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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Capitalized Costs Related to Crude Oil and Natural Gas Activities (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties $ 128,872 $ 122,946 $ 118,907
Capitalized costs, unproved properties 2,579 2,637 2,632
Capitalized costs, gross 131,451 125,583 121,539
Net capitalized costs 70,203 66,783 67,388
Oil and gas assets      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Less: accumulated depletion and depreciation (61,248) (58,800) (54,151)
North America      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 117,643 110,154 106,900
Capitalized costs, unproved properties 2,510 2,600 2,541
Capitalized costs, gross 120,153 112,754 109,441
Net capitalized costs 67,329 63,892 64,662
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 (52,824) (48,862) (44,779)
North Sea      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 7,296 7,321 7,126
Capitalized costs, unproved properties 0 0 0
Capitalized costs, gross 7,296 7,321 7,126
Net capitalized costs 1,584 1,586 1,473
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 (5,712) (5,735) (5,653)
Offshore Africa      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 3,933 5,471 4,881
Capitalized costs, unproved properties 69 37 91
Capitalized costs, gross 4,002 5,508 4,972
Net capitalized costs 1,290 1,305 1,253
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 $ (2,712) $ (4,203) $ (3,719)