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Income Taxes - Deferred Income Tax Liabilities and Deferred Income Tax Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of income taxes [line items]      
Deferred Income Tax Assets $ (1,298) $ (1,489) $ (778)
Deferred Income Tax Liabilities 4,279 4,981 4,515
Net Deferred Income Tax Liability 2,981 3,492 $ 3,737
Deferred Income Tax Assets to be Settled Within Twelve Months      
Disclosure of income taxes [line items]      
Deferred Income Tax Assets (29) (315)  
Deferred Income Tax Liabilities 68 138  
Deferred Income Tax Assets to be Settled After More Than Twelve Months      
Disclosure of income taxes [line items]      
Deferred Income Tax Assets (1,269) (1,174)  
Deferred Income Tax Liabilities $ 4,211 $ 4,843