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Income Taxes - Deferred Income Tax Liabilities and Deferred Income Tax Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income taxes [line items]      
Deferred Income Tax Liabilities $ 4,146 $ 4,543 $ 5,545
Deferred Income Tax Assets (948) (511) (684)
Net Deferred Income Tax Liability 3,198 4,032 $ 4,861
Less Than 1 Year [Member]      
Disclosure of income taxes [line items]      
Deferred Income Tax Liabilities   3  
Deferred Income Tax Assets (88) (113)  
1 Year [Member]      
Disclosure of income taxes [line items]      
Deferred Income Tax Liabilities 4,146 4,540  
Deferred Income Tax Assets $ (860) $ (398)