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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties $ 136,108 $ 130,953 $ 128,872
Capitalized costs, unproved properties 2,250 2,436 2,579
Capitalized costs, gross 138,358 133,389 131,451
Net capitalized costs 68,253 67,784 70,203
Oil and gas assets      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Less: accumulated depletion and depreciation (70,105) (65,605) (61,248)
North America      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 124,690 119,707 117,643
Capitalized costs, unproved properties 2,159 2,353 2,510
Capitalized costs, gross 126,849 122,060 120,153
Net capitalized costs 65,618 65,130 67,329
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 (61,231) (56,930) (52,824)
North Sea      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 7,438 7,283 7,296
Capitalized costs, unproved properties 0 0 0
Capitalized costs, gross 7,438 7,283 7,296
Net capitalized costs 1,487 1,430 1,584
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 (5,951) (5,853) (5,712)
Offshore Africa      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 3,980 3,963 3,933
Capitalized costs, unproved properties 91 83 69
Capitalized costs, gross 4,071 4,046 4,002
Net capitalized costs 1,148 1,224 1,290
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 $ (2,923) $ (2,822) $ (2,712)