network	*	*	http://www.spc-ir.com.hk/role/SubsequentEvent
299	Implied Table	Table	*	*	implied:Table
300	Subsequent event [abstract]	Abstract			shi:SubsequentEventAbstract
301	Subsequent event	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
302	13301 - Disclosure - Balance Sheet and Reserve Movement of the Company	Network	*	*	http://www.spc-ir.com.hk/role/BalanceSheetAndReserveMovementOfTheCompany
303	Implied Table	Table	*	*	implied:Table
304	Balance sheet and reserve movement of the Company [abstract]	Abstract			shi:BalanceSheetAndReserveMovementOfParentCompanyAbstract
305	Balance sheet and reserve movement of the Company	Concept (Text Block (HTML))	For Period		shi:DisclosureOfFinancialInformationOfParentCompanyOnlyExplanatory
306	13401 - Disclosure - Benefits and Interests of Directors and Supervisors	Network	*	*	http://www.spc-ir.com.hk/role/BenefitsAndInterestsOfDirectorsAndSupervisors
307	Implied Table	Table	*	*	implied:Table
308	Benefits and interests of directors and Supervisors [abstract]	Abstract			shi:DisclosureOfBenefitsAndInterestsOfDirectorsAbstract
309	Benefits and interests of directors and Supervisors	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
310	20201 - Disclosure - Summary of Significant Accounting Policies (Policies)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesPolicies
311	Implied Table	Table	*	*	implied:Table
312	Summary of significant accounting policies [abstract]	Abstract			shi:SummaryOfSignificantAccountingPoliciesAbstract
313	Basis of preparation	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
314	Subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSubsidiariesExplanatory
315	Associates	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociates
316	Joint arrangements	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentsInJointVentures
317	Segment reporting	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
318	Foreign currency translation	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
319	Property, plant and equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
320	Construction in progress	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForConstructionInProgressExplanatory
321	Investment properties	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory
322	Lease prepayments and other non-current assets	Concept (Text Block (HTML))	For Period		shi:DescriptionOfAccountingPolicyForLeasePrepaymentsAndOtherAssetsExplanatory
323	Impairment of non-financial assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
324	Investments and financial assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
325	Offsetting financial instruments	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory
326	Derivative financial instruments	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory
327	Assets classified as held for sale	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
328	Inventories	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
329	Trade receivables, bills receivable and other receivables	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory
330	Cash and cash equivalents	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
331	Share capital	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
332	Safety production fund	Concept (Text Block (HTML))	For Period		shi:DescriptionOfAccountingPolicyForSafetyProductionFund
333	Trade payables and other payables	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory
334	Borrowings	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForBorrowingsExplanatory
335	Borrowing costs	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory
336	Current and deferred income tax	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
337	Employee benefits	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
338	Share-based payment	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
339	Provisions	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
340	Revenue recognition	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
341	Interest income	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInterestIncomeAndExpenseExplanatory
342	Dividend income	Concept (Text Block (HTML))	For Period		shi:DescriptionOfAccountingPolicyForDividendIncome
343	Government grants	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
344	Leases	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
345	Dividend distribution	Concept (Text Block (HTML))	For Period		shi:DescriptionOfAccountingPolicyForDividendDistribution
346	Research and development costs	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory
347	Related parties	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTransactionsWithRelatedPartiesExplanatory
348	30201 - Schedule - Summary of Significant Accounting Policies (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesTables
349	Implied Table	Table	*	*	implied:Table
350	Summary of significant accounting policies [abstract]	Abstract			shi:SummaryOfSignificantAccountingPoliciesAbstract
351	Summary of estimated useful lives of property, plant and equipment	Concept (Text Block (HTML))	For Period		shi:DisclosureOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentExplanatory
352	Summary of estimated useful lives of lease prepayments and other non-current assets	Concept (Text Block (HTML))	For Period		shi:DisclosureOfEstimatedUsefulLivesOfLeasePrepaymentsAndOtherAssets
353	30301 - Schedule - Changes in Accounting Policies (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/ChangesInAccountingPoliciesTables
354	Disclosure of initial application of standards or interpretations [table]	Table	*	*	ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable
355	Initially applied IFRSs [axis]	Axis			ifrs-full:InitiallyAppliedIFRSsAxis
356	Initially applied IFRSs [member]	Member			ifrs-full:InitiallyAppliedIFRSsMember
357	IFRS 9 [member]	Member			shi:IFRS9Member
358	IFRS 15 [member]	Member			shi:IFRS15Member
359	Disclosure of initial application of standards or interpretations [line items]	LineItems			ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
360	Impact of adoption	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfInitialApplicationOfStandardsOrInterpretations
361	30401 - Schedule - Financial Risk Management (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagementTables
362	Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable
363	Classes of financial instruments [axis]	Axis			ifrs-full:ClassesOfFinancialInstrumentsAxis
364	Financial instruments, class [member]	Member			ifrs-full:ClassesOfFinancialInstrumentsMember
365	Trade receivables (including receivables from related parties) [member]	Member			ifrs-full:TradeReceivablesMember
366	Other receivables (including receivables from related parties) [member]	Member			shi:OtherReceivablesMember
367	Debt instruments carries at FVOCI [member]	Member			ifrs-full:DebtSecuritiesMember
368	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
369	Reconciliation of loss allowance	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsExplanatory
370	Maturity analysis for financial liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfLiquidityRiskExplanatory
371	Finanical instruments at fair value	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFairValueOfFinancialInstrumentsExplanatory
372	30601 - Schedule - Segment Information (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationTables
373	Implied Table	Table	*	*	implied:Table
374	Segment information [abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
375	Segment information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOperatingSegmentsExplanatory
376	30701 - Schedule - Other Operating Income (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingIncomeTables
377	Implied Table	Table	*	*	implied:Table
378	Other operating income [abstract]	Abstract			shi:OtherOperatingIncomeAbstract
379	Other operating income	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherOperatingIncomeComponentsExplanatory
380	30801 - Schedule - Other Operating Expenses (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingExpensesTables
381	Implied Table	Table	*	*	implied:Table
382	Other operating expenses [abstract]	Abstract			shi:OtherOperatingExpensesAbstract
383	Other operating expenses	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherOperatingExpenseComponentsExplanatory
384	30901 - Schedule - Other (losses)/gains - net (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/OtherLossesgainsNetTables
385	Implied Table	Table	*	*	implied:Table
386	Other (losses)/gains - net [abstract]	Abstract			shi:OtherGainsLossNetAbstract
387	Other (losses)/gains - net	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherGainsLossNetComponentsExplanatory
388	31001 - Schedule - Finance Income and Expenses (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/FinanceIncomeAndExpensesTables
389	Implied Table	Table	*	*	implied:Table
390	Finance income and expenses [abstract]	Abstract			shi:FinanceIncomeAndExpensesAbstract
391	Finance income and expenses	Concept (Text Block (HTML))	For Period		shi:DisclosureOfFinanceIncomeAndExpensesExplanatory
392	31101 - Schedule - Expense by Nature (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/ExpenseByNatureTables
393	Implied Table	Table	*	*	implied:Table
394	Expense by nature [abstract]	Abstract			ifrs-full:ExpenseByNatureAbstract
395	Expense by nature	Concept (Text Block (HTML))	For Period		shi:DisclosureOfExpenseByNatureExplanatory
396	31201 - Schedule - Employee Benefit Expenses (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/EmployeeBenefitExpensesTables
397	Implied Table	Table	*	*	implied:Table
398	Employee benefit expenses [abstract]	Abstract			ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
399	Employee benefit expenses	Concept (Text Block (HTML))	For Period		shi:DisclosureOfEmployeeBenefitExpenseExplanatory
400	31301 - Schedule - Income Tax (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxTables
401	Implied Table	Table	*	*	implied:Table
402	Income tax [abstract]	Abstract			shi:IncomeTaxAbstract
403	Summary of major components of income tax expense	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMajorComponentsOfIncomeTaxExpenseIncomeExplanatory
404	Summary of reconciliation of expected income tax and actual income tax	Concept (Text Block (HTML))	For Period		shi:DisclosureOfExpectedIncomeTaxAndActualIncomeTaxExplanatory
405	Summary of deferred tax assets and deferred tax liabilities	Concept (Text Block (HTML))	For Period		shi:DisclosureOfDeferredTaxAssetsAndLiabilitiesExplanatory
406	Summary of movements in deferred tax assets and liabilities	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMovementsInDeferredTaxAssetsAndLiabilitiesExplanatory
407	Summary of tax losses carried forward and not recognised as deferred tax assets	Concept (Text Block (HTML))	For Period		shi:DisclosureOfTaxLossesCarriedForwardAndNotRecognisedAsDeferredTaxAssetsExplanatory
408	31401 - Schedule - Earnings per Share (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/EarningsPerShareTables
409	Implied Table	Table	*	*	implied:Table
410	Earnings per share [abstract]	Abstract			ifrs-full:EarningsPerShareAbstract
411	Summary of earnings per share, basic	Concept (Text Block (HTML))	For Period		shi:DisclosureOfEarningsPerShareBasicExplanatory
412	Summary of earnings per share, diluted	Concept (Text Block (HTML))	For Period		shi:DisclosureOfEarningsPerShareDilutedExplanatory
413	31501 - Schedule - Lease Prepayments and Other Non-current Assets (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/LeasePrepaymentsAndOtherNoncurrentAssetsTables
414	Implied Table	Table	*	*	implied:Table
415	Lease prepayments and other non-current assets [abstract]	Abstract			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsAbstract
416	Summary of lease prepayments and other non-current assets	Concept (Text Block (HTML))	For Period		shi:DisclosureOfDetailedInformationAboutLeasePrepaymentsAndOtherAssetsExplanatory
417	31601 - Schedule - Property, Plant and Equipment (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/PropertyPlantAndEquipmentTables
418	Implied Table	Table	*	*	implied:Table
419	Property, plant and equipment [abstract]	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
420	Summary of property, plant and equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
421	31701 - Schedule - Investment Properties (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentPropertiesTables
422	Implied Table	Table	*	*	implied:Table
423	Investment properties [abstract]	Abstract			ifrs-full:DisclosureOfInvestmentPropertyAbstract
424	Summary of investment properties	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutInvestmentPropertyExplanatory
425	31801 - Schedule - Construction in Progress (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/ConstructionInProgressTables
426	Implied Table	Table	*	*	implied:Table
427	Construction in progress [abstract]	Abstract			shi:DisclosureOfConstructionInProgressAbstract
428	Construction in progress	Concept (Text Block (HTML))	For Period		shi:DisclosureOfConstructionInProgressExplanatory
429	31901 - Schedule - Subsidiaries (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/SubsidiariesTables
430	Implied Table	Table	*	*	implied:Table
431	Subsidiaries [abstract]	Abstract			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
432	Summary of major subsidiaries	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMajorSubsidiariesExplanatory
433	Transaction in acquisition of Golden Phillips	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
434	32001 - Schedule - Investments Accounted for Using the Equity Method (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodTables
435	Disclosure of significant investments in associates and joint ventures [table]	Table	*	*	shi:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesTable
436	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
437	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
438	Associates [member]	Member			ifrs-full:AssociatesMember
439	Material associates [member]	Member			shi:AggregatedIndividuallyMaterialAssociatesMember
440	Other associates [member]	Member			ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
441	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
442	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
443	Joint ventures [member]	Member			ifrs-full:JointVenturesMember
444	Disclosure of significant investments in associates and joint ventures [line items]	LineItems			shi:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesLineItems
445	Summary of amounts recognized in balance sheet	Concept (Text Block (HTML))	For Period		shi:DisclosureOfInvestmentsAccountedForUsingEquityMethodRecognisedInBalanceSheetExplanatory
446	Summary of amounts recognized in share of profit of investments accounted for using the equity method	Concept (Text Block (HTML))	For Period		shi:DisclosureOfInvestmentsAccountedForUsingEquityMethodRecognisedInShareOfProfitLossExplanatory
447	Summary of investments in associates/joint ventures	Concept (Text Block (HTML))	For Period		shi:DisclosureOfInvestmentsInAssociatesAndJointVenturesExplanatory
448	Summary of principal activities of material associates/joint ventures	Concept (Text Block (HTML))	For Period		shi:DisclosureOfNatureOfInvestmentsInAssociatesAndJointVenturesExplanatory
449	Summarized financial information for associates/joint ventures	Concept (Text Block (HTML))	For Period		shi:DisclosureOfSummarisedFinancialInformationForAssociatesAndJointVenturesExplanatory
450	Reconciliation of summarized financial information for material associates	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory
451	Reconciliation of summarized financial information for joint ventures	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReconciliationOfSummarisedFinancialInformationOfJointVentureAccountedForUsingEquityMethodToCarryingAmountOfInterestInJointVentureExplanatory
452	32101 - Schedule - Inventories (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/InventoriesTables
453	Implied Table	Table	*	*	implied:Table
454	Inventories [abstract]	Abstract			ifrs-full:ClassesOfInventoriesAbstract
455	Inventories	Concept (Text Block (HTML))	For Period		shi:DisclosureOfInventoriesComponentsExplanatory
456	32201 - Schedule - Financial Assets and Financial Liabilities (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTables
457	Implied Table	Table	*	*	implied:Table
458	Financial assets and financial liabilities [abstract]	Abstract			shi:DisclosureOfFinancialAssetsAndLiabilitiesAbstract
459	Financial assets and financial liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
460	Summary of trade and other receivables	Concept (Text Block (HTML))	For Period		shi:DisclosureOfComponentOfTradeAndOtherReceivablesExplanatory
461	Summary of aging analysis in trade and other receivables	Concept (Text Block (HTML))	For Period		shi:DisclosureOfAgingAnalysisInTradeAndOtherReceivablesExplanatory
462	Summary of movements in the Group's impairment provision for trade and other receivables	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMovementsInImpairmentProvisionInTradeAndOtherReceivablesExplanatory
463	Cash and cash equivalents	Concept (Text Block (HTML))	For Period		shi:DisclosureOfCashAndCashEquivalentsComponentsExplanatory
464	Time deposits with banks	Concept (Text Block (HTML))	For Period		shi:TimeDepositsWithFinanicalInstitutionsExplanatory
465	Financial assets at fair value through other comprehensive income	Concept (Text Block (HTML))	For Period		shi:DisclosureOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeExplanatory
466	Financial assets at fair value through profit or loss	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory
467	Borrowings	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
468	Trade and other payables	Concept (Text Block (HTML))	For Period		shi:DisclosureOfTradeAndOtherPayablesExplanatory1
469	Aging analysis of trade payables (including bills payable and amounts due to related parties with trading nature)	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMaturityAnalysisOfTradePayablesExplanatory
470	32301 - Schedule - Other Assets and Assets Classified as Held for Sale (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/OtherAssetsAndAssetsClassifiedAsHeldForSaleTabels
471	Implied Table	Table	*	*	implied:Table
472	Other assets and assets classified as held for sale [abstract]	Abstract			ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwnersAbstract
473	Other assets and assets classified as held for sale	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherAssetsAndAssetsClassifiedAsHeldForSaleExplanatory
474	32401 - Schedule - Deferred Income (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/DeferredIncomeTables
475	Implied Table	Table	*	*	implied:Table
476	Deferred income [abstract]	Abstract			ifrs-full:AccrualsAndDeferredIncomeAbstract
477	Deferred income	Concept (Text Block (HTML))	For Period		shi:DisclosureOfDeferredIncomeMovementExplanatory
478	32501 - Schedule - Share Capital (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/ShareCapitalTables
479	Implied Table	Table	*	*	implied:Table
480	Share capital [abstract]	Abstract			ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
481	Share capital	Concept (Text Block (HTML))	For Period		shi:DisclosureOfShareCapitalExplanatory
482	32601 - Schedule - Reserves (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/ReservesTables
483	Implied Table	Table	*	*	implied:Table
484	Reserves [abstract]	Abstract			ifrs-full:DisclosureOfReservesWithinEquityAbstract
485	Reserves	Concept (Text Block (HTML))	For Period		shi:DisclosureOfReserveExplanatory
486	32701 - Schedule - Share-based Payments (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPaymentsTables
487	Implied Table	Table	*	*	implied:Table
488	Share-based payments [abstract]	Abstract			shi:ShareBasedPaymentArrangementsAbstract
489	Significant inputs into option pricing model	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
490	Summaries of options granted	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory
491	32801 - Schedule - Related Party Transactions (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsTables
492	Implied Table	Table	*	*	implied:Table
493	Related party transactions [abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
494	Summary of major related parties	Concept (Text Block (HTML))	For Period		shi:DisclosureOfMajorRelatedParties
495	Transactions between the Group and Sinopec Corp., its subsidiaries and joint ventures	Concept (Text Block (HTML))	For Period		shi:DisclosureOfTransactionsWithUltimateParentCompanySubsidiariesAndJointVenturesOfUltimateParentCompany
496	Other transactions between the Group and Sinopec Group and its subsidiaries, associates and joint ventures of the Group	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOtherTransactionsWithAssociatesAndJointVenturesUltimateParentCompanySubsidiariesOfUltimateParentCompany
497	The relevant amounts due from/to related parties	Concept (Text Block (HTML))	For Period		shi:DisclosureOfRelevantAmountsDueFromToRelatedParties
498	Key personnel compensations	Concept (Text Block (HTML))	For Period		shi:DisclosureOfKeyPersonnelCompensations
499	Contributions to defined contribution retirement plans	Concept (Text Block (HTML))	For Period		shi:DisclosureOfContributionsToDefinedContributionRetirementPlans
500	Commitments with related parties	Concept (Text Block (HTML))	For Period		shi:DisclosureOfCommitmentsWithRelatedParties
501	Investment commitments with related parties	Concept (Text Block (HTML))	For Period		shi:DisclosureOfInvestmentCommitmentsWithRelatedParties
502	33001 - Schedule - Cash Generated from Operations (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperationsTables
503	Implied Table	Table	*	*	implied:Table
504	Cash generated from operations [abstract]	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
505	Reconciliation of profit before taxation to cash used in operation	Concept (Text Block (HTML))	For Period		shi:DisclosureOfReconciliationOfLossesProfitBeforeIncomeTaxToCashUsedInOperationExplanatory
506	Reconciliation of liabilities arising from financing activities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
507	Proceeds from sale of property, plant and equipment	Concept (Text Block (HTML))	For Period		shi:DisclosureOfProceedsFromSaleOfPropertyPlantAndEquipmentExplanatory
508	Non-cash investing activities	Concept (Text Block (HTML))	For Period		shi:DisclosureOfNoncashInvestingActivitiesExplanatory
509	33101 - Schedule - Commitments (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/CommitmentsTables
510	Implied Table	Table	*	*	implied:Table
511	Commitments [abstract]	Abstract			shi:CommitmentsAbstract
512	Capital Commitments	Concept (Text Block (HTML))	For Period		shi:DisclosureOfCapitalCommitmentsExplanatory
513	Operating lease commitments - the Group as lessee	Concept (Text Block (HTML))	For Period		shi:DisclosureOfOperatingLeaseCommitmentsLesseeExplanatory
514	33301 - Schedule - Balance Sheet and Reserve Movement of the Company (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/BalanceSheetAndReserveMovementOfTheCompanyTables
515	Implied Table	Table	*	*	implied:Table
516	Balance sheet and reserve movement of the Company [abstract]	Abstract			shi:BalanceSheetAndReserveMovementOfParentCompanyAbstract
517	Balance sheet of the Company	Concept (Text Block (HTML))	For Period		shi:DisclosureOfBalanceSheetOfParentCompanyOnlyExplanatory
518	Reserve movement of the Company	Concept (Text Block (HTML))	For Period		shi:DisclosureOfReserveMovementOfParentCompanyOnlyExplanatory
519	33401 - Schedule - Benefits and Interests of Directors and Supervisors (Tables)	Network	*	*	http://www.spc-ir.com.hk/role/BenefitsAndInterestsOfDirectorsAndSupervisorsTables
520	Implied Table	Table	*	*	implied:Table
521	Benefits and interests of directors and Supervisors [abstract]	Abstract			shi:DisclosureOfBenefitsAndInterestsOfDirectorsAbstract
522	Directors' and supervisors' emoluments	Concept (Text Block (HTML))	For Period		shi:DisclosureOfDirectorsAndChiefExecutivesEmolumentsExplanatory
523	40101 - Disclosure - General Information (Reorganisation) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/GeneralInformationReorganisationDetails
524	General information [table]	Table	*	*	shi:GeneralInformationTable
525	Legal entity [axis]	Axis			dei:LegalEntityAxis
526	Entity [member]	Member			dei:EntityDomain
527	China Petrochemical Corporation ("Sinopec Group") [member]	Member			shi:ChinaPetrochemicalCorporationMember
528	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
529	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
530	Sinopec Shanghai Petrochemical Company Limited ("the Company") [member]	Member			ifrs-full:ParentMember
531	Shareholders of legal entity [axis]	Axis			shi:ShareholdersOfLegalEntityAxis
532	Shareholders of legal entity [member]	Member			shi:ShareholdersOfLegalEntityMember
533	China Petroleum & Chemical Corporation ("Sinopec Corp.") [member]	Member			shi:ChinaPetroleumChemicalCorporationMember
534	General information [line items]	LineItems			shi:GeneralInformationLineItems
535	State-owned legal shares transferred	Concept (Shares)	For Period		shi:StateOwnedLegalSharesTransferred
536	Percentage of issued share capital, state-owned legal shares transferred	Concept (Percent)	For Period		shi:PercentageOfIssuedShareCapitalStateOwnedLegalSharesTransferred
537	40102 - Disclosure - General Information (Share Segregation Reform Resolution) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/GeneralInformationShareSegregationReformResolutionDetails
538	General information [table]	Table	*	*	shi:GeneralInformationTable
539	Shareholders of legal entity [axis]	Axis			shi:ShareholdersOfLegalEntityAxis
540	Shareholders of legal entity [member]	Member			shi:ShareholdersOfLegalEntityMember
541	China Petroleum & Chemical Corporation ("Sinopec Corp.") [member]	Member			shi:ChinaPetroleumChemicalCorporationMember
542	Social legal person [member]	Member			shi:SocialLegalPersonMember
543	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
544	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
545	A shares [member]	Member			shi:ASharesMember
546	Non-circulating A shares [member]	Member			shi:NoncirculatingASharesMember
547	Restricted condition [axis]	Axis			shi:RestrictedConditionAxis
548	Restricted condition [member]	Member			shi:RestrictedConditionMember
549	Restricted condition one [member]	Member			shi:RestrictedConditionOneMember
550	Restricted condition two [member]	Member			shi:RestrictedConditionTwoMember
551	Restricted condition two, part one [member]	Member			shi:RestrictedConditionTwoPartOneMember
552	Restricted condition two, part two [member]	Member			shi:RestrictedConditionTwoPartTwoMember
553	Restricted condition three [member]	Member			shi:RestrictedConditionThreeMember
554	Range [axis]	Axis			ifrs-full:RangeAxis
555	Ranges [member]	Member			ifrs-full:RangesMember
556	Top of range [member]	Member			ifrs-full:TopOfRangeMember
557	General information [line items]	LineItems			shi:GeneralInformationLineItems
558	Description of shares offered by controlling shareholder	Concept (Text/String)	For Period		shi:DescriptionOfSharesOfferedByControllingShareholder
559	Aggregate shares offered by controlling shareholder	Concept (Shares)	For Period		shi:AggregateSharesOfferedByControllingShareholder
560	The circulation date	Concept (Date)	For Period		shi:CirculationDate
561	Description of restricted conditions	Concept (Text/String)	For Period		shi:DescriptionOfRestrictedConditions
562	Number of shares not allowed to be traded on SSE or transferred within restriction period	Concept (Shares)	For Period		shi:NumberOfRestrictedShares
563	Restriction period under restricted conditions	Concept (xbrli:durationItemType)	For Period		shi:RestrictionPeriod
564	Percentage of shares can be sold	Concept (Percent)	For Period		shi:PercentageOfSharesCanBeSold
565	Description of scheme of converting surplus to share capital	Concept (Text/String)	For Period		shi:DescriptionOfSchemeOfConvertingSurplusToShareCapital
566	40103 - Disclosure - General Information (The Fifteenth Meeting of the Seventh Term of Board of Directors) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/GeneralInformationTheFifteenthMeetingOfTheSeventhTermOfBoardOfDirectorsDetails
567	General information [table]	Table	*	*	shi:GeneralInformationTable
568	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
569	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
570	Tranche 1 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheOneMember
571	Tranche 2 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheTwoMember
572	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
573	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
574	Sinopec Shanghai Petrochemical Company Limited ("the Company") [member]	Member			ifrs-full:ParentMember
575	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
576	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
577	A shares [member]	Member			shi:ASharesMember
578	General information [line items]	LineItems			shi:GeneralInformationLineItems
579	Distribution plan of the resolution	Concept (Text/String)	For Period		shi:DescriptionOfStockDistributionAndCashDividendDistribution
580	Number of shares distributed	Concept (Shares)	For Period		shi:NumberOfSharesDistributed
581	Number of shares distributed, converted from share premium	Concept (Shares)	For Period		shi:NumberOfSharesDistributedConvertedFromSharePremium
582	Share premium converted to distribution shares	Concept (Monetary)	For Period	Debit	shi:SharePremiumConvertedToDistributionShares
583	Number of shares distributed, converted from surplus reserves	Concept (Shares)	For Period		shi:NumberOfSharesDistributedConvertedFromSurplusReserves
584	Surplus reserves converted to distribution shares	Concept (Monetary)	For Period	Debit	shi:SurplusReservesConvertedToDistributionShares
585	Cash payment received by the company	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromExerciseOfOptions
586	Number of grantees	Concept (Integer)	For Period		shi:ExerciseOfShareOptionNumberOfGrantees
587	Ordinary A shares registered	Concept (Shares)	For Period		shi:RegisteredShares
588	Exercise of share option	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
589	Total shares of the Company	Concept (Shares)	As Of		ifrs-full:NumberOfSharesIssued
590	40201 - Disclosure - Summary of Significant Accounting Policies (Basis of Preparation, New Standards and Interpretations Not Yet Adopted) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesBasisOfPreparationNewStandardsAndInterpretationsNotYetAdoptedDetails
591	Disclosure of expected impact of initial application of new standards or interpretations [table]	Table	*	*	ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
592	New IFRSs [axis]	Axis			ifrs-full:NewIFRSsAxis
593	New IFRSs [member]	Member			ifrs-full:NewIFRSsMember
594	IFRS 16 [member]	Member			shi:IFRS16Member
595	Disclosure of expected impact of initial application of new standards or interpretations [line items]	LineItems			ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
596	Operating lease commitments	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
597	Commitments relate to short-term leases	Concept (Monetary)	As Of	Credit	ifrs-full:LeaseCommitmentsForShorttermLeasesForWhichRecognitionExemptionHasBeenUsed
598	Estimated right-of-use assets	Concept (Monetary)	As Of	Debit	ifrs-full:RightofuseAssets
599	Estimated lease liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:LeaseLiabilities
600	40202 - Disclosure - Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails
601	Disclosure of detailed information about property, plant and equipment [table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
602	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
603	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
604	Buildings [member]	Member			ifrs-full:BuildingsMember
605	Plant and machinery [member]	Member			shi:PlantAndMachineryMember
606	Vehicles and other equipment [member]	Member			shi:VehiclesAndOtherEquipmentMember
607	Disclosure of detailed information about property, plant and equipment [line items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
608	Estimated useful lives of property, plant and equipment	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
609	40203 - Disclosure - Summary of Significant Accounting Policies (Investment Properties) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesInvestmentPropertiesDetails
610	Implied Table	Table	*	*	implied:Table
611	Investment properties [abstract]	Abstract			ifrs-full:DisclosureOfInvestmentPropertyAbstract
612	Estimated useful lives of investment properties	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrDepreciationRatesInvestmentPropertyCostModel
613	40204 - Disclosure - Summary of Significant Accounting Policies (Lease Prepayments and Other Non-current Assets) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SummaryOfSignificantAccountingPoliciesLeasePrepaymentsAndOtherNoncurrentAssetsDetails
614	Disclosure of information about lease prepayments and other non-current assets [table]	Table	*	*	shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsTable
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617	Land use rights [member]	Member			shi:LandUseRightsMember
618	Patents [member]	Member			ifrs-full:CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember
619	Catalyst [member]	Member			shi:CatalystMember
620	Disclosure of information about lease prepayments and other non-current assets [line items]	LineItems			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsLineItems
621	Estimated useful lives of lease prepayments and other non-current assets	Concept (Text/String)	For Period		shi:UsefulLivesOrAmortisationRatesLeasePrepaymentsAndOtherAssets
622	40301 - Disclosure - Changes in Accounting Policies (IFRS 9 Financial Instruments, Effects Resulting from Reclassification) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ChangesInAccountingPoliciesIfrs9FinancialInstrumentsEffectsResultingFromReclassification
623	Disclosure of initial application of standards or interpretations [table]	Table	*	*	ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable
624	Initially applied IFRSs [axis]	Axis			ifrs-full:InitiallyAppliedIFRSsAxis
625	Initially applied IFRSs [member]	Member			ifrs-full:InitiallyAppliedIFRSsMember
626	IAS 39 [member]	Member			shi:IAS39Member
627	IFRS 9 [member]	Member			shi:IFRS9Member
628	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
629	Currently stated [member]	Member			ifrs-full:RestatedMember
630	Increase (decrease) due to application of IFRS 9 [member]	Member			shi:IncreaseDecreaseDueToApplicationOfIFRS9Member
631	Disclosure of initial application of standards or interpretations [line items]	LineItems			ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
632	Financial assets at fair value through other comprehensive income	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
633	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
634	Bills receivable	Concept (Monetary)	As Of	Debit	shi:BillsReceivables
635	40302 - Disclosure - Changes in Accounting Policies (IFRS 9 Financial Instruments, Total Impact on Retained Earnings) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ChangesInAccountingPoliciesIfrs9FinancialInstrumentsTotalImpactOnRetainedEarnings
636	Disclosure of initial application of standards or interpretations [table]	Table	*	*	ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable
637	Initially applied IFRSs [axis]	Axis			ifrs-full:InitiallyAppliedIFRSsAxis
638	Initially applied IFRSs [member]	Member			ifrs-full:InitiallyAppliedIFRSsMember
639	IAS 39 [member]	Member			shi:IAS39Member
640	IFRS 9 [member]	Member			shi:IFRS9Member
641	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
642	Currently stated [member]	Member			ifrs-full:RestatedMember
643	Increase (decrease) due to application of IFRS 9 [member]	Member			shi:IncreaseDecreaseDueToApplicationOfIFRS9Member
644	Disclosure of initial application of standards or interpretations [line items]	LineItems			ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
645	Retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
646	40303 - Disclosure - Changes in Accounting Policies (IFRS 15 Revenue from Contracts with Customers) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ChangesInAccountingPoliciesIfrs15RevenueFromContractsWithCustomers
647	Disclosure of initial application of standards or interpretations [table]	Table	*	*	ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable
648	Initially applied IFRSs [axis]	Axis			ifrs-full:InitiallyAppliedIFRSsAxis
649	Initially applied IFRSs [member]	Member			ifrs-full:InitiallyAppliedIFRSsMember
650	IAS 18 carrying amount [member]	Member			shi:IAS18Member
651	IFRS 15 carrying amount [member]	Member			shi:IFRS15Member
652	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
653	Currently stated [member]	Member			ifrs-full:RestatedMember
654	Reclassification [member]	Member			ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
655	Disclosure of initial application of standards or interpretations [line items]	LineItems			ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
656	Advance from customers	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentAdvances
657	Contract liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentContractLiabilities
658	Revenue recognized relates to carried - forward contract liabilities	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractLiabilities
659	40401 - Disclosure - Financial Risk Management (Financial Risk Factors, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagementFinancialRiskFactorsNarrativeDetails
660	Disclosure of nature and extent of risks arising from financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
661	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
662	Risks [member]	Member			ifrs-full:TypesOfRisksMember
663	Foreign exchange risk [member]	Member			ifrs-full:CurrencyRiskMember
664	Cash flow and fair value interest rate risk [member]	Member			ifrs-full:InterestRateRiskMember
665	Liquidity risk [member]	Member			ifrs-full:LiquidityRiskMember
666	Types of interest rates [axis]	Axis			ifrs-full:TypesOfInterestRatesAxis
667	Interest rate types [member]	Member			ifrs-full:InterestRateTypesMember
668	Floating interest rate [member]	Member			ifrs-full:FloatingInterestRateMember
669	Maturity [axis]	Axis			ifrs-full:MaturityAxis
670	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
671	Later than one year [member]	Member			ifrs-full:LaterThanOneYearMember
672	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
673	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
674	US dollar foreign exchange options [member]	Member			ifrs-full:OptionContractMember
675	US dollar forward foreign exchange contracts [member]	Member			ifrs-full:ForwardContractMember
676	Disclosure of nature and extent of risks arising from financial instruments [line items]	LineItems			ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
677	Maturity period of foreign exchange option contracts entered	Concept (xbrli:durationItemType)	For Period		shi:MaximumMaturityPeriodOfForeignExchangeOptionContractsEntered
678	Nominal amount	Concept (Monetary)	As Of		ifrs-full:NotionalAmount
679	Description of change in foreign exchange risk/interest rate risk with all other variables held constant	Concept (Text/String)	For Period		ifrs-full:ChangesInExposureToRisk
680	Description of change in net profit	Concept (Text/String)	For Period		shi:DescriptionOfChangeInNetProfitLoss
681	Foreign currencies weakened/strengthened rate against RMB	Concept (Percent)	As Of		shi:RateOfForeignCurrenciesAgainstReportingCurrencyWeakenedStrengthenedForSensitivityAnalysisOfFinancialRisk
682	Estimated change in net profit due to sensitivity analysis	Concept (Monetary)	For Period	Credit	shi:EstimatedIncreaseDecreaseInNetProfitDueToSensitivityAnalysisOfFinancialRisk
683	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
684	Short-term borrowings, percentage of total borrowing balance	Concept (Percent)	For Period		shi:ShortTermInterestBearingBorrowingsPercentageOfTotalBorrowings
685	Interest rates on the floating rate borrowings risen/fallen basis points	Concept (Percent)	As Of		shi:BasisPointsOfInterestRatesRisenFallenForSensitivityAnalysisOfFinancialRisk
686	Credit facilities with several PRC financial institutions	Concept (Monetary)	As Of	Credit	shi:MaximumCreditFacility
687	Unused facilities	Concept (Monetary)	As Of	Credit	ifrs-full:UndrawnBorrowingFacilities
688	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
689	Trade receivables (including trade receivables with related parties and those carried at FVOCI)	Concept (Monetary)	As Of	Debit	shi:TradeReceivablesIncludingTradeReceivablesWithRelatedPartiesAndTradeReceivablesAtFairValueThroughOtherComprehensiveIncome
690	40402 - Disclosure - Financial Risk Management (Financial Risk Factors, Impairment of Financial Assets) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagementFinancialRiskFactorsImpairmentOfFinancialAssetsDetails
691	Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable
692	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
693	Risks [member]	Member			ifrs-full:TypesOfRisksMember
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695	Classes of financial instruments [axis]	Axis			ifrs-full:ClassesOfFinancialInstrumentsAxis
696	Financial instruments, class [member]	Member			ifrs-full:ClassesOfFinancialInstrumentsMember
697	Trade receivables (including receivables from related parties) [member]	Member			ifrs-full:TradeReceivablesMember
698	Other receivables (including receivables from related parties) [member]	Member			shi:OtherReceivablesMember
699	Debt instruments carries at FVOCI [member]	Member			ifrs-full:DebtSecuritiesMember
700	Initially applied IFRSs [axis]	Axis			ifrs-full:InitiallyAppliedIFRSsAxis
701	Initially applied IFRSs [member]	Member			ifrs-full:InitiallyAppliedIFRSsMember
702	IAS 39 [member]	Member			shi:IAS39Member
703	IFRS 9 [member]	Member			shi:IFRS9Member
704	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
