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Leases - Lease Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Information About Lease Assets Explanatory [Line Items] |  |
Lease assets, beginning balance | $ 1,447 | $ 1,508
Additions | 317 | 182
Depreciation | (273) | (244)
Foreign exchange and other | (33) | 1
Lease assets, ending balance | 1,458 | 1,447
Product transportation and storage |  |
Disclosure Of Information About Lease Assets Explanatory [Line Items] |  |
Lease assets, beginning balance | 912 | 974
Additions | 27 | 44
Depreciation | (98) | (106)
Foreign exchange and other | (1) | 0
Lease assets, ending balance | 840 | 912
Field equipment and power |  |
Disclosure Of Information About Lease Assets Explanatory [Line Items] |  |
Lease assets, beginning balance | 377 | 354
Additions | 218 | 110
Depreciation | (111) | (86)
Foreign exchange and other | (2) | (1)
Lease assets, ending balance | 482 | 377
Offshore vessels and equipment |  |
Disclosure Of Information About Lease Assets Explanatory [Line Items] |  |
Lease assets, beginning balance | 97 | 99
Additions | 49 | 28
Depreciation | (45) | (31)
Foreign exchange and other | (30) | 1
Lease assets, ending balance | 71 | 97
Office leases and other |  |
Disclosure Of Information About Lease Assets Explanatory [Line Items] |  |
Lease assets, beginning balance | 61 | 81
Additions | 23 | 0
Depreciation | (19) | (21)
Foreign exchange and other | 0 | 1
Lease assets, ending balance | $ 65 | $ 61

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- Definition Foreign Exchange Adjustments And Other, Right-Of-Use Assets + References No definition available. + Details
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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_h&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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