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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)