705	Currently stated [member]	Member			ifrs-full:RestatedMember
706	Increase (decrease) due to application of IFRS 9 [member]	Member			shi:IncreaseDecreaseDueToApplicationOfIFRS9Member
707	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
708	Opening/Closing loss allowance calculated under IAS 39/IFRS 9	Concept (Monetary)	As Of	Credit	ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
709	Amounts restated through opening retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
710	Provision for loss allowance recognized in profit or loss	Concept (Monetary)	For Period		ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
711	Reversal of previous impairment losses	Concept (Monetary)	For Period		ifrs-full:ReversalAllowanceAccountForCreditLossesOfFinancialAssets
712	Receivables written off during the year as uncollectible	Concept (Monetary)	For Period	Credit	ifrs-full:DecreaseThroughWriteoffFinancialAssets
713	40403 - Disclosure - Financial Risk Management (Financial Risk Factors, Maturity Analysis for Financial Liabilities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagementFinancialRiskFactorsMaturityAnalysisForFinancialLiabilitiesDetails
714	Disclosure of financial liabilities [table]	Table	*	*	ifrs-full:DisclosureOfFinancialLiabilitiesTable
715	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
716	Risks [member]	Member			ifrs-full:TypesOfRisksMember
717	Liquidity risk [member]	Member			ifrs-full:LiquidityRiskMember
718	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
719	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
720	Undiscounted cash flow [member]	Member			shi:UndiscountedCashFlowMember
721	Maturity [axis]	Axis			ifrs-full:MaturityAxis
722	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
723	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
724	Later than one year and not later than two years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
725	Later than two years and not later than five years [member]	Member			ifrs-full:LaterThanTwoYearsAndNotLaterThanFiveYearsMember
726	Later than five years [member]	Member			ifrs-full:LaterThanFiveYearsMember
727	Disclosure of financial liabilities [line items]	LineItems			ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
728	Non-derivatives	Abstract			ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract
729	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:Borrowings
730	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToTradeSuppliers
731	Other payables	Concept (Monetary)	As Of	Credit	ifrs-full:OtherPayables
732	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToRelatedParties
733	Total non-derivatives	Concept (Monetary)	As Of	Credit	ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
734	Derivatives	Abstract			ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesAbstract
735	Derivative financial instruments	Concept (Monetary)	As Of	Credit	ifrs-full:DerivativeFinancialLiabilitiesUndiscountedCashFlows
736	40404 - Disclosure - Financial Risk Management (Fair Value Estimation, Recurring Fair Value Measurements) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialRiskManagementFairValueEstimationRecurringFairValueMeasurementsDetails
737	Financial instruments, fair value measurement [table]	Table	*	*	shi:FinancialInstrumentsFairValueMeasurementTable
738	Levels of fair value hierarchy [axis]	Axis			ifrs-full:LevelsOfFairValueHierarchyAxis
739	All levels of fair value hierarchy [member]	Member			ifrs-full:AllLevelsOfFairValueHierarchyMember
740	Level 1 of fair value hierarchy [member]	Member			ifrs-full:Level1OfFairValueHierarchyMember
741	Level 2 of fair value hierarchy [member]	Member			ifrs-full:Level2OfFairValueHierarchyMember
742	Level 3 of fair value hierarchy [member]	Member			ifrs-full:Level3OfFairValueHierarchyMember
743	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
744	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
745	Recurring fair value measurements [member]	Member			ifrs-full:RecurringFairValueMeasurementMember
746	Financial instruments, fair value measurement [line items]	LineItems			shi:FinancialInstrumentsFairValueMeasurementLineItems
747	Financial assets	Abstract			ifrs-full:DisclosureOfFairValueMeasurementOfAssetsAbstract
748	Financial assets at fair value through other comprehensive income	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
749	Structured deposits	Concept (Monetary)	As Of	Debit	shi:StructuredDeposits
750	Foreign exchange options	Concept (Monetary)	As Of	Debit	shi:ForeignExchangeOptions
751	Total finanical assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
752	Finanical liabilities	Abstract			ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesAbstract
753	Foreign exchange contracts/Forward foreign exchange contracts	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentDerivativeFinancialLiabilities
754	40501 - Disclosure - Critical Accounting Estimates and Assumptions (Recognition of Deferred Tax Assets) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CriticalAccountingEstimatesAndAssumptionsRecognitionOfDeferredTaxAssetsDetails
755	Implied Table	Table	*	*	implied:Table
756	Critical accounting estimates and assumptions [abstract]	Abstract			shi:CriticalAccountingEstimatesAndAssumptionsAbstract
757	Minimum future taxable income to fully utilize deferred tax assets	Concept (Monetary)	As Of	Credit	shi:MinimumFutureTaxableIncomeToFullyUtilizeDeferredTaxAssets
758	40601 - Disclosure - Segment Information (Operating Segments, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationOperatingSegmentsNarrativeDetails
759	Implied Table	Table	*	*	implied:Table
760	Segment information [abstract]	Abstract			ifrs-full:DisclosureOfOperatingSegmentsAbstract
761	Number of operating segments	Concept (Integer)	For Period		shi:NumberOfReportableOperatingSegments
762	40602 - Disclosure - Segment Information (Revenue) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationRevenueDetails
763	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
764	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
765	Revenue from external customer [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
766	Total segment revenue [member]	Member			ifrs-full:OperatingSegmentsMember
767	Inter-segment revenue [member]	Member			ifrs-full:EliminationOfIntersegmentAmountsMember
768	Segments [axis]	Axis			ifrs-full:SegmentsAxis
769	Segments [member]	Member			ifrs-full:SegmentsMember
770	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
771	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
772	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
773	Petroleum products [member]	Member			shi:PetroleumProductsMember
774	Trading of petrochemical products [member]	Member			shi:TradingOfPetrochemicalProductsMember
775	Other Segments [member]	Member			ifrs-full:AllOtherSegmentsMember
776	Timing of revenue recognition [axis]	Axis			shi:TimingOfRevenueRecognitionAxis
777	Timing of revenue recognition [member]	Member			shi:TimingOfRevenueRecognitionMember
778	At a point in time [member]	Member			shi:RevenueRecognizedAtAPointInTimeMember
779	Over time [member]	Member			shi:RevenueRecognizedOverTimeMember
780	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
781	Segment revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
782	Total gross (loss)/profit	Concept (Monetary)	For Period	Credit	ifrs-full:GrossProfit
783	40603 - Disclosure - Segment Information (Segment Result - Profit/(Loss) from Operations) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationSegmentResultProfitlossFromOperationsDetails
784	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
785	Segments [axis]	Axis			ifrs-full:SegmentsAxis
786	Segments [member]	Member			ifrs-full:SegmentsMember
787	Petroleum products [member]	Member			shi:PetroleumProductsMember
788	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
789	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
790	Trading of petrochemical products [member]	Member			shi:TradingOfPetrochemicalProductsMember
791	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
792	Others [member]	Member			ifrs-full:AllOtherSegmentsMember
793	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
794	Segment result - Profit/(loss) from operations	Abstract			ifrs-full:ProfitLossAbstract
795	Profit from operations	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossFromOperatingActivities
796	Net finance income	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncomeCost
797	Share of net profit of associates and joint ventures accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
798	Profit before income tax	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
799	40604 - Disclosure - Segment Information (Other Profit and Loss Disclosures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationOtherProfitAndLossDisclosuresDetails
800	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
801	Segments [axis]	Axis			ifrs-full:SegmentsAxis
802	Segments [member]	Member			ifrs-full:SegmentsMember
803	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
804	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
805	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
806	Petroleum products [member]	Member			shi:PetroleumProductsMember
807	Trading of petrochemical products [member]	Member			shi:TradingOfPetrochemicalProductsMember
808	Others [member]	Member			ifrs-full:AllOtherSegmentsMember
809	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
810	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
811	Impairment loss	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLoss
812	Inventory write-down	Concept (Monetary)	For Period	Debit	ifrs-full:WritedownsReversalsOfInventories
813	40605 - Disclosure - Segment Information (Assets) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationAssetsDetails
814	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
815	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
816	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
817	Allocated amounts [member]	Member			ifrs-full:OperatingSegmentsMember
818	Unallocated amounts [member]	Member			ifrs-full:UnallocatedAmountsMember
819	Segments [axis]	Axis			ifrs-full:SegmentsAxis
820	Segments [member]	Member			ifrs-full:SegmentsMember
821	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
822	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
823	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
824	Petroleum products [member]	Member			shi:PetroleumProductsMember
825	Trading of petrochemical products [member]	Member			shi:TradingOfPetrochemicalProductsMember
826	Others [member]	Member			ifrs-full:AllOtherSegmentsMember
827	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
828	Investments accounted for using the equity method	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
829	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
830	Time deposits with financial institutions	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
831	Deferred income tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetDeferredTaxAssets
832	Financial assets at fair value through profit or loss	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
833	Others	Concept (Monetary)	As Of	Debit	ifrs-full:OtherAssets
834	Assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
835	40606 - Disclosure - Segment Information (Liabilities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationLiabilitiesDetails
836	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
837	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
838	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
839	Allocated amounts [member]	Member			ifrs-full:OperatingSegmentsMember
840	Unallocated amounts [member]	Member			ifrs-full:UnallocatedAmountsMember
841	Segments [axis]	Axis			ifrs-full:SegmentsAxis
842	Segments [member]	Member			ifrs-full:SegmentsMember
843	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
844	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
845	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
846	Petroleum products [member]	Member			shi:PetroleumProductsMember
847	Trading of petrochemical products [member]	Member			shi:TradingOfPetrochemicalProductsMember
848	Others [member]	Member			ifrs-full:AllOtherSegmentsMember
849	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
850	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
851	Financial liabilities at fair value through profit or loss	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilitiesAtFairValueThroughProfitOrLoss
852	Liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
853	40607 - Disclosure - Segment Information (Additions to Property, Plant and Equipment, Construction in Progress, Lease Prepayments and Other Assets) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationAdditionsToPropertyPlantAndEquipmentConstructionInProgressLeasePrepaymentsAndOtherAssetsDetails
854	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
855	Segments [axis]	Axis			ifrs-full:SegmentsAxis
856	Segments [member]	Member			ifrs-full:SegmentsMember
857	Synthetic fibres [member]	Member			shi:SyntheticFibresMember
858	Resins and plastics [member]	Member			shi:ResinsAndPlasticsMember
859	Intermediate petrochemicals [member]	Member			shi:IntermediatePetrochemicalsMember
860	Petroleum products [member]	Member			shi:PetroleumProductsMember
861	Others [member]	Member			ifrs-full:AllOtherSegmentsMember
862	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
863	Additions to property, plant and equipment, construction in progress, lease prepayments and other assets	Abstract			shi:AdditionsToPropertyPlantAndEquipmentConstructionInProgressLeasePrepaymentsAndOtherAssetsAbstract
864	Additions to property, plant and equipment, construction in progress, lease prepayments and other assets	Concept (Monetary)	For Period	Debit	shi:AdditionsToPropertyPlantAndEquipmentConstructionInProgressLeasePrepaymentsAndOtherAssets
865	40608 - Disclosure - Segment Information (Entity-wide information) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SegmentInformationEntitywideInformationDetails
866	Disclosure of major customers [table]	Table	*	*	ifrs-full:DisclosureOfMajorCustomersTable
867	Major customers [axis]	Axis			ifrs-full:MajorCustomersAxis
868	Customers [member]	Member			ifrs-full:MajorCustomersMember
869	Single customer [member]	Member			shi:SingleCustomerMember
870	Disclosure of operating segments [line items]	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
871	Revenue derived from a single customer	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
872	40701 - Disclosure - Other Operating Income (Details)	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingIncomeDetails
873	Implied Table	Table	*	*	implied:Table
874	Other operating income [abstract]	Abstract			shi:OtherOperatingIncomeAbstract
875	Government grants	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromGovernmentGrants
876	Rental income from investment property	Concept (Monetary)	For Period	Credit	ifrs-full:RentalIncomeFromInvestmentProperty
877	Others	Concept (Monetary)	For Period	Credit	ifrs-full:MiscellaneousOtherOperatingIncome
878	Other operating income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
879	Grants related to R&D and other tax refund	Concept (Monetary)	For Period	Credit	shi:GovernmentGrantsRelatingToResearchAndDevelopmentAndOtherTaxRefund
880	Government grants relating to the purchase of property, plant and equipment	Concept (Monetary)	For Period	Credit	shi:GovernmentGrantsRelatingToPurchaseOfPropertyPlantAndEquipment
881	40801 - Disclosure - Other Operating Expenses (Details)	Network	*	*	http://www.spc-ir.com.hk/role/OtherOperatingExpensesDetails
882	Implied Table	Table	*	*	implied:Table
883	Other operating expenses [abstract]	Abstract			shi:OtherOperatingExpensesAbstract
884	Cost related to lease of investment properties	Concept (Monetary)	For Period	Debit	ifrs-full:DirectOperatingExpenseFromInvestmentProperty
885	Others	Concept (Monetary)	For Period	Debit	ifrs-full:MiscellaneousOtherOperatingExpense
886	Other operating expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OtherExpenseByFunction
887	40901 - Disclosure - Other (losses)/gains - net (Details)	Network	*	*	http://www.spc-ir.com.hk/role/OtherLossesgainsNetDetails
888	Disclosure of subsidiaries [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
889	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
890	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
891	Zhejiang Jin Yong Acrylic Fibre Company Limited [member]	Member			shi:ZhejiangJinYongAcrylicFibreCompanyLimitedMember
892	Disclosure of other (losses)/gains - net [line items]	LineItems			shi:DisclosureOfOtherLossesGainsNetLineItems
893	Net (Losses)/gains on disposal of property, plant and equipment	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment
894	(Losses)/Gains from structured deposits	Concept (Monetary)	For Period	Credit	shi:GainsLossesFromStructuredDeposits
895	Net gains on settlement of forward foreign exchange contracts	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnSettlementOfForeignExchangeContract
896	Net gains on settlement of foreign exchange option contracts	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnFairValueChangeOfForeignExchangeOptionConract
897	Gains from disposal of subsidiary	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesRecognisedWhenControlInSubsidiaryIsLost
898	Fair value losses on foreign exchange option and forward exchange contracts	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
899	Net foreign exchange gains/(losses)	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
900	Gains from disposal of joint venture	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnDisposalsOfInvestmentsInJointVentures
901	Other (losses)/gains - net	Concept (Monetary)	For Period	Credit	ifrs-full:OtherGainsLosses
902	41001 - Disclosure - Finance Income and Expenses (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinanceIncomeAndExpensesDetails
903	Implied Table	Table	*	*	implied:Table
904	Finance income and expenses [abstract]	Abstract			shi:FinanceIncomeAndExpensesAbstract
905	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromInterest
906	Net foreign exchange gain	Concept (Monetary)	For Period	Credit	ifrs-full:NetForeignExchangeGain
907	Finance income	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncome
908	Interest on bank and other borrowings	Concept (Monetary)	For Period	Debit	ifrs-full:InterestExpenseOnBorrowings
909	Less: amounts capitalized on qualifying assets	Concept (Monetary)	For Period		ifrs-full:InterestCostsCapitalised
910	Net interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:InterestExpense
911	Net foreign exchange loss	Concept (Monetary)	For Period	Debit	ifrs-full:NetForeignExchangeLoss
912	Finance expenses	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
913	Finance income - net	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncomeCost
914	41101 - Disclosure - Expense by Nature (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ExpenseByNatureDetails
915	Implied Table	Table	*	*	implied:Table
916	Expense by nature [abstract]	Abstract			ifrs-full:ExpenseByNatureAbstract
917	Cost of raw material	Concept (Monetary)	For Period	Debit	ifrs-full:RawMaterialsAndConsumablesUsed
918	Cost of trading products	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfMerchandiseSold
919	Employee benefit expenses	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
920	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
921	Repairs and maintenance expenses	Concept (Monetary)	For Period	Debit	ifrs-full:RepairsAndMaintenanceExpense
922	Transportation costs	Concept (Monetary)	For Period	Debit	ifrs-full:TransportationExpense
923	Sales commissions	Concept (Monetary)	For Period	Debit	ifrs-full:FeeAndCommissionExpense
924	Leasing expenses	Concept (Monetary)	For Period	Debit	ifrs-full:RentalExpense
925	Inventory write-down	Concept (Monetary)	For Period	Debit	ifrs-full:WritedownsReversalsOfInventories
926	Impairment loss	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
927	Auditors' remuneration - audit services	Concept (Monetary)	For Period	Debit	ifrs-full:AuditorsRemunerationForAuditServices
928	Change of goods in process and finished goods	Concept (Monetary)	For Period	Debit	ifrs-full:ChangesInInventoriesOfFinishedGoodsAndWorkInProgress
929	Other expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OtherExpenseByNature
930	Total cost of sales, selling and administrative expenses	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseByNature
931	41201 - Disclosure - Employee Benefit Expenses (Details)	Network	*	*	http://www.spc-ir.com.hk/role/EmployeeBenefitExpensesDetails
932	Implied Table	Table	*	*	implied:Table
933	Employee benefit expenses [abstract]	Abstract			ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
934	Wages and salaries	Concept (Monetary)	For Period	Debit	ifrs-full:WagesAndSalaries
935	Social welfare costs	Concept (Monetary)	For Period	Debit	ifrs-full:SocialSecurityContributions
936	Others	Concept (Monetary)	For Period	Debit	ifrs-full:OtherEmployeeExpense
937	Share-based payments granted to directors and employees	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
