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Subsequent Event (Details) - Risk Mitigation Proceeds $ in Millions | Jan. 01, 2019 CAD ($)
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Disclosure of non-adjusting events after reporting period [line items] |
Risk mitigation proceeds | $ 300
Risk mitigation, net of tax | $ 260

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from risk mitigation. + References No definition available. + Details
Name: | su_ProceedsFromRiskMitigation
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow from risk mitigation, net of tax + References No definition available. + Details
Name: | su_ProceedsFromRiskMitigationNetOfTax
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=su_RiskMitigationProceedsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |