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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties $ 130,953 $ 128,872 $ 122,946
Capitalized costs, unproved properties 2,436 2,579 2,637
Capitalized costs, gross 133,389 131,451 125,583
Net capitalized costs 67,784 70,203 66,783
Oil and gas assets      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Less: accumulated depletion and depreciation (65,605) (61,248) (58,800)
North America      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 119,707 117,643 110,154
Capitalized costs, unproved properties 2,353 2,510 2,600
Capitalized costs, gross 122,060 120,153 112,754
Net capitalized costs 65,130 67,329 63,892
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 (56,930) (52,824) (48,862)
North Sea      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 7,283 7,296 7,321
Capitalized costs, unproved properties 0 0 0
Capitalized costs, gross 7,283 7,296 7,321
Net capitalized costs 1,430 1,584 1,586
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 (5,853) (5,712) (5,735)
Offshore Africa      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 3,963 3,933 5,471
Capitalized costs, unproved properties 83 69 37
Capitalized costs, gross 4,046 4,002 5,508
Net capitalized costs 1,224 1,290 1,305
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 $ (2,822) $ (2,712) $ (4,203)