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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)