938	Total employee benefit expense	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
939	Number of individuals with the highest emoluments disclosed	Concept (Integer)	For Period		shi:NumberOfEmployeesWithHighestEmolumentsDisclosed
940	41301 - Disclosure - Income Tax (Major Components of Income Tax Expense) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxMajorComponentsOfIncomeTaxExpenseDetails
941	Implied Table	Table	*	*	implied:Table
942	Major components of tax expense [abstract]	Abstract			ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
943	Current income tax	Concept (Monetary)	For Period	Debit	ifrs-full:CurrentTaxExpenseIncome
944	Deferred taxation	Concept (Monetary)	For Period	Debit	ifrs-full:DeferredTaxExpenseIncome
945	Income tax expense	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
946	41302 - Disclosure - Income Tax (Reconciliation of Income Tax) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxReconciliationOfIncomeTaxDetails
947	Implied Table	Table	*	*	implied:Table
948	Reconciliation of income tax [abstract]	Abstract			ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract
949	Profit before income tax	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
950	Expected PRC income tax at the statutory tax rate of 25%	Concept (Monetary)	For Period	Debit	ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
951	Tax effect of share of profit of investments accounted for using the equity method	Concept (Monetary)	For Period	Credit	shi:TaxEffectOfShareOfProfitLossOfInvestmentAccountedForUsingEquityMethod
952	Tax effect of other non-taxable income	Concept (Monetary)	For Period	Credit	ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
953	Tax effect of non-deductible loss, expenses and costs	Concept (Monetary)	For Period	Debit	ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
954	True up for final settlement of enterprise income taxes in respect of previous years	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
955	Tax losses for which no deferred income tax asset was recognized	Concept (Monetary)	For Period	Debit	ifrs-full:TaxEffectOfTaxLosses
956	Utilization of previously unrecognized tax losses	Concept (Monetary)	For Period	Credit	shi:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossOfPriorPeriodUsedToReduceIncomeTaxExpense
957	Temporary differences for which no deferred income tax asset was recognized in current year	Concept (Monetary)	For Period	Debit	shi:TemporaryDifferencesForWhichNoDeferredTaxAssetRecognised
958	Utilisation of previously unrecognized temporary differences	Concept (Monetary)	For Period	Credit	shi:TaxBenefitArisingFromPreviouslyUnrecognisedTemporaryDifferenceOfPriorPeriodUsedToReduceIncomeTaxExpense
959	Income tax expense	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
960	PRC income tax rate	Concept (Percent)	For Period		ifrs-full:ApplicableTaxRate
961	41303 - Disclosure - Income Tax (Deferred Tax Assets and Deferred Tax Liabilities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxDeferredTaxAssetsAndDeferredTaxLiabilitiesDetails
962	Deferred tax assets and liabilities [table]	Table	*	*	ifrs-full:DisclosureOfAmountsToBeRecoveredOrSettledAfterTwelveMonthsForClassesOfAssetsAndLiabilitiesThatContainAmountsToBeRecoveredOrSettledBothNoMoreAndMoreThanTwelveMonthsAfterReportingDateTable
963	Maturity [axis]	Axis			ifrs-full:MaturityAxis
964	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
965	After more than 12 months [member]	Member			ifrs-full:LaterThanOneYearMember
966	Within one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
967	Deferred tax assets and liabilities [line items]	LineItems			ifrs-full:DisclosureOfAmountsToBeRecoveredOrSettledAfterTwelveMonthsForClassesOfAssetsAndLiabilitiesThatContainAmountsToBeRecoveredOrSettledBothNoMoreAndMoreThanTwelveMonthsAfterReportingDateLineItems
968	Deferred tax assets:	Abstract			shi:DeferredTaxAssetsAbstract
969	Deferred tax asset to be recovered	Concept (Monetary)	As Of	Debit	ifrs-full:DeferredTaxAssets
970	Deferred tax liabilities:	Abstract			shi:DeferredTaxLiabilitiesAbstract1
971	Deferred tax liabilities to be recovered	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilities
972	Deferred tax assets - net	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
973	41304 - Disclosure - Income Tax (Movements in Deferred Tax Assets and Liabilities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxMovementsInDeferredTaxAssetsAndLiabilitiesDetails
974	Disclosure of temporary difference, unused tax losses and unused tax credits [table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
975	Assets and liabilities [axis]	Axis			ifrs-full:AssetsAndLiabilitiesAxis
976	Deferred tax assets - net [member]	Member			ifrs-full:AssetsAndLiabilitiesMember
977	Deferred tax assets [member]	Member			shi:DeferredTaxAssetsMember
978	Deferred tax liabilities [member]	Member			shi:DeferredTaxLiabilitiesMember
979	Temporary difference, unused tax losses and unused tax credits [axis]	Axis			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
980	Temporary difference, unused tax losses and unused tax credits [member]	Member			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
981	Impairment for bad and doubtful debts and provision for inventories [member]	Member			shi:ImpairmentForBadAndDoubtfulDebtsAndProvisionForInventoriesAndPayrollPayablesMember
982	Provision for impairment losses in fixed assets and construction in progress [member]	Member			shi:ProvisionForImpairmentLossesInFixedAssetsConstructionInProgressMember
983	Difference in depreciation [member]	Member			shi:DifferenceInDepreciationMember
984	Share-based payments [member]	Member			shi:SharebasedPaymentMember
985	Others [member]	Member			ifrs-full:OtherTemporaryDifferencesMember
986	Capitalization of borrowing costs and others [member]	Member			shi:CapitalizationOfBorrowingCostsAndOthersMember
987	Movements in deferred tax assets and liabilities [line items]	LineItems			ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
988	Balance at 1 January	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
989	Recognized in income statement	Concept (Monetary)	For Period		ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
990	Balance at 31 December	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
991	41305 - Disclosure - Income Tax (Deferred Tax Assets Not Recognized) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/IncomeTaxDeferredTaxAssetsNotRecognizedDetails
992	Disclosure of temporary difference, unused tax losses and unused tax credits [table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
993	Temporary difference, unused tax losses and unused tax credits [axis]	Axis			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
994	Temporary difference, unused tax losses and unused tax credits [member]	Member			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
995	Impairment losses on property, plant and equipment [member]	Member			shi:ImpairmentLossesOnPropertyPlantAndEquipmentMember
996	Unused tax losses carried forward [member]	Member			ifrs-full:UnusedTaxLossesMember
997	Maturity [axis]	Axis			ifrs-full:MaturityAxis
998	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
999	2018 [member]	Member			ifrs-full:NotLaterThanOneYearMember
1000	2019 [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1001	2020 [member]	Member			ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1002	2021 [member]	Member			ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
1003	2022 [member]	Member			ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
1004	2023 [member]	Member			ifrs-full:LaterThanFiveYearsMember
1005	Disclosure of deferred tax assets not recognized [line items]	LineItems			shi:DisclosureOfDeferredTaxAssetsNotRecognizedLineItems
1006	Deferred tax assets not recognized in respect of temporary differences	Concept (Monetary)	As Of		ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
1007	Deferred tax assets not recognized in respect of unused tax losses carried forward	Concept (Monetary)	As Of		ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
1008	41401 - Disclosure - Earnings per Share (Basic) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/EarningsPerShareBasicDetails
1009	Implied Table	Table	*	*	implied:Table
1010	Basic earnings per share [abstract]	Abstract			ifrs-full:BasicEarningsPerShareAbstract
1011	Net profit attributable to shareholders of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1012	Weighted average number of ordinary shares in issue (thousands of shares)	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
1013	Basic earnings per share (RMB per share)	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
1014	Basic earnings per ADS(RMB per ADS)	Concept (Share)	For Period		shi:BasicEarningsLossPerAmericanDepositaryShare
1015	41402 - Disclosure - Earnings per Share (Diluted) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/EarningsPerShareDilutedDetails
1016	Implied Table	Table	*	*	implied:Table
1017	Diluted earnings per share [abstract]	Abstract			ifrs-full:DilutedEarningsPerShareAbstract
1018	Net profit attributable to shareholders of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1019	Weighted average number of ordinary shares in issue (thousands of shares)	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
1020	Adjustments for share options granted (thousands of shares)	Concept (Shares)	For Period		ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1021	Weighted average number of ordinary shares for diluted earnings per share (thousands of shares)	Concept (Shares)	For Period		ifrs-full:AdjustedWeightedAverageShares
1022	Diluted earnings per share (RMB per share)	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
1023	Diluted earnings per ADS (RMB per ADS)	Concept (Share)	For Period		shi:DilutedEarningsLossPerAmericanDepositaryShare
1024	Number of H shares represented by each ADS	Concept (Shares)	For Period		shi:NumberOfHSharesRepresentedByPerAmericanDepositaryShares
1025	41501 - Disclosure - Lease Prepayments and Other Non-current Assets (Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/LeasePrepaymentsAndOtherNoncurrentAssetsNetBookAmountDetails
1026	Disclosure of information about lease prepayments and other non-current assets [table]	Table	*	*	shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsTable
1027	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1028	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1029	Land use rights [member]	Member			shi:LandUseRightsMember
1030	Other Intangible assets [member]	Member			ifrs-full:OtherIntangibleAssetsMember
1031	Long-term prepaid expense [member]	Member			shi:LongTermPrepaidExpenseMember
1032	Total [member]	Member			shi:LeasePrepaymentsAndOtherAssetsMember
1033	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1034	Net book amount [member]	Member			ifrs-full:CarryingAmountMember
1035	Cost [member]	Member			ifrs-full:GrossCarryingAmountMember
1036	Accumulated amortization [member]	Member			ifrs-full:AccumulatedDepreciationAndAmortisationMember
1037	Disclosure of information about lease prepayments and other non-current assets [line items]	LineItems			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsLineItems
1038	Lease prepayments and other non-current assets	Concept (Monetary)	As Of	Debit	shi:NoncurrentLeasePrepaymentsAndOtherAssets
1039	41502 - Disclosure - Lease Prepayments and Other Non-current Assets (Movement in Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/LeasePrepaymentsAndOtherNoncurrentAssetsMovementInNetBookAmountDetails
1040	Disclosure of information about lease prepayments and other non-current assets [table]	Table	*	*	shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsTable
1041	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1042	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1043	Land use rights [member]	Member			shi:LandUseRightsMember
1044	Other Intangible assets [member]	Member			ifrs-full:OtherIntangibleAssetsMember
1045	Long-term prepaid expense [member]	Member			shi:LongTermPrepaidExpenseMember
1046	Total [member]	Member			shi:LeasePrepaymentsAndOtherAssetsMember
1047	Disclosure of information about lease prepayments and other non-current assets [line items]	LineItems			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsLineItems
1048	Opening net book amount	Concept (Monetary)	As Of	Debit	shi:NoncurrentLeasePrepaymentsAndOtherAssets
1049	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsToNoncurrentAssets
1050	Charge for the year	Concept (Monetary)	For Period	Debit	ifrs-full:AmortisationExpense
1051	Reclassified to prepayments	Concept (Monetary)	For Period	Debit	shi:CurrentPortionOfNoncurrentLeasePrepaymentsAndOtherAssetsReclassifiedToPrepayments
1052	Transferred from property, plant and equipment	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughTransfersFromToPropertyPlantAndEquipmentLeasePrepaymentsAndOtherAssets
1053	Transferred to assets classified as held for sale	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughTransfersToAssetsClassifiedAsHeldForSale
1054	Closing net book amount	Concept (Monetary)	As Of	Debit	shi:NoncurrentLeasePrepaymentsAndOtherAssets
1055	41503 - Disclosure - Lease Prepayments and Other Non-current Assets (Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/LeasePrepaymentsAndOtherNoncurrentAssetsNarrativeDetails
1056	Disclosure of information about lease prepayments and other non-current assets [table]	Table	*	*	shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsTable
1057	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1058	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1059	Lease prepayments and other non-current assets [member]	Member			shi:LeasePrepaymentsAndOtherAssetsMember
1060	Disclosure of information about lease prepayments and other non-current assets [line items]	LineItems			shi:DisclosureOfInformationAboutLeasePrepaymentsAndOtherAssetsLineItems
1061	Amortization charged in cost of sales	Concept (Monetary)	For Period	Debit	shi:AmortisationExpenseChargedToCostOfSales
1062	41601 - Disclosure - Property, Plant and Equipment (Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/PropertyPlantAndEquipmentNetBookAmountDetails
1063	Disclosure of detailed information about property, plant and equipment [table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1064	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1065	Total [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
1066	Buildings [member]	Member			ifrs-full:BuildingsMember
1067	Plant and machinery [member]	Member			shi:PlantAndMachineryMember
1068	Vehicles and other equipment [member]	Member			shi:VehiclesAndOtherEquipmentMember
1069	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1070	Net book amount [member]	Member			ifrs-full:CarryingAmountMember
1071	Cost [member]	Member			ifrs-full:GrossCarryingAmountMember
1072	Accumulated depreciation [member]	Member			ifrs-full:AccumulatedDepreciationAndAmortisationMember
1073	Impairment loss [member]	Member			ifrs-full:AccumulatedImpairmentMember
1074	Disclosure of detailed information about property, plant and equipment [line items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1075	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1076	41602 - Disclosure - Property, Plant and Equipment (Movement in Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/PropertyPlantAndEquipmentMovementInNetBookAmountDetails
1077	Disclosure of detailed information about property, plant and equipment [table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1078	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1079	Total [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
1080	Buildings [member]	Member			ifrs-full:BuildingsMember
1081	Plant and machinery [member]	Member			shi:PlantAndMachineryMember
1082	Vehicles and other equipment [member]	Member			shi:VehiclesAndOtherEquipmentMember
1083	Disclosure of detailed information about property, plant and equipment [line items]	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1084	Opening net book amount	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1085	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1086	Disposals	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsPropertyPlantAndEquipment
1087	Disposal of subsidiaries	Concept (Monetary)	For Period	Credit	shi:DisposalsOfSubsidiariesPropertyPlantAndEquipment
1088	Reclassification	Concept (Monetary)	For Period	Debit	shi:ReclassificationAdjustmentsOnPropertyPlantAndEquipment
1089	Transferred from construction in progress	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughTransfersFromConstructionInProgressPropertyPlantAndEquipment
1090	Transferred to investment property	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughTransfersFromToInvestmentPropertyPropertyPlantAndEquipment
1091	Transferred to lease prepayments and other non-current assets	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughTransfersFromToLeasePrepaymentsAndOtherAssetsPropertyPropertyPlantAndEquipment
1092	Charge for the year	Concept (Monetary)	For Period		ifrs-full:DepreciationPropertyPlantAndEquipment
1093	Impairment loss	Concept (Monetary)	For Period		ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1094	Closing net book amount	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1095	41603 - Disclosure - Property, Plant and Equipment (Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/PropertyPlantAndEquipmentNarrativeDetails
1096	Implied Table	Table	*	*	implied:Table
1097	Property, plant and equipment [abstract]	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
1098	Amount of depreciation expense charged to cost of sales	Concept (Monetary)	For Period	Debit	shi:DepreciationExpenseChargedToCostOfSalesPropertyPlantAndEquipment
1099	Amount of depreciation expense charged to selling and administrative expense	Concept (Monetary)	For Period	Debit	shi:DepreciationExpenseChargedToSellingAndAdministrativeExpensePropertyPlantAndEquipment
1100	Impairment provision on property, plant and equipment	Concept (Monetary)	For Period		ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1101	41701 - Disclosure - Investment Properties (Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentPropertiesNetBookAmountDetails
1102	Disclosure of detailed information about investment properties [table]	Table	*	*	ifrs-full:DisclosureOfInvestmentPropertyTable
1103	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1104	Net book amount [member]	Member			ifrs-full:CarryingAmountMember
1105	Cost [member]	Member			ifrs-full:GrossCarryingAmountMember
1106	Accumulated depreciation [member]	Member			ifrs-full:AccumulatedDepreciationAndAmortisationMember
1107	Disclosure of detailed information about investment properties [line items]	LineItems			ifrs-full:DisclosureOfInvestmentPropertyLineItems
1108	Investment properties	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
1109	41702 - Disclosure - Investment Properties (Movement in Net Book Amount) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentPropertiesMovementInNetBookAmountDetails
1110	Implied Table	Table	*	*	implied:Table
1111	Investment properties [abstract]	Abstract			ifrs-full:DisclosureOfInvestmentPropertyAbstract
1112	Opening net book amount	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
1113	Transferred from property, plant and equipment	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughTransfersFromToPropertyPlantAndEquipmentInvestmentProperty
1114	Charge for the year	Concept (Monetary)	For Period		ifrs-full:DepreciationInvestmentProperty
1115	Closing net book amount	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
1116	41703 - Disclosure - Investment Properties (Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentPropertiesNarrativeDetails
1117	Disclosure of detailed information about investment properties [table]	Table	*	*	ifrs-full:DisclosureOfInvestmentPropertyTable
1118	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
1119	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
1120	Fair value [member]	Member			ifrs-full:AtFairValueMember
1121	Levels of fair value hierarchy [axis]	Axis			ifrs-full:LevelsOfFairValueHierarchyAxis
1122	All levels of fair value hierarchy [member]	Member			ifrs-full:AllLevelsOfFairValueHierarchyMember
1123	Level 3 of fair value hierarchy [member]	Member			ifrs-full:Level3OfFairValueHierarchyMember
1124	Disclosure of detailed information about investment properties [line items]	LineItems			ifrs-full:DisclosureOfInvestmentPropertyLineItems
1125	Estimated fair value of the investment properties	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
1126	Rental income	Concept (Monetary)	For Period	Credit	ifrs-full:RentalIncomeFromInvestmentProperty
1127	41801 - Disclosure - Construction in Progress (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ConstructionInProgressDetails
1128	Construction in progress [table]	Table	*	*	shi:ConstructionInProgressTable
1129	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1130	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1131	Construction in progress [member]	Member			ifrs-full:ConstructionInProgressMember
1132	Construction in progress [line items]	LineItems			shi:ConstructionInProgressLineItems
1133	As at 1 January	Concept (Monetary)	As Of	Debit	ifrs-full:ConstructionInProgress
1134	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsToNoncurrentAssets
1135	Transferred to property plant and equipment	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughTransfersFromToPropertyPlantAndEquipmentConstructionInProgress
1136	Impairment loss	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
1137	As at 31 December	Concept (Monetary)	As Of	Debit	ifrs-full:ConstructionInProgress
1138	Impairment loss in construction in progress	Concept (Monetary)	As Of	Debit	shi:AccumulatedImpairmentLossInConstructionInProgress
1139	Capitalized borrowing costs	Concept (Monetary)	For Period		ifrs-full:BorrowingCostsCapitalised
1140	Weighted average rate of capitalized borrowing costs	Concept (Percent)	For Period		ifrs-full:CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
1141	41901 - Disclosure - Subsidiaries (Major Subsidiaries of the Group) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SubsidiariesMajorSubsidiariesOfTheGroupDetails
1142	Disclosure of subsidiaries [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1143	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1144	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
1145	Shanghai Petrochemical Investment Development Company Limited [member]	Member			shi:ShanghaiPetrochemicalInvestmentDevelopmentCompanyLimitedMember
1146	China Jinshan Associated Trading Corporation [member]	Member			shi:ChinaJinshanAssociatedTradingCorporationMember
1147	Shanghai Jinchang Engineering Plastics Company Limited [member]	Member			shi:ShanghaiJinchangEngineeringPlasticsCompanyLimitedMember
1148	Shanghai Golden Phillips Petrochemical Company Limited [member]	Member			shi:ShanghaiGoldenPhillipsPetrochemicalCompanyLimitedMember
1149	Zhejiang Jin Yong Acrylic Fibre Company Limited [member]	Member			shi:ZhejiangJinYongAcrylicFibreCompanyLimitedMember
1150	Shanghai Golden Conti Petrochemical Company Limited [member]	Member			shi:ShanghaiGoldenContiPetrochemicalCompanyLimitedMember
1151	Shanghai Jinshan Trading Corporation [member]	Member			shi:ShanghaiJinshanTradingCorporationMember
1152	Consolidated and separate financial statements [axis]	Axis			ifrs-full:ConsolidatedAndSeparateFinancialStatementsAxis
1153	Consolidated [member]	Member			ifrs-full:ConsolidatedMember
1154	The Company [member]	Member			ifrs-full:ParentMember
1155	Disclosure of subsidiaries [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1156	Company	Concept (Text/String)	For Period		ifrs-full:NameOfSubsidiary
1157	Registered capital	Concept (Monetary)	For Period	Credit	shi:RegisteredCapital
1158	Percentage of equity directly held by the Company /held by the Group	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInSubsidiary
1159	Percentage of equity directly held by non-controlling interests	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1160	Principal activities	Concept (Text/String)	For Period		ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
1161	Total comprehensive loss/income attributable to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
1162	41902 - Disclosure - Subsidiaries (Acquisition of Golden Phillips) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SubsidiariesAcquisitionOfGoldenPhillipsDetails
1163	Disclosure of subsidiaries [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1164	Legal entity [axis]	Axis			dei:LegalEntityAxis
1165	Entity [member]	Member			dei:EntityDomain
1166	Shanghai Petrochemical Investment Development Company Limited ("Toufa") [member]	Member			shi:ShanghaiPetrochemicalInvestmentDevelopmentCompanyLimitedMember
1167	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1168	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
1169	Shanghai Golden Phillips Petrochemical Company Limited ("Golden Phillips") [member]	Member			shi:ShanghaiGoldenPhillipsPetrochemicalCompanyLimitedMember
1170	Shareholder of subsidiary [axis]	Axis			shi:ShareholdersOfLegalEntityAxis
1171	Shareholder of subsidiary [member]	Member			shi:ShareholdersOfLegalEntityMember
1172	Philips Petroleum International Investment Company ("Philips Petroleum") [member]	Member			shi:PhilipsPetroleumInternationalInvestmentCompanyMember
1173	Disclosure of subsidiaries [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1174	Remaining percentage of equity held by Philips Petroleum prior to transaction	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1175	Cash consideration paid in acquisition of Golden Phillips	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries
1176	Carrying amount of non-controlling interests acquired	Concept (Monetary)	As Of	Debit	shi:CarryingAmountOfNoncontrollingInterestsAcquiredAtAcquisitionDate
1177	Consideration paid to non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
1178	Share premium recognized in the transactions with non-controlling interests within equity - other reserves	Concept (Monetary)	As Of	Credit	ifrs-full:SharePremium
1179	42001 - Disclosure - Investments Accounted for Using the Equity Method (Investments Recognized in Balance Sheet) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodInvestmentsRecognizedInBalanceSheetDetails
1180	Disclosure of significant investments in associates and joint ventures [table]	Table	*	*	shi:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesTable
1181	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1182	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1183	Associates [member]	Member			ifrs-full:AssociatesMember
1184	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1185	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1186	Joint ventures [member]	Member			ifrs-full:JointVenturesMember
1187	Disclosure of significant investments in associates and joint ventures [line items]	LineItems			shi:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesLineItems
1188	Share of net assets	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1189	42002 - Disclosure - Investments Accounted for Using the Equity Method (Investments Recognized in Share of Profit/(Loss)) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodInvestmentsRecognizedInShareOfProfitlossDetails
1190	Implied Table	Table	*	*	implied:Table
1191	Investments recognized in share of profit/(loss) [abstract]	Abstract			ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethodAbstract
1192	Associates	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
1193	Joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod
1194	Total	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1195	42003 - Disclosure - Investments Accounted for Using the Equity Method (Investment in Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodInvestmentInAssociatesDetails
1196	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1197	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1198	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1199	Associates [member]	Member			ifrs-full:AssociatesMember
1200	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1201	As at 1 January	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1202	Share of profit	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
1203	Other comprehensive loss	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1204	Cash dividends distribution	Concept (Monetary)	For Period	Debit	shi:CashDividendDistributionFromInvestmentsAccountedForUsingEquityMethod
1205	As at 31 December	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1206	42004 - Disclosure - Investments Accounted for Using the Equity Method (Principal Activities of Material Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodPrincipalActivitiesOfMaterialAssociatesDetails
1207	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1208	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1209	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1210	Shanghai Secco Petrochemical Company Limited ("Shanghai Secco") [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1211	Shanghai Chemical Industry Park Development Company Limited ("Chemical Industry") [member]	Member			shi:ShanghaiChemicalIndustryParkDevelopmentCompanyLimitedMember
1212	Shanghai Jinsen Hydrocarbon Resins Company Limited ("Jinsen") [member]	Member			shi:ShanghaiJinsenHydrocarbonResinsCompanyLimitedMember
1213	Shanghai Azbil Automation Company Limited ("Azbil") [member]	Member			shi:ShanghaiAzbilAutomationCompanyLimitedMember
1214	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1215	Name of entity	Concept (Text/String)	For Period		ifrs-full:NameOfAssociate
1216	Place of business/country of incorporation	Concept (Text/String)	For Period		shi:PrincipalPlaceOfBusinessOrCountryOfIncorporationOfAssociatesAndJointVentures
1217	Percentage of ownership interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1218	Principal activities	Concept (Text/String)	For Period		ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
1219	Measurement method	Concept (Text/String)	For Period		ifrs-full:MethodUsedToAccountForInvestmentsInAssociates
1220	42005 - Disclosure - Investments Accounted for Using the Equity Method (Summarized Balance Sheet for Material Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodSummarizedBalanceSheetForMaterialAssociatesDetails
1221	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1222	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1223	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1224	Shanghai Secco [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1225	Chemical Industry [member]	Member			shi:ShanghaiChemicalIndustryParkDevelopmentCompanyLimitedMember
1226	Jinsen [member]	Member			shi:ShanghaiJinsenHydrocarbonResinsCompanyLimitedMember
1227	Azbil [member]	Member			shi:ShanghaiAzbilAutomationCompanyLimitedMember
1228	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1229	Current	Abstract			shi:AssetsAndLiabilitiesCurrentAbstract
1230	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
1231	Current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
1232	Non-current	Abstract			shi:AssetsAndLiabilitiesNonCurrentAbstract
1233	Non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
1234	Non-current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentLiabilities
1235	Net Assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1236	42006 - Disclosure - Investments Accounted for Using the Equity Method (Summarized Statement of Comprehensive Income for Material Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodSummarizedStatementOfComprehensiveIncomeForMaterialAssociatesDetails
1237	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1238	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1239	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1240	Shanghai Secco [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1241	Chemical Industry [member]	Member			shi:ShanghaiChemicalIndustryParkDevelopmentCompanyLimitedMember
1242	Jinsen [member]	Member			shi:ShanghaiJinsenHydrocarbonResinsCompanyLimitedMember
1243	Azbil [member]	Member			shi:ShanghaiAzbilAutomationCompanyLimitedMember
1244	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1245	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
1246	Profit/(loss) for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1247	Other comprehensive income/(loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
1248	Total comprehensive income for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
1249	Dividends declared by associate	Concept (Monetary)	For Period	Debit	shi:DividendsDeclared
1250	42007 - Disclosure - Investments Accounted for Using the Equity Method (Reconciliation of Summarized Financial Information for Material Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodReconciliationOfSummarizedFinancialInformationForMaterialAssociatesDetails
1251	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1252	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1253	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1254	Shanghai Secco [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1255	Chemical Industry [member]	Member			shi:ShanghaiChemicalIndustryParkDevelopmentCompanyLimitedMember
1256	Jinsen [member]	Member			shi:ShanghaiJinsenHydrocarbonResinsCompanyLimitedMember
1257	Azbil [member]	Member			shi:ShanghaiAzbilAutomationCompanyLimitedMember
1258	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1259	Opening net assets 1 January	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1260	Profit/(loss) for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1261	Other comprehensive loss	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
1262	Declared dividends	Concept (Monetary)	For Period	Debit	shi:DividendsDeclared
1263	Closing net assets/(deficit)	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1264	Percentage of ownership interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1265	Interest in associates	Concept (Monetary)	As Of	Debit	shi:InterestInAssociatesAndJointVentures
1266	Unrealised upstream and downstream transaction	Concept (Monetary)	As Of	Credit	shi:AdjustmentsForUnrealisedUpstreamAndDownstreamTransaction
1267	Unentitled portion	Concept (Monetary)	As Of	Credit	shi:AdjustmentsForEarningsNotSharedByOtherShareholders
1268	Carrying value	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1269	42008 - Disclosure - Investments Accounted for Using the Equity Method (Summarized Financial Information for Other Associates) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodSummarizedFinancialInformationForOtherAssociatesDetails
1270	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
1271	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1272	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1273	Other associates [member]	Member			ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
1274	Disclosure of associates [line items]	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
1275	Investments accounted for using the equity method	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1276	Aggregate amounts of the group's share of:	Abstract			shi:GroupsShareOfOtherAssociatesAbstract
1277	Profit for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1278	Total comprehensive income	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
1279	42009 - Disclosure - Investments Accounted for Using the Equity Method (Investment in Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodInvestmentInJointVenturesDetails
1280	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1281	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1282	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1283	Joint ventures [member]	Member			ifrs-full:JointVenturesMember
1284	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1285	As at 1 January	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1286	Investment addition	Concept (Monetary)	For Period	Debit	shi:InvestmentAdditionInJointVentures
1287	Share of profit	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod
1288	Cash dividends distribution	Concept (Monetary)	For Period	Debit	shi:CashDividendDistributionFromInvestmentsAccountedForUsingEquityMethod
1289	As at 31 December	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1290	42010 - Disclosure - Investments Accounted for Using the Equity Method (Principal Activities in Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodPrincipalActivitiesInJointVenturesDetails
1291	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1292	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1293	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1294	BOC [member]	Member			shi:BOCSPCGasesCompanyLimitedMember
1295	Shanghai Petrochemical Pressure Vessel Testing Center ("JYJC") [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1296	Shanghai Petrochemical Yangu Gas Development Company Limited ("Yangu Gas") [member]	Member			shi:ShanghaiPetrochemicalYanguGasDevelopmentCompanyLimitedMember
1297	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1298	Name of entity	Concept (Text/String)	For Period		ifrs-full:NameOfJointVenture
1299	Place of business/country of incorporation	Concept (Text/String)	For Period		shi:PrincipalPlaceOfBusinessOrCountryOfIncorporationOfAssociatesAndJointVentures
1300	Percentage of ownership interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInJointVenture
1301	Principal activities	Concept (Text/String)	For Period		ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
1302	Measurement method	Concept (Text/String)	For Period		ifrs-full:MethodUsedToAccountForInvestmentsInJointVentures
1303	42011 - Disclosure - Investments Accounted for Using the Equity Method (Summarized Balance Sheet for Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodSummarizedBalanceSheetForJointVenturesDetails
1304	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1305	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1306	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1307	BOC [member]	Member			shi:BOCSPCGasesCompanyLimitedMember
1308	JYJC [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1309	Yangu Gas [member]	Member			shi:ShanghaiPetrochemicalYanguGasDevelopmentCompanyLimitedMember
1310	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1311	Current	Abstract			shi:AssetsAndLiabilitiesCurrentAbstract
1312	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1313	Other current assets (excluding cash)	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentAssets
1314	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
1315	Financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
1316	Other current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentLiabilities
1317	Total current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
1318	Non-current	Abstract			shi:AssetsAndLiabilitiesNonCurrentAbstract
1319	Non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
1320	Non-current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentLiabilities
1321	Net Assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1322	42012 - Disclosure - Investments Accounted for Using the Equity Method (Summarized Statement of Comprehensive Income for Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodSummarizedStatementOfComprehensiveIncomeForJointVenturesDetails
1323	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1324	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1325	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1326	BOC [member]	Member			shi:BOCSPCGasesCompanyLimitedMember
1327	Jinpu [member]	Member			shi:ShanghaiJinpuPlasticPackingMaterialsCompanyLimitedMember
1328	JYJC [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1329	Yangu Gas [member]	Member			shi:ShanghaiPetrochemicalYanguGasDevelopmentCompanyLimitedMember
1330	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1331	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
1332	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
1333	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromInterest
1334	Interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:InterestExpense
1335	Profit/(loss) from continuing operations	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
1336	Income tax expense	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1337	Profit/(loss) for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1338	Other comprehensive income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
1339	Total comprehensive income for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
1340	Dividends declared by joint venture	Concept (Monetary)	For Period	Debit	shi:DividendsDeclared
1341	42013 - Disclosure - Investments Accounted for Using the Equity Method (Reconciliation of Summarized Financial Information for Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodReconciliationOfSummarizedFinancialInformationForJointVenturesDetails
1342	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1343	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1344	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1345	BOC [member]	Member			shi:BOCSPCGasesCompanyLimitedMember
1346	Jinpu [member]	Member			shi:ShanghaiJinpuPlasticPackingMaterialsCompanyLimitedMember
1347	JYJC [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1348	Yangu Gas [member]	Member			shi:ShanghaiPetrochemicalYanguGasDevelopmentCompanyLimitedMember
1349	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1350	Opening net assets 1 January	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1351	Net assets as at 31 March	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1352	Profit/(loss) for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1353	Other comprehensive income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
1354	Declared dividends	Concept (Monetary)	For Period	Debit	shi:DividendsDeclared
1355	Closing net assets/(deficit)	Concept (Monetary)	As Of	Debit	ifrs-full:NetAssetsLiabilities
1356	Percentage of ownership interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInJointVenture
