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Income Taxes - Deferred Income Tax Liabilities and Deferred Income Tax Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income taxes [line items]      
Deferred Income Tax Liabilities $ 4,046 $ 4,146 $ 4,543
Deferred Income Tax Assets (1,454) (948) (511)
Net Deferred Income Tax Liability 2,592 3,198 $ 4,032
1 Year      
Disclosure of income taxes [line items]      
Deferred Income Tax Assets (556) (88)  
Deferred Income Tax Assets to be Settled After More Than Twelve Months      
Disclosure of income taxes [line items]      
Deferred Income Tax Liabilities 4,046 4,146  
Deferred Income Tax Assets $ (898) $ (860)