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Supplementary Oil And Gas Information (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | $ 8,901 | $ 0 | $ 524
Unproved | 320 | 0 | 0
Exploration | 46 | 46 | 45
Development | 6,100 | 5,784 | 4,766
Costs incurred | 15,367 | 5,830 | 5,335
North America |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 8,901 | 0 | 524
Unproved | 320 | 0 | 0
Exploration | 102 | 43 | 40
Development | 5,543 | 5,039 | 4,387
Costs incurred | 14,866 | 5,082 | 4,951
North Sea |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 0 | 0 | 0
Unproved | 0 | 0 | 0
Exploration | 0 | 0 | 0
Development | 352 | 558 | 304
Costs incurred | 352 | 558 | 304
Offshore Africa |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 0 | 0 | 0
Unproved | 0 | 0 | 0
Exploration | (56) | 3 | 5
Development | 205 | 187 | 75
Costs incurred | $ 149 | $ 190 | $ 80

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