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v3.24.1

Right-of-Use Assets and Leases - Other Lease Disclosures (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Right-of-Use Assets and Leases |  |
Leases with residual value guarantees | $ 0 | $ 0
Cash outflow for leases | $ 529 | $ 496

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_g&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_CashOutflowForLeases
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_PresentationOfLeasesForLesseeAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Information pertaining to lease liabilities with residual value guarantees. + References No definition available. + Details
Name: | su_LeaseLiabilitiesWithResidualValueGuarantees
Namespace Prefix: | su_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant