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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of income taxes [line items]    
Deferred Income Taxes $ 1,064 $ 696
Deferred tax liability 0 0
Amounts of tax pools available, including tax losses 20,342 16,952
Canadian Federal Non Capital Losses    
Disclosure of income taxes [line items]    
Amounts of tax pools available, including tax losses 197 126
US Federal Net Operating Losses    
Disclosure of income taxes [line items]    
Amounts of tax pools available, including tax losses 3,000 3,700
Canadian Net Capital Losses    
Disclosure of income taxes [line items]    
Amounts of tax pools available, including tax losses 85 59
Net capital losses associated with unrealized foreign exchange losses $ 362 $ 141