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Income Taxes - Provision for Income Taxes (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Major Components Of Tax Expense Income [Line Items]    
Current Tax Expense (Recovery) $ 1,403 $ 1,181
Deferred Tax Expense (Recovery) (474) (250)
Total Tax Expense (Recovery) 929 931
Canada    
Major Components Of Tax Expense Income [Line Items]    
Current Tax Expense (Recovery) 1,141 1,041
United States    
Major Components Of Tax Expense Income [Line Items]    
Current Tax Expense (Recovery) 9 (109)
Asia Pacific    
Major Components Of Tax Expense Income [Line Items]    
Current Tax Expense (Recovery) 214 224
Other International    
Major Components Of Tax Expense Income [Line Items]    
Current Tax Expense (Recovery) $ 39 $ 25