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Income Taxes - Schedule Of Provision For Income Tax (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
Other taxes $ 13 $ 9 $ 11
Current income tax 434 374 (164)
Deferred      
Deferred corporate income tax (895) 540 586
Deferred income tax (894) 557 640
Income tax (recovery) expense (460) 931 476
North America      
Current      
Current corporate income tax 354 312 (145)
North Sea      
Current      
Current corporate income tax 112 28 57
Current PRT - North Sea (89) (29) (132)
Deferred      
Deferred PRT - North Sea 1 17 54
Offshore Africa      
Current      
Current corporate income tax $ 44 $ 54 $ 45