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Supplementary Oil And Gas Information (Unaudited) - Capitalized Costs Related to Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | $ 161,063 | $ 145,873 | $ 141,397
Unproved properties | 2,526 | 2,208 | 2,226
Capitalized costs, gross | 163,589 | 148,081 | 143,623
Net capitalized costs | 75,537 | 66,396 | 66,693
Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (88,052) | (81,685) | (76,930)
North America |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 146,309 | 132,858 | 128,807
Unproved properties | 2,478 | 2,108 | 2,128
Capitalized costs, gross | 148,787 | 134,966 | 130,935
Net capitalized costs | 74,012 | 65,021 | 65,388
North America | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (74,775) | (69,945) | (65,547)
North Sea |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 9,731 | 8,606 | 8,258
Unproved properties | 0 | 0 | 0
Capitalized costs, gross | 9,731 | 8,606 | 8,258
Net capitalized costs | 339 | 224 | 152
North Sea | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (9,392) | (8,382) | (8,106)
Offshore Africa |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 5,023 | 4,409 | 4,332
Unproved properties | 48 | 100 | 98
Capitalized costs, gross | 5,071 | 4,509 | 4,430
Net capitalized costs | 1,186 | 1,151 | 1,153
Offshore Africa | Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | $ (3,885) | $ (3,358) | $ (3,277)

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