1357	Interest in joint ventures	Concept (Monetary)	As Of	Debit	shi:InterestInAssociatesAndJointVentures
1358	Unrealised downstream transaction	Concept (Monetary)	As Of	Credit	shi:AdjustmentsForUnrealisedUpstreamAndDownstreamTransaction
1359	Carrying value	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1360	42014 - Disclosure - Investments Accounted for Using the Equity Method (Reconciliation of Summarized Financial Information for Joint Ventures, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InvestmentsAccountedForUsingTheEquityMethodReconciliationOfSummarizedFinancialInformationForJointVenturesNarrativeDetails
1361	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1362	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1363	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1364	Jinpu [member]	Member			shi:ShanghaiJinpuPlasticPackingMaterialsCompanyLimitedMember
1365	JYJC [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1366	Disclosure of joint ventures [line items]	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1367	Profit related to disposition of Jinpu	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnDisposalsOfInvestments
1368	Investment injected from a third party	Concept (Monetary)	As Of	Debit	shi:InvestmentAchievedFromThirdParty
1369	Percentage share held by a third party	Concept (Percent)	For Period		shi:ProportionOfOwnershipInterestsHeldByThirdParty
1370	Gain related to disposal of JYJC	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesRecognisedWhenControlInSubsidiaryIsLost
1371	42101 - Disclosure - Inventories (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InventoriesDetails
1372	Disclosure of detailed information about inventories [table]	Table	*	*	shi:DisclosureOfDetailedInformationAboutInventoriesTable
1373	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1374	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
1375	Gross carrying amount [member]	Member			ifrs-full:GrossCarryingAmountMember
1376	Provision for declines in the value of inventories [member]	Member			shi:ProvisionForDeclinesInValueOfInventoriesMember
1377	Disclosure of detailed information about inventories [line items]	LineItems			shi:DisclosureOfDetailedInformationAboutInventoriesLineItems
1378	Raw materials	Concept (Monetary)	As Of	Debit	ifrs-full:RawMaterials
1379	Work in progress	Concept (Monetary)	As Of	Debit	ifrs-full:WorkInProgress
1380	Finished goods	Concept (Monetary)	As Of	Debit	ifrs-full:FinishedGoods
1381	Spare parts and consumables	Concept (Monetary)	As Of	Debit	shi:SparePartsAndConsumables
1382	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:Inventories
1383	42102 - Disclosure - Inventories (Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/InventoriesNarrativeDetails
1384	Implied Table	Table	*	*	implied:Table
1385	Inventories [abstract]	Abstract			ifrs-full:ClassesOfInventoriesAbstract
1386	Cost of inventories recognized in Cost of Sales	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfInventoriesRecognisedAsExpenseDuringPeriod
1387	Inventory provision excluded in cost of sales	Concept (Monetary)	For Period	Debit	ifrs-full:WritedownsReversalsOfInventories
1388	Provision for inventory write-down	Concept (Monetary)	As Of	Debit	shi:ProvisionForInventoryWriteDown
1389	Provision reversed for sales of certain finished goods and utilisation of certain spare parts and consumables	Concept (Monetary)	For Period	Credit	shi:DecreaseOfProvisionForInventoryWriteDownDueToSaleOrUtilisationOfInventory
1390	42201 - Disclosure - Financial Assets and Financial Liabilities (Summary of Financial Instruments) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesSummaryOfFinancialInstrumentsDetails
1391	Implied Table	Table	*	*	implied:Table
1392	Financial assets and financial liabilities [abstract]	Abstract			shi:DisclosureOfFinancialAssetsAndLiabilitiesAbstract
1393	Financial assets [abstract]	Abstract			ifrs-full:CategoriesOfCurrentFinancialAssetsAbstract
1394	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
1395	Bills receivable	Concept (Monetary)	As Of	Debit	shi:BillsReceivables
1396	Other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
1397	Amounts due from related parties excluded prepayments	Concept (Monetary)	As Of	Debit	shi:TradeAndOtherCurrentReceivablesDueFromRelatedPartiesNetOfPrepayments
1398	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1399	Time deposits with banks	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
1400	Financial assets at fair value through other comprehensive income	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1401	Financial assets at fair value through profit or loss	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
1402	Total finanical assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
1403	Financial liabilities [abstract]	Abstract			ifrs-full:CategoriesOfCurrentFinancialLiabilitiesAbstract
1404	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
1405	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1406	Other payables	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentPayables
1407	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1408	Financial liabilities at fair value through profit or loss	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilitiesAtFairValueThroughProfitOrLoss
1409	Total financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilities
1410	42202 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Receivables) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherReceivablesDetails
1411	Implied Table	Table	*	*	implied:Table
1412	Trade and other receivables [abstract]	Abstract			ifrs-full:TradeAndOtherReceivablesAbstract
1413	Trade receivables	Concept (Monetary)	As Of	Debit	shi:CurrentTradeReceivablesGross
1414	Less: impairment provision	Concept (Monetary)	As Of	Credit	shi:ProvisionForImpairmentOnTradeReceivables
1415	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
1416	Bills receivable	Concept (Monetary)	As Of	Debit	shi:BillsReceivables
1417	Amounts due from related parties excluded prepayments	Concept (Monetary)	As Of	Debit	shi:TradeAndOtherCurrentReceivablesDueFromRelatedPartiesNetOfPrepayments
1418	Subtotal	Concept (Monetary)	As Of	Debit	shi:TradeReceivablesBillsReceivableAndAmountsDueFromRelatedParties
1419	Other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
1420	Trade and other current receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
1421	42203 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Receivables, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherReceivablesNarrativeDetails
1422	Disclosure of significant investments in associates and joint ventures [table]	Table	*	*	shi:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesTable
1423	Associates and joint ventures [axis]	Axis			shi:AssociatesAndJointVenturesAxis
1424	Entity's total for associates and joint ventures [member]	Member			shi:EntitysTotalForAssociatesAndJointVenturesMember
1425	Certain associates and joint ventures [member]	Member			shi:CertainAssociatesAndJointVenturesMember
1426	Disclosure of detailed information about trade and other receivable [line items]	LineItems			shi:TradeAndOtherReceivablesLineItems
1427	Dividends declared	Concept (Monetary)	For Period	Debit	shi:DividendsDeclared
1428	Dividends received	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities
1429	Interest receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentInterestReceivable
1430	42204 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Receivables, Aging Analysis of Trade Receivables, Bills Receivable and Amounts Due from Related Parties Excluded Prepayments) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherReceivablesAgingAnalysisOfTradeReceivablesBillsReceivableAndAmountsDueFromRelatedPartiesExcludedPrepaymentsDetails
1431	Disclosure of detailed information about trade and other receivable [table]	Table	*	*	shi:TradeAndOtherReceivablesTable
1432	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1433	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1434	Within one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
1435	Later than one year and not later than two years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1436	Later than two years and not later than three years [member]	Member			ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1437	Disclosure of detailed information about trade and other receivable [line items]	LineItems			shi:TradeAndOtherReceivablesLineItems
1438	Trade receivables, bills receivable and amounts due from related parties excluded prepayments	Concept (Monetary)	As Of	Debit	shi:TradeReceivablesBillsReceivableAndAmountsDueFromRelatedParties
1439	42205 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Receivables, Movements of Impairment Provision for Trade and Other Receivables) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherReceivablesMovementsOfImpairmentProvisionForTradeAndOtherReceivablesDetails
1440	Implied Table	Table	*	*	implied:Table
1441	Trade and other receivables [abstract]	Abstract			ifrs-full:TradeAndOtherReceivablesAbstract
1442	As at 1 January	Concept (Monetary)	As Of	Credit	shi:ProvisionForImpairmentOnTradeAndOtherReceivables
1443	Provision for receivables impairment	Concept (Monetary)	For Period	Credit	shi:ProvisionForImpairmentOnReceivables
1444	Receivables written off during the year as uncollectible	Concept (Monetary)	For Period	Debit	shi:ImpairmentProvisionUsedTradeAndOtherReceivables
1445	As at 31 December	Concept (Monetary)	As Of	Credit	shi:ProvisionForImpairmentOnTradeAndOtherReceivables
1446	42206 - Disclosure - Financial Assets and Financial Liabilities (Cash and Cash Equivalents) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesCashAndCashEquivalentsDetails
1447	Implied Table	Table	*	*	implied:Table
1448	Cash and cash equivalents [abstract]	Abstract			ifrs-full:CashAndCashEquivalentsAbstract
1449	Cash deposits with a related party	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
1450	Cash at bank and on hand	Concept (Monetary)	As Of	Debit	ifrs-full:Cash
1451	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1452	42207 - Disclosure - Financial Assets and Financial Liabilities (Time Deposits with banks) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTimeDepositsWithBanksDetails
1453	Time deposits with banks [table]	Table	*	*	shi:TimeDepositsWithFinancialInstitutionsTable
1454	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1455	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1456	Six months [member]	Member			shi:SixMonthsMember
1457	Range [axis]	Axis			ifrs-full:RangeAxis
1458	Ranges [member]	Member			ifrs-full:RangesMember
1459	Bottom of range [member]	Member			ifrs-full:BottomOfRangeMember
1460	Top of range [member]	Member			ifrs-full:TopOfRangeMember
1461	Time deposits with banks [line items]	LineItems			shi:TimeDepositsWithFinancialInstitutionsLineItems
1462	Time deposits with banks	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
1463	Interest rate of six-month time deposits with banks	Concept (Percent)	As Of		shi:InterestRateOnTimeDeposits
1464	42208 - Disclosure - Financial Assets and Financial Liabilities (Financial Assets at Fair Value Through Other Comprehensive Income) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeDetails
1465	Implied Table	Table	*	*	implied:Table
1466	Financial assets at fair value through other comprehensive income [abstract]	Abstract			ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAbstract
1467	Trade and bill receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1468	42209 - Disclosure - Financial Assets and Financial Liabilities (Financial Assets at Fair Value Through Profit or Loss) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesFinancialAssetsAtFairValueThroughProfitOrLossDetails
1469	Implied Table	Table	*	*	implied:Table
1470	Financial assets at fair value through profit or loss [abstract]	Abstract			ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract
1471	Structured deposits	Concept (Monetary)	As Of	Debit	shi:StructuredDeposits
1472	Foreign exchange options	Concept (Monetary)	As Of	Debit	shi:ForeignExchangeOptions
1473	Financial assets at fair value through profit or loss	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
1474	42210 - Disclosure - Financial Assets and Financial Liabilities (Borrowings) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesBorrowingsDetails
1475	Implied Table	Table	*	*	implied:Table
1476	Borrowings [abstract]	Abstract			ifrs-full:BorrowingsAbstract
1477	Credit loans due within one year - Short term bank loans	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
1478	42211 - Disclosure - Financial Assets and Financial Liabilities (Borrowings, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesBorrowingsNarrativeDetails
1479	Disclosure of detailed information about borrowings [table]	Table	*	*	ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1480	Range [axis]	Axis			ifrs-full:RangeAxis
1481	Ranges [member]	Member			ifrs-full:RangesMember
1482	Weighted average [member]	Member			ifrs-full:WeightedAverageMember
1483	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1484	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1485	Later than one year [member]	Member			ifrs-full:LaterThanOneYearMember
1486	Disclosure of detailed information about borrowings [line items]	LineItems			ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1487	Weighted average interest rate for the Group's borrowings	Concept (Percent)	As Of		ifrs-full:BorrowingsInterestRate
1488	Credit facilities with several PRC financial institutions	Concept (Monetary)	As Of	Credit	shi:MaximumCreditFacility
1489	Unused credit facilities	Concept (Monetary)	As Of	Credit	ifrs-full:UndrawnBorrowingFacilities
1490	42212 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Payables) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherPayablesDetails
1491	Implied Table	Table	*	*	implied:Table
1492	Trade and other payables [abstract]	Abstract			ifrs-full:TradeAndOtherPayablesAbstract
1493	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1494	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1495	Subtotal	Concept (Monetary)	As Of	Credit	shi:TradePayablesBillsPayableAndAmountsDueToRelatedParties
1496	Staff salaries and welfares payable	Concept (Monetary)	As Of	Credit	shi:StaffSalariesAndWelfaresPayable
1497	Taxes payable (exclude income tax payable)	Concept (Monetary)	As Of	Credit	shi:TaxesPayableOtherThanIncomeTaxPayable
1498	Interest payable	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentInterestPayable
1499	Dividends payable	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentDividendPayables
1500	Construction payable	Concept (Monetary)	As Of	Credit	shi:ConstructionPayable
1501	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentLiabilities
1502	Subtotal of other payables	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentPayables
1503	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
1504	42213 - Disclosure - Financial Assets and Financial Liabilities (Trade and Other Payables, Aging Analysis of Trade Payables) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/FinancialAssetsAndFinancialLiabilitiesTradeAndOtherPayablesAgingAnalysisOfTradePayablesDetails
1505	Trade and other payables [table]	Table	*	*	shi:TradeAndOtherPayablesTable
1506	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1507	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1508	Within one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
1509	Between one and two years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1510	Over two years [member]	Member			shi:LaterThanTwoYearsMember
1511	Trade and other payables [line items]	LineItems			shi:TradeAndOtherPayablesLineItems
1512	Trade payables (including bills payable and amounts due to related parties with trading nature)	Concept (Monetary)	As Of	Credit	shi:TradePayablesBillsPayableAndAmountsDueToRelatedParties
1513	42301 - Disclosure - Other assets and assets classified as held for sale (Details)	Network	*	*	http://www.spc-ir.com.hk/role/OtherAssetsAndAssetsClassifiedAsHeldForSaleDetails
1514	Implied Table	Table	*	*	implied:Table
1515	Other assets and assets classified as held for sale [abstract]	Abstract			ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwnersAbstract
1516	Prepayments	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepayments
1517	Prepayments to related parties	Concept (Monetary)	As Of	Debit	shi:PrepaymentsToRelatedParties
1518	Total other current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepaymentsAndOtherCurrentAssets
1519	Assets classified as held for sale	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
1520	42401 - Disclosure - Deferred Income (Details)	Network	*	*	http://www.spc-ir.com.hk/role/DeferredIncomeDetails
1521	Disclosure of deferred Income [table]	Table	*	*	shi:DisclosureOfDeferredIncomeTable
1522	Project [axis]	Axis			shi:ProjectAxis
1523	Project [member]	Member			shi:ProjectMember
1524	The project of energy efficiency renovations of thermoelectric unit [member]	Member			shi:TheProjectOfEnergyEfficiencyRenovationsOfThermoelectricUnitMember
1525	The project of relocation of pipeline in Huanggutang [member]	Member			shi:TheProjectOfRelocationOfPipelineInHuanggutangMember
1526	Deferred income [line items]	LineItems			shi:DeferredIncomeLineItems
1527	As at 1 January	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncome
1528	Government grants received during the year to compensate the cost	Concept (Monetary)	For Period	Credit	shi:IncreaseDecreaseInDeferredIncomeGovernmentGrantsReceivedToCompensateCost
1529	Amortization	Concept (Monetary)	For Period	Debit	shi:AmortizationOfGovernmentGrantsRelatingToPurchaseOfPropertyPlantAndEquipment
1530	As at 31 December	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncome
1531	42501 - Disclosure - Share Capital (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ShareCapitalDetails
1532	Disclosure of classes of share capital [table]	Table	*	*	ifrs-full:DisclosureOfClassesOfShareCapitalTable
1533	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1534	Equity [member]	Member			ifrs-full:EquityMember
1535	Ordinary A shares listed in PRC [member]	Member			shi:OrdinaryASharesListedInPRCMember
1536	Foreign invested H shares listed overseas [member]	Member			shi:ForeignInvestedHSharesListedOverseasMember
1537	Total [member]	Member			ifrs-full:IssuedCapitalMember
1538	Disclosure of classes of share capital [line items]	LineItems			ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1539	As at 1 January	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
1540	Exercise of employee share options - proceeds received	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
1541	As at 31 December	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
1542	42601 - Disclosure - Reserves (Details)	Network	*	*	http://www.spc-ir.com.hk/role/ReservesDetails
1543	Disclosure of reserves within equity [table]	Table	*	*	ifrs-full:DisclosureOfReservesWithinEquityTable
1544	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1545	Equity [member]	Member			ifrs-full:EquityMember
1546	Legal surplus [member]	Member			ifrs-full:StatutoryReserveMember
1547	Capital surplus [member]	Member			ifrs-full:CapitalReserveMember
1548	Surplus reserve [member]	Member			ifrs-full:ReserveOfDiscretionaryParticipationFeaturesMember
1549	Other reserve [member]	Member			ifrs-full:MiscellaneousOtherReservesMember
1550	Share premium [member]	Member			ifrs-full:SharePremiumMember
1551	Safety production fund [member]	Member			shi:SafetyProductionFundMember
1552	Retained earnings [member]	Member			ifrs-full:RetainedEarningsMember
1553	Total [member]	Member			shi:ReservesMember
1554	Disclosure of reserves within equity [line items]	LineItems			ifrs-full:DisclosureOfReservesWithinEquityLineItems
1555	Balance at 1 January	Concept (Monetary)	As Of	Credit	shi:Reserves
1556	Net profit attributable to shareholders of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1557	Dividends proposed and approved	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
1558	Utilization of safety production fund	Concept (Monetary)	For Period	Credit	shi:IncreaseDecreaseThroughUtilisationOfSafetyProductionFund
1559	Forfeit of share option scheme	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughForfeitOfShareOptionScheme
1560	Share option scheme	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
1561	Exercise of share option	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
1562	Share of other comprehensive loss of investments accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1563	Transactions with non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughChangeInEquityOfSubsidiaries
1564	Balance at 31 December	Concept (Monetary)	As Of	Credit	shi:Reserves
1565	42701 - Disclosure - Share-based Payments (General Information and Conditions of Share-Based Payment Arrangement, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPaymentsGeneralInformationAndConditionsOfSharebasedPaymentArrangementNarrativeDetails
