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Employee Future Benefits - Cash Payments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans $ 154 $ 152
Retiree welfare plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 12 12
Defined benefit plans | Pension plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 57 59
Defined benefit plans | Retiree welfare plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 12 12
Defined contribution plans | Pension plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans 97 93
Defined contribution plans | Retiree welfare plans    
Disclosure of net defined benefit liability (asset) [Line Items]    
Cash payment for future benefit plans $ 0 $ 0