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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties $ 122,946 $ 118,907 $ 101,197
Capitalized costs, unproved properties 2,637 2,632 2,382
Capitalized costs, gross 125,583 121,539 103,579
Net capitalized costs 66,783 67,388 53,059
Oil and gas assets      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Less: accumulated depletion and depreciation (58,800) (54,151) (50,520)
North America      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 110,154 106,900 88,685
Capitalized costs, unproved properties 2,600 2,541 2,306
Capitalized costs, gross 112,754 109,441 90,991
Net capitalized costs 63,892 64,662 49,852
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 (48,862) (44,779) (41,139)
North Sea      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 7,321 7,126 7,380
Capitalized costs, unproved properties 0 0 0
Capitalized costs, gross 7,321 7,126 7,380
Net capitalized costs 1,586 1,473 1,796
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 (5,735) (5,653) (5,584)
Offshore Africa      
Capitalized Costs Relating To Oil And Gas Producing Activities, By Geographic Area1 [Line Items]      
Capitalized costs, proved properties 5,471 4,881 5,132
Capitalized costs, unproved properties 37 91 76
Capitalized costs, gross 5,508 4,972 5,208
Net capitalized costs 1,305 1,253 1,411
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 $ (4,203) $ (3,719) $ (3,797)