1566	Disclosure of terms and conditions of share-based payment arrangement [table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1567	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1568	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1569	Share option incentive scheme [member]	Member			shi:ShareOptionIncentiveSchemeMember
1570	Tranche 1 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheOneMember
1571	Tranche 2 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheTwoMember
1572	Tranche 3 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheThreeMember
1573	Vesting condition [axis]	Axis			shi:VestingConditionAxis
1574	Vesting condition [member]	Member			shi:VestingConditionMember
1575	Vesting condition one [member]	Member			shi:VestingConditionOneMember
1576	Vesting condition two [member]	Member			shi:VestingConditionTwoMember
1577	Vesting condition three [member]	Member			shi:VestingConditionThreeMember
1578	Vesting condition four [member]	Member			shi:VestingConditionFourMember
1579	Vesting condition five [member]	Member			shi:VestingConditionFiveMember
1580	Disclosure of terms and conditions of share-based payment arrangement [line items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1581	Grant date of share options	Concept (Text/String)	For Period		ifrs-full:DateOfGrantOfSharebasedPaymentArrangement
1582	Number of share options granted	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1583	Number of participants	Concept (Integer)	For Period		shi:NumberOfParticipantsInShareBasedPaymentArrangement
1584	Percentage of ordinary shares granted to total ordinary share capital issued	Concept (Percent)	For Period		shi:PercentageOfOrdinarySharesGrantedToTotalOrdinaryShareCapitalIssued
1585	Number of tranches of share options	Concept (Decimal)	For Period		shi:NumberOfTranchesOfShareOptions
1586	Percentage of share options granted divided by three tranches	Concept (Percent)	For Period		shi:PercentageOfShareOptionsEachTrancheTake
1587	Vesting conditions of share options	Concept (Text/String)	For Period		ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
1588	Exercise price of each option at the grant date	Concept (Monetary)	For Period		ifrs-full:ExercisePriceShareOptionsGranted
1589	Total fair value of share options at the grant date	Concept (Monetary)	As Of	Debit	shi:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
1590	42702 - Disclosure - Share-based Payments (Significant Inputs into Option Price Model) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPaymentsSignificantInputsIntoOptionPriceModelDetails
1591	Disclosure of significant inputs into option price model [table]	Table	*	*	shi:DisclosureOfSignificantInputsIntoOptionPriceModelTable
1592	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1593	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1594	Share option incentive scheme [member]	Member			shi:ShareOptionIncentiveSchemeMember
1595	Range [axis]	Axis			ifrs-full:RangeAxis
1596	Ranges [member]	Member			ifrs-full:RangesMember
1597	Bottom of range [member]	Member			ifrs-full:BottomOfRangeMember
1598	Top of range [member]	Member			ifrs-full:TopOfRangeMember
1599	Disclosure of significant inputs into option price model [line items]	LineItems			shi:DisclosureOfSignificantInputsIntoOptionPriceModelLineItems
1600	Spot share price	Concept (Share)	For Period		shi:SpotSharePrice
1601	Exercise price	Concept (Monetary)	For Period		ifrs-full:ExercisePriceShareOptionsGranted
1602	Expected volatility	Concept (Percent)	For Period		ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
1603	Maturity (years)	Concept (Decimal)	For Period		ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1604	Risk-free interest rate	Concept (Percent)	For Period		ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1605	Dividend yield	Concept (Percent)	For Period		ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
1606	42703 - Disclosure - Share-based Payments (Summary Information of Outstanding Share Options, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPaymentsSummaryInformationOfOutstandingShareOptionsNarrativeDetails
1607	Disclosure of terms and conditions of share-based payment arrangement [table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1608	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1609	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1610	Share option incentive scheme [member]	Member			shi:ShareOptionIncentiveSchemeMember
1611	Tranche 1 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheOneMember
1612	Tranche 2 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheTwoMember
1613	Tranche 3 [member]	Member			shi:ShareBasedPaymentArrangementsTrancheThreeMember
1614	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1615	Equity [member]	Member			ifrs-full:EquityMember
1616	Share capital [member]	Member			ifrs-full:IssuedCapitalMember
1617	Share premium [member]	Member			ifrs-full:SharePremiumMember
1618	Disclosure of terms and conditions of share-based payment arrangement [line items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1619	Exercise price of each tranche option	Concept (Monetary)	As Of		ifrs-full:ExercisePriceOfOutstandingShareOptions
1620	Proceeds from exercising share option scheme	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromExerciseOfOptions
1621	Number of grantees	Concept (Integer)	For Period		shi:ExerciseOfShareOptionNumberOfGrantees
1622	Weighted average share price at the date of exercise of options exercised	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1623	Share option expenses reverse due to forfeit of share option scheme	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForSharebasedPayments
1624	Share option expenses recognized	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1625	42704 - Disclosure - Share-based Payments (Summaries of Options Granted) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SharebasedPaymentsSummariesOfOptionsGrantedDetails
1626	Disclosure of terms and conditions of share-based payment arrangement [table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1627	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1628	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1629	Share option incentive scheme [member]	Member			shi:ShareOptionIncentiveSchemeMember
1630	Disclosure of terms and conditions of share-based payment arrangement [line items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1631	As at 1 January	Concept (Decimal)	As Of		shi:AccumulatedNumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1632	Exercised during the year	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1633	Forfeited during the year	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1634	As at 31 December	Concept (Decimal)	As Of		shi:AccumulatedNumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1635	42801 - Disclosure - Related Party Transactions (List of Major Related Parties) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsListOfMajorRelatedPartiesDetails
1636	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1637	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1638	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1639	Sinopec Group [member]	Member			shi:ChinaPetrochemicalCorporationMember
1640	JYJC [member]	Member			shi:ShanghaiPetrochemicalPressureVesselTestingCenterMember
1641	BOC [member]	Member			shi:BOCSPCGasesCompanyLimitedMember
1642	Jinpu [member]	Member			shi:ShanghaiJinpuPlasticPackingMaterialsCompanyLimitedMember
1643	Yangu Gas [member]	Member			shi:ShanghaiPetrochemicalYanguGasDevelopmentCompanyLimitedMember
1644	Shanghai Secco [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1645	Chemical Industry [member]	Member			shi:ShanghaiChemicalIndustryParkDevelopmentCompanyLimitedMember
1646	Jinsen [member]	Member			shi:ShanghaiJinsenHydrocarbonResinsCompanyLimitedMember
1647	Azbil [member]	Member			shi:ShanghaiAzbilAutomationCompanyLimitedMember
1648	Shanghai Nam Kwong Petro-Chemical Company Limited [member]	Member			shi:ShanghaiNamKwongPetroChemicalCompanyLimitedMember
1649	Shanghai Jinhuan Petroleum Naphthalene Development Company Limited [member]	Member			shi:ShanghaiJinhuanPetroleumNaphthaleneDevelopmentCompanyLimitedMember
1650	Shanghai Chemical Industry Park Logistics Company Limited [member]	Member			shi:ShanghaiChemicalIndustryParkLogisticsCompanyLimitedMember
1651	Sinopec Chemical Commercial Holding Company Limited [member]	Member			shi:SinopecChemicalCommercialHoldingCompanyLimitedMember
1652	Sinopec Sales Company Limited [member]	Member			shi:SinopecSalesCompanyLimitedMember
1653	Sinopec Yizheng Chemical Fibre Company Limited [member]	Member			shi:SinopecYizhengChemicalFibreCompanyLimitedMember
1654	China International United Petroleum and Chemical Company Limited [member]	Member			shi:ChinaInternationalUnitedPetroleumAndChemicalCompanyLimitedMember
1655	China Petrochemical International Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalCompanyLimitedMember
1656	Sinopec Refinery Product Sales Company Limited [member]	Member			shi:SinopecRefineryProductSalesCompanyLimitedMember
1657	Sinopec Yangzi Petrochemical Company Limited [member]	Member			shi:SinopecYangziPetrochemicalCompanyLimitedMember
1658	China Petrochemical International Beijing Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalBeijingCompanyLimitedMember
1659	China Petrochemical International Ningbo Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalNingboCompanyLimitedMember
1660	China Petrochemical International Tianjin Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalTianjinCompanyLimitedMember
1661	China Petrochemical International Russia Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalRussiaCompanyLimitedMember
1662	Sinopec Europe Company Limited [member]	Member			shi:SinopecEuropeCompanyLimitedMember
1663	China and South Korea (Wuhan) petrochemical Company Limited [member]	Member			shi:ChinaAndSouthKoreaWuhanPetrochemicalCompanyLimitedMember
1664	Sinopec USA Company Limited [member]	Member			shi:SinopecUSACompanyLimitedMember
1665	Sinopec Chemical Commercial Holding (Hong Kong) Company Limited [member]	Member			shi:SinopecChemicalCommercialHoldingHongkongCompanyLimitedMember
1666	Sinopec Huadong Supplies and Equipment Company Limited [member]	Member			shi:SinopecHuadongSuppliesAndEquipmentCompanyLimitedMember
1667	Petro-Cyber Works Information Technology Company Limited [member]	Member			shi:PetroCyberworksInformationTechnologyCompanyLimitedMember
1668	Sinopec Fuel Oil Sales Corporation Limited [member]	Member			shi:SinopecFuelOilSalesCorporationLimitedMember
1669	Sinopec Catalyst Co.,Ltd [member]	Member			shi:SinopecCatalystCompanyLimitedMember
1670	Sinopec lubricating oil Co., Ltd [member]	Member			shi:SinopeclubricatingoilCompanyLimitedMember
1671	Nanjing Yangzi Petrochemical Rubber Co.,Ltd [member]	Member			shi:NanjingYangziPetrochemicalRubberCompanyLimitedMember
1672	Nantong Donghai Petrochemical Corporation Co.,Ltd [member]	Member			shi:NantongDonghaiPetrochemicalCorporationCompanyLimitedMember
1673	Dalian Frip Science and Technology Co.,Ltd [member]	Member			shi:DalianFripScienceandTechnologyCompanyLimitedMember
1674	Ningbo Zhenhai District Donghai Refinery Hotel Co., Ltd [member]	Member			shi:NingboZhenhaiDistrictDonghaiRefineryHotelCompanyLimitedMember
1675	Sinopec Fujian Petrochemical Company Limited [member]	Member			shi:SinopecFujianPetrochemicalCompanyLimitedMember
1676	Sinopec Corp. Maoming Nan Hai Fine Chemical Co.,Ltd [member]	Member			shi:SinopecCorporationMaomingNanHaiFineChemicalCompanyLimitedMember
1677	BASF-YPC Company Limited [member]	Member			shi:BASFYPCCompanyLimitedMember
1678	Zhejiang Baling Hengyi Caprolactam Limited Company [member]	Member			shi:ZhejiangBalingHengyiCaprolactamLimitedCompanyMember
1679	Sinopec Petroleum Storage and Reserve Limited [member]	Member			shi:SinopecPetroleumStorageAndReserveLimitedMember
1680	Sinopec Assets Management Corporation [member]	Member			shi:SinopecAssetsManagementCorporationMember
1681	Shanghai Petrochemical Machinery Manufacturing Co., Ltd [member]	Member			shi:ShanghaiPetrochemicalMachineManufacturingCompanyLimitedMember
1682	Shanghai Petrochemical Seawall Management Office [member]	Member			shi:ShanghaiPetrochemicalSeawallManagementOfficeMember
1683	China Petrochemical Press Co., Ltd [member]	Member			shi:ChinaPetrochemicalPressCompanyLimitedMember
1684	China Petrochemical News [member]	Member			shi:ChinaPetrochemicalNewsMember
1685	Sinopec Shared Services Co.Ltd. [member]	Member			shi:SinopecSharedServicesCompanyLimitedMember
1686	Sinopec group Beijing Yanshan Petrochemical Co., Ltd. [member]	Member			shi:SinopecgroupBeijingYanshanPetrochemicalCompanyLimitedMember
1687	Sinopec Tendering Co., Ltd. [member]	Member			shi:SinopecTenderingCompanyLimitedMember
1688	Sinopec Petroleum Commercial Reserve Co., Ltd [member]	Member			shi:SinopecPetroleumCommercialReserveCompanyLimitedMember
1689	Sinopec Shengli Petroleum Administration Company Limited [member]	Member			shi:SinopecShengliPetroleumAdministrationCompanyLimitedMember
1690	Sinopec Nanjing Engineering Company Limited [member]	Member			shi:SinopecNanjingEngineeringCompanyLimitedMember
1691	China Petrochemical International Wuhan Company Limited [member]	Member			shi:ChinaPetrochemicalInternationalWuhanCompanyLimitedMember
1692	Sinopec Engineering Quality Monitoring Company Limited [member]	Member			shi:SinopecEngineeringQualityMonitoringCompanyLimitedMember
1693	Sinopec Engineering Cost Company Limited [member]	Member			shi:SinopecEngineeringCostCompanyLimitedMember
1694	Sinopec Luoyang Engineering Company Limited [member]	Member			shi:SinopecLuoyangEngineeringCompanyLimitedMember
1695	Sinopec energy saving technology service company limited [member]	Member			shi:SinopecenergysavingtechnologyservicecompanylimitedMember
1696	Beijing Petrochemical Engineering Consulting Company Limited [member]	Member			shi:BeijingPetrochemicalEngineeringConsultingCompanyLimitedMember
1697	Beijing Victory Hotel Company Limited [member]	Member			shi:BeijingVictoryHotelCompanyLimitedMember
1698	National petrochemical project risk assessment technology center [member]	Member			shi:NationalpetrochemicalprojectriskassessmenttechnologycenterMember
1699	Sinopec Material & Equipment (Dalian) Company Limited [member]	Member			shi:SinopecMaterialEquipmentDalianCompanyLimitedMember
1700	Storage and transportation installation company of Ningbo engineering co., LTD. [member]	Member			shi:StorageandtransportationinstallationcompanyofNingboengineeringCompanyLimitedMember
1701	Petrochemical Engineering Quality Supervision Centre [member]	Member			shi:PetrochemicalEngineeringQualitySupervisionCentreMember
1702	Sinopec Management Institute [member]	Member			shi:SinopecManagementInstituteMember
1703	Sinopec Shanghai Engineering Company Limited [member]	Member			shi:SinopecShanghaiEngineeringCompanyLimitedMember
1704	The Fourth Construction Company of Sinopec [member]	Member			shi:TheFourthConstructionCompanyOfSinopecMember
1705	The Fifth Construction Company of Sinopec [member]	Member			shi:TheFifthConstructionCompanyOfSinopecMember
1706	The Tenth Construction Company of Sinopec [member]	Member			shi:TheTenthConstructionCompanyOfSinopecMember
1707	Sinopec Engineering Incorporation [member]	Member			shi:SinopecEngineeringIncorporationMember
1708	Sinopec Ningbo Engineering Company Limited [member]	Member			shi:SinopecNingboEngineeringCompanyLimitedMember
1709	Sinopec Finance Company Limited ("Sinopec Finance") [member]	Member			shi:SinopecFinanceCompanyLimitedMember
1710	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1711	Relationship with the Company	Concept (Text/String)	For Period		ifrs-full:DescriptionOfNatureOfRelatedPartyRelationship
1712	42802 - Disclosure - Related Party Transactions (Transactions between the Group and Sinopec Corp., Its Subsidiaries and Joint Ventures) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsTransactionsBetweenTheGroupAndSinopecCorpItsSubsidiariesAndJointVenturesDetails
1713	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1714	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1715	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1716	Sinopec Corp., its subsidiaries and joint ventures [member]	Member			shi:SinopecCorpWithSubsidiariesAndJointVenturesMember
1717	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1718	Sales of petroleum products	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromSaleOfPetroleumAndPetrochemicalProducts
1719	Sales other than petroleum products	Concept (Monetary)	For Period	Credit	shi:RevenueFromSaleOfOtherThanPetroleumAndPetrochemicalProducts
1720	Purchases of crude oil	Concept (Monetary)	For Period	Debit	shi:PurchasesOfCrudeOil
1721	Purchases other than crude oil	Concept (Monetary)	For Period	Debit	shi:PurchasesOtherThanCrudeOil
1722	Sales commissions	Concept (Monetary)	For Period	Debit	ifrs-full:FeeAndCommissionExpense
1723	Rental income	Concept (Monetary)	For Period	Credit	ifrs-full:RentalIncome
1724	42803 - Disclosure - Related Party Transactions (Other Transactions between the Group and Sinopec Group and Its Subsidiaries, Associates and Joint Ventures of the Group) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsOtherTransactionsBetweenTheGroupAndSinopecGroupAndItsSubsidiariesAssociatesAndJointVenturesOfTheGroupDetails
1725	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1726	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1727	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1728	Sinopec Group and its subsidiaries [member]	Member			shi:SinopecGroupAndSubsidiariesMember
1729	Associates and joint ventures of the Group [member]	Member			shi:AssociatesAndJointVenturesMember
1730	Sinopec Finance [member]	Member			shi:SinopecFinanceCompanyLimitedMember
1731	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1732	Sales of goods and service fee income	Concept (Monetary)	For Period	Credit	shi:RevenueFromSalesOfGoodsAndServiceFeeRelatedPartyTransactions
1733	Purchase	Concept (Monetary)	For Period	Debit	shi:PurchaseRelatedPartyTransaction
1734	Insurance premiums expenses	Concept (Monetary)	For Period	Debit	ifrs-full:InsuranceExpense
1735	Lease expenses	Concept (Monetary)	For Period		ifrs-full:LeasesAsLesseeRelatedPartyTransactions
1736	Loans borrowed	Concept (Monetary)	For Period	Debit	ifrs-full:CashAdvancesAndLoansFromRelatedParties
1737	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromInterest
1738	Loans repayment	Concept (Monetary)	For Period	Credit	ifrs-full:CashRepaymentsOfAdvancesAndLoansFromRelatedParties
1739	Interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:InterestExpense
1740	Construction and installation cost	Concept (Monetary)	For Period	Debit	shi:ConstructionAndInstallationCostRelatedPartyTransactions
1741	42804 - Disclosure - Related Party Transactions (Relevant Amounts Due from/to Related Parties) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsRelevantAmountsDueFromtoRelatedPartiesDetails
1742	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1743	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1744	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1745	Sinopec Corp., its subsidiaries and joint ventures [member]	Member			shi:SinopecCorpWithSubsidiariesAndJointVenturesMember
1746	Sinopec Group and its subsidiaries [member]	Member			shi:SinopecGroupAndSubsidiariesMember
1747	Associates and joint ventures of the Group [member]	Member			shi:AssociatesAndJointVenturesMember
1748	Sinopec Finance Company Limited ("Sinopec Finance") [member]	Member			shi:SinopecFinanceCompanyLimitedMember
1749	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1750	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1751	Not later than three months [member]	Member			ifrs-full:NotLaterThanThreeMonthsMember
1752	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1753	Amounts due from related parties	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
1754	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1755	Cash deposits, maturing within 3 months	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
1756	Cash deposits interest rate	Concept (Percent)	As Of		shi:CashDepositsInterestRate
1757	42805 - Disclosure - Related Party Transactions (Key Personnel Compensations) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsKeyPersonnelCompensationsDetails
1758	Implied Table	Table	*	*	implied:Table
1759	Related party transactions [abstract]	Abstract			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
1760	Short-term employee benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1761	Post-employment benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
1762	Share-based payments	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1763	Total	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensation
1764	42806 - Disclosure - Related Party Transactions (Contributions to Defined Contribution Retirement Plans) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsContributionsToDefinedContributionRetirementPlansDetails
1765	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1766	Defined contribution plans [axis]	Axis			shi:DefinedContributionPlansAxis
1767	Defined contribution plans [member]	Member			shi:DefinedContributionPlansMember
