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Equity Capital and Earnings Per Share - Changes in Common Shares Issued and Outstanding (Detail) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 48,727  
Balance, end of year $ 52,960 $ 48,727
Common shares    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,806 1,865
Repurchased for cancellation (83) (63)
Issued on exercise of stock options and deferred share units 6 4
Balance, end of year 1,729 1,806
Balance, beginning of year $ 21,527 $ 22,178
Repurchased for cancellation (989) (745)
Issued on exercise of stock options and deferred share units 143 94
Balance, end of year $ 20,681 $ 21,527