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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | $ 145,873 | $ 141,397 | $ 136,108
Unproved properties | 2,208 | 2,226 | 2,250
Capitalized costs, gross | 148,081 | 143,623 | 138,358
Net capitalized costs | 66,396 | 66,693 | 68,253
Oil and gas assets |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Less: accumulated depletion and depreciation | (81,685) | (76,930) | (70,105)
North America |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 132,858 | 128,807 | 124,690
Unproved properties | 2,108 | 2,128 | 2,159
Capitalized costs, gross | 134,966 | 130,935 | 126,849
Net capitalized costs | 65,021 | 65,388 | 65,618
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 | (69,945) | (65,547) | (61,231)
North Sea |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 8,606 | 8,258 | 7,438
Unproved properties | 0 | 0 | 0
Capitalized costs, gross | 8,606 | 8,258 | 7,438
Net capitalized costs | 224 | 152 | 1,487
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 | (8,382) | (8,106) | (5,951)
Offshore Africa |  |  |
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items] |  |  |
Proved properties | 4,409 | 4,332 | 3,980
Unproved properties | 100 | 98 | 91
Capitalized costs, gross | 4,509 | 4,430 | 4,071
Net capitalized costs | 1,151 | 1,153 | 1,148
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 | $ (3,358) | $ (3,277) | $ (2,923)

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