1768	Municipal contribution plan [member]	Member			shi:MunicipalContributionPlanMember
1769	Supplementary contribution plan [member]	Member			shi:SupplementaryContributionPlanMember
1770	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1771	Contributions to defined contribution retirement plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
1772	42807 - Disclosure - Related Party Transactions (Commitments with Related Parties) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsCommitmentsWithRelatedPartiesDetails
1773	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1774	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1775	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1776	Sinopec Group and its subsidiaries [member]	Member			shi:SinopecGroupAndSubsidiariesMember
1777	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1778	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1779	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
1780	Later than one year and not later than two years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1781	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1782	Construction and installation cost	Concept (Monetary)	As Of	Credit	shi:ConstructionAndInstallationCostCommitmentsRelatedPartyTransactions
1783	Operating lease commitments	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1784	42808 - Disclosure - Related Party Transactions (Investment Commitments with Related Parties) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsInvestmentCommitmentsWithRelatedPartiesDetails
1785	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1786	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1787	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1788	Shanghai Secco Petrochemical Company Limited [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1789	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1790	Capital contribution to Shanghai Secco	Concept (Monetary)	As Of	Credit	ifrs-full:ContractualCapitalCommitments
1791	42809 - Disclosure - Related Party Transactions (Investment Commitments with Related Parties, Narrative) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/RelatedPartyTransactionsInvestmentCommitmentsWithRelatedPartiesNarrativeDetails
1792	Disclosure of transactions between related parties [table]	Table	*	*	ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1793	Consolidated and separate financial statements [axis]	Axis			ifrs-full:ConsolidatedAndSeparateFinancialStatementsAxis
1794	Consolidated [member]	Member			ifrs-full:ConsolidatedMember
1795	Parent [member]	Member			ifrs-full:ParentMember
1796	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1797	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1798	Shanghai Secco Petrochemical Company Limited [member]	Member			shi:ShanghaiSeccoPetrochemicalCompanyLimitedMember
1799	Disclosure of transactions between related parties [line items]	LineItems			ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1800	Capital contribution to Shanghai Secco	Concept (Monetary)	As Of	Credit	ifrs-full:ContractualCapitalCommitments
1801	Capital contribution paid to Shanghai Secco	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
1802	Expiration period of capital contribution plan	Concept (xbrli:durationItemType)	For Period		shi:ExpirationPeriodOfCapitalContributionPlan
1803	42901 - Disclosure - Dividend (Details)	Network	*	*	http://www.spc-ir.com.hk/role/DividendDetails
1804	Implied Table	Table	*	*	implied:Table
1805	Dividend [abstract]	Abstract			shi:DividendAbstract
1806	Approved dividend not reflected in financial statement, per share	Concept (Share)	For Period		ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
1807	Approved dividend not reflected in financial statement, amount	Concept (Monetary)	For Period		ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners
1808	Approved dividend, per share	Concept (Share)	For Period		ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
1809	Approved dividend, amount	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
1810	43001 - Disclosure - Cash Generated from Operations (Reconciliation of Profit before Taxation to Cash Used in Operation) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperationsReconciliationOfProfitBeforeTaxationToCashUsedInOperationDetails
1811	Implied Table	Table	*	*	implied:Table
1812	Cash generated from operations [abstract]	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
1813	Profit before income tax	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
1814	Adjustment items:	Abstract			ifrs-full:AdjustmentsForReconcileProfitLossAbstract
1815	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForInterestIncome
1816	Share of profit of investments accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod
1817	Gains on disposal of joint venture	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnDisposalsOfInvestmentsInJointVentures
1818	Gains on disposal of subsidiary	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesRecognisedWhenControlInSubsidiaryIsLost
1819	Fair value losses of foreign exchange option and forward exchange contracts	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
1820	Gains from structured deposits	Concept (Monetary)	For Period	Credit	shi:GainsLossesFromStructuredDeposits
1821	Interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForInterestExpense
1822	Foreign exchange (gain)/loss	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
1823	Depreciation of property, plant and equipment	Concept (Monetary)	For Period		ifrs-full:DepreciationPropertyPlantAndEquipment
1824	Depreciation of investment property	Concept (Monetary)	For Period		ifrs-full:DepreciationInvestmentProperty
1825	Amortization of lease prepayments and other non-current assets	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForAmortisationExpense
1826	Impairment loss on property, plant, equipment and construction in progress	Concept (Monetary)	For Period	Debit	shi:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantEquipmentAndConstructionInProgress
1827	Losses/(gains) on disposal of property, plant and equipment-net	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
1828	Option premium of foreign exchange option	Concept (Monetary)	For Period	Debit	shi:AdjustmentForOptionPremiumOfForeignExchangeOption
1829	Gains on exercise of foreign exchange option	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnExerciseOfForeignExchangeOption
1830	Net gains on settlement of foreign exchange contracts	Concept (Monetary)	For Period	Credit	shi:GainsLossesOnSettlementOfForeignExchangeContract
1831	Share-based payment	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForSharebasedPayments
1832	Government grant relating to disposal of property, plant and equipment	Concept (Monetary)	For Period	Credit	shi:AdjustmentsForGovernmentGrantRelatingToDisposalOfPropertyPlantAndEquipment
1833	Profit on operation before change of working capital	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
1834	Increase in inventories	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
1835	Increase in operation receivables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
1836	Increase in operation payables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
1837	Increase in balances to related parties-net	Concept (Monetary)	For Period	Debit	shi:AdjustmentsForDecreaseIncreaseInBalancesToRelatedPartiesNet
1838	Cash generated from operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperations
1839	43002 - Disclosure - Cash Generated from Operations (Reconciliation of Liabilities Arising from Financing Activities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperationsReconciliationOfLiabilitiesArisingFromFinancingActivitiesDetails
1840	Disclosure of reconciliation of liabilities arising from financing activities [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1841	Liabilities arising from financing activities [axis]	Axis			ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1842	Liabilities arising from financing activities [member]	Member			ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1843	Bank loans [member]	Member			ifrs-full:ShorttermBorrowingsMember
1844	Disclosure of reconciliation of liabilities arising from financing activities [line items]	LineItems			ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1845	Begining balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1846	Financing cash flows	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1847	Foreign exchange movements	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
1848	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1849	43003 - Disclosure - Cash Generated from Operations (Proceeds from Sale of Property, Plant and Equipment) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperationsProceedsFromSaleOfPropertyPlantAndEquipmentDetails
1850	Implied Table	Table	*	*	implied:Table
1851	Cash generated from operations [abstract]	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
1852	Net book amount	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsPropertyPlantAndEquipment
1853	(Losses)/ gains on disposal of property, plant and equipment-net	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
1854	Government grant relating to disposal of property, plant and equipment	Concept (Monetary)	For Period	Credit	shi:AdjustmentsForGovernmentGrantRelatingToDisposalOfPropertyPlantAndEquipment
1855	Increase in other payables	Concept (Monetary)	For Period	Credit	shi:IncreaseDecreaseInOtherPayablesRelatedToDisposalOfPropertyPlantAndEquipment
1856	Net proceeds from disposal of property, plant and equipment	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
1857	43004 - Disclosure - Cash Generated from Operations (Non-cash Investing Activities) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CashGeneratedFromOperationsNoncashInvestingActivitiesDetails
1858	Implied Table	Table	*	*	implied:Table
1859	Cash generated from operations [abstract]	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
1860	Purchase of non-current assets settled by bills	Concept (Monetary)	For Period	Credit	shi:PurchaseOfNoncurrentAssetsSettledByBills
1861	43101 - Disclosure - Commitments (Capital Commitments) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CommitmentsCapitalCommitmentsDetails
1862	Implied Table	Table	*	*	implied:Table
1863	Capital Commitments [abstract]	Abstract			ifrs-full:CapitalCommitmentsAbstract
1864	Property, plant and equipment	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
1865	Contracted but not provided for	Concept (Monetary)	As Of	Credit	ifrs-full:ContractualCapitalCommitments
1866	43102 - Disclosure - Commitments (Maturity Analysis of Operating Lease Commitments) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/CommitmentsMaturityAnalysisOfOperatingLeaseCommitmentsDetails
1867	Operating lease commitments lessee [table]	Table	*	*	ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable
1868	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1869	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1870	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
1871	Later than one year and not later than two years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1872	Later than two years and not later than three years [member]	Member			ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1873	Later than three years [member]	Member			ifrs-full:LaterThanThreeYearsMember
1874	Operating lease commitments lessee [line items]	LineItems			ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems
1875	Future aggregate minimum lease payments under non-cancellable operating leases	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1876	43201 - Disclosure - Subsequent Event (Details)	Network	*	*	http://www.spc-ir.com.hk/role/SubsequentEventDetails
1877	Implied Table	Table	*	*	implied:Table
1878	Subsequent event [abstract]	Abstract			shi:SubsequentEventAbstract
1879	Proposed dividend, per share	Concept (Share)	For Period		ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
1880	Proposed dividend, amount	Concept (Monetary)	For Period		ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners
1881	43301 - Disclosure - Balance Sheet and Reserve Movement of the Company (Balance Sheet) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/BalanceSheetAndReserveMovementOfTheCompanyBalanceSheetDetails
1882	Statement of balance sheet [table]	Table	*	*	shi:StatementOfBalanceSheetTable
1883	Consolidated and separate financial statements [axis]	Axis			ifrs-full:ConsolidatedAndSeparateFinancialStatementsAxis
1884	Consolidated [member]	Member			ifrs-full:ConsolidatedMember
1885	The Company [member]	Member			ifrs-full:ParentMember
1886	Statement of balance sheet [line items]	LineItems			shi:StatementOfBalanceSheetLineItems
1887	Assets	Abstract			ifrs-full:AssetsAbstract
1888	Non-current assets	Abstract			ifrs-full:NoncurrentAssetsAbstract
1889	Lease prepayments and other non-current assets	Concept (Monetary)	As Of	Debit	shi:NoncurrentLeasePrepaymentsAndOtherAssets
1890	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1891	Investment properties	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentProperty
1892	Construction in progress	Concept (Monetary)	As Of	Debit	ifrs-full:ConstructionInProgress
1893	Investments in subsidiaries	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiaries
1894	Investments accounted for using the equity method	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1895	Deferred income tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetDeferredTaxAssets
1896	Non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
1897	Current assets	Abstract			ifrs-full:CurrentAssetsAbstract
1898	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:Inventories
1899	Financial assets at fair value through other comprehensive income	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1900	Financial assets at fair value through profit or loss	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
1901	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
1902	Bills receivable	Concept (Monetary)	As Of	Debit	shi:BillsReceivables
1903	Other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
1904	Prepayments	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepayments
1905	Amounts due from related parties	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
1906	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1907	Time deposits with financial institutions	Concept (Monetary)	As Of	Debit	ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
1908	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
1909	Total assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
1910	Equity and liabilities	Abstract			ifrs-full:EquityAndLiabilitiesAbstract
1911	Share capital	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
1912	Reserves	Concept (Monetary)	As Of	Credit	shi:Reserves
1913	Equity attributable to owners of the Company	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAttributableToOwnersOfParent
1914	Liabilities	Abstract			ifrs-full:LiabilitiesAbstract
1915	Non-current liabilities	Abstract			ifrs-full:NoncurrentLiabilitiesAbstract
1916	Deferred income	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncomeClassifiedAsNoncurrent
1917	Current liabilities	Abstract			ifrs-full:CurrentLiabilitiesAbstract
1918	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
1919	Financial liabilities at fair value through profit or loss	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilitiesAtFairValueThroughProfitOrLoss
1920	Contract liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentContractLiabilities
1921	Advance from customers	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentAdvances
1922	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1923	Other payables	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentPayables
1924	Amounts due to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1925	Income tax payable	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentTaxLiabilities
1926	Current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
1927	Total liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
1928	Total equity and liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAndLiabilities
1929	43302 - Disclosure - Balance Sheet and Reserve Movement of the Company (Reserve Movement) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/BalanceSheetAndReserveMovementOfTheCompanyReserveMovementDetails
1930	Statement of changes in equity [table]	Table	*	*	ifrs-full:StatementOfChangesInEquityTable
1931	Consolidated and separate financial statements [axis]	Axis			ifrs-full:ConsolidatedAndSeparateFinancialStatementsAxis
1932	Consolidated [member]	Member			ifrs-full:ConsolidatedMember
1933	The Company [member]	Member			ifrs-full:ParentMember
1934	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1935	Equity [member]	Member			ifrs-full:EquityMember
1936	Legal surplus [member]	Member			ifrs-full:StatutoryReserveMember
1937	Capital surplus [member]	Member			ifrs-full:CapitalReserveMember
1938	Surplus reserve [member]	Member			ifrs-full:ReserveOfDiscretionaryParticipationFeaturesMember
1939	Other reserve [member]	Member			ifrs-full:MiscellaneousOtherReservesMember
1940	Share premium [member]	Member			ifrs-full:SharePremiumMember
1941	Safety production fund [member]	Member			shi:SafetyProductionFundMember
1942	Retained earnings [member]	Member			ifrs-full:RetainedEarningsMember
1943	Total [member]	Member			shi:ReservesMember
1944	Statement of changes in equity [line items]	LineItems			ifrs-full:StatementOfChangesInEquityLineItems
1945	Balance at 1 January	Concept (Monetary)	As Of	Credit	shi:Reserves
1946	Net profit attributable to shareholders of the Company	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1947	Dividends proposed and approved	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
1948	Utilization of safety production fund	Concept (Monetary)	For Period	Credit	shi:IncreaseDecreaseThroughUtilisationOfSafetyProductionFund
1949	Share option scheme	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
1950	Forfeit of share option scheme	Concept (Monetary)	For Period	Debit	shi:IncreaseDecreaseThroughForfeitOfShareOptionScheme
1951	Exercise of share option	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
1952	Share of other comprehensive loss of investments accounted for using the equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1953	Balance at 31 December	Concept (Monetary)	As Of	Credit	shi:Reserves
1954	43401 - Disclosure - Benefits and Interests of Directors (Directors' and Chief Executives' Emoluments) (Details)	Network	*	*	http://www.spc-ir.com.hk/role/BenefitsAndInterestsOfDirectorsDirectorsAndChiefExecutivesEmolumentsDetails
1955	Disclosure of benefits and interests of directors [table]	Table	*	*	shi:DisclosureOfBenefitsAndInterestsOfDirectorsTable
1956	Name of key management personnel [axis]	Axis			shi:NameOfKeyManagementPersonnelAxis
1957	Name of key management personnel [member]	Member			shi:NameOfKeyManagementPersonnelMember
1958	Wang Zhiqing [member]	Member			shi:WangZhiqingMember
1959	Gao Jinping [member]	Member			shi:GaoJinpingMember
1960	Ye Guohua [member]	Member			shi:YeGuohuaMember
1961	Jin Qiang [member]	Member			shi:JinQiangMember
1962	Wu Haijun [member]	Member			shi:WuHaijunMember
1963	Shi Wei [member]	Member			shi:ShiWeiMember
1964	Guo Xiaojun [member]	Member			shi:GuoXiaojunMember
1965	Zhou Meiyun [member]	Member			shi:ZhouMeiyunMember
1966	Jin Wenmin [member]	Member			shi:JinWenminMember
1967	Cai Tingji [member]	Member			shi:CaiTingjiMember
1968	Zhang Yimin [member]	Member			shi:ZhangYiminMember
1969	Liu Yunhong [member]	Member			shi:LiuYunhongMember
1970	Du Weifeng [member]	Member			shi:DuWeifengMember
1971	Kuang Yuxiang [member]	Member			shi:KuangYuxiangMember
1972	Zuo Qiang [member]	Member			shi:ZuoQiangMember
1973	Li Xiaoxia [member]	Member			shi:LiXiaoxiaMember
1974	Li Yuanqin [member]	Member			shi:LiYuanqinMember
1975	Pan Fei [member]	Member			shi:PanFeiMember
1976	Ma Yanhui [member]	Member			shi:MaYanhuiMember
1977	Zheng Yunrui [member]	Member			shi:ZhengYunruiMember
1978	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1979	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1980	Directors and chief executives [member]	Member			shi:DirectorsAndChiefExecutivesMember
1981	Executive Directors [member]	Member			shi:ExecutiveDirectorsMember
1982	Independent non-executive directors [member]	Member			shi:IndependentNonExecutiveDirectorsMember
1983	Supervisors [member]	Member			shi:SupervisorsMember
1984	Disclosure of benefits and interests of directors [line items]	LineItems			shi:DisclosureOfBenefitsAndInterestsOfDirectorsLineItems
1985	Salaries and other benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1986	Retirement scheme contributions	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
1987	Discretionary bonus	Concept (Monetary)	For Period	Debit	shi:KeyManagementPersonnelCompensationDiscretionaryBonus
1988	Share option	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1989	Total	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensation