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Income Taxes - Schedule Of Provision For Income Tax (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current      
Other taxes $ 13 $ 6 $ 13
Current income tax 1,848 (257) 434
Deferred      
Deferred corporate income tax 399 (181) (895)
Deferred income tax 399 (181) (894)
Income tax 2,247 (438) (460)
North America      
Current      
Current corporate income tax 1,841 (245) 354
North Sea      
Current      
Current corporate income tax 7 (4) 112
Current PRT - North Sea (34) (31) (89)
Deferred      
Deferred PRT – North Sea 0 0 1
Offshore Africa      
Current      
Current corporate income tax $ 21 $ 17 $ 44