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Income Taxes - Deferred Income Tax Liabilities and Deferred Income Tax Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of income taxes [line items]      
Deferred income tax liabilities $ 4,515 $ 4,046 $ 4,146
Deferred Income Tax Assets (778) (1,454) (948)
Net deferred income tax liability, beginning balance 3,737 2,592 $ 3,198
1 Year      
Disclosure of income taxes [line items]      
Deferred income tax liabilities 55 0  
Deferred Income Tax Assets (31) (556)  
Deferred Income Tax Assets to be Settled After More Than Twelve Months      
Disclosure of income taxes [line items]      
Deferred income tax liabilities 4,460 4,046  
Deferred Income Tax Assets $ (747) $ (898)