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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Proved properties $ 141,397 $ 136,108 $ 130,953
Unproved properties 2,226 2,250 2,436
Capitalized costs, gross 143,623 138,358 133,389
Net capitalized costs 66,693 68,253 67,784
Oil and gas assets      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Less: accumulated depletion and depreciation (76,930) (70,105) (65,605)
North America      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Proved properties 128,807 124,690 119,707
Unproved properties 2,128 2,159 2,353
Capitalized costs, gross 130,935 126,849 122,060
Net capitalized costs 65,388 65,618 65,130
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 (65,547) (61,231) (56,930)
North Sea      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Proved properties 8,258 7,438 7,283
Unproved properties 0 0 0
Capitalized costs, gross 8,258 7,438 7,283
Net capitalized costs 152 1,487 1,430
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 (8,106) (5,951) (5,853)
Offshore Africa      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Proved properties 4,332 3,980 3,963
Unproved properties 98 91 83
Capitalized costs, gross 4,430 4,071 4,046
Net capitalized costs 1,153 1,148 1,224
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 $ (3,277) $ (2,923) $ (2,822)