v3.25.4
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, 2025
Dec. 31, 2024
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 52,960  
Balance, end of year $ 52,488 $ 52,960
Common shares    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,729 1,806
Repurchased for cancellation (54) (83)
Issued on exercise of stock options and deferred share units 2 6
Balance, end of year 1,677 1,729
Balance, beginning of year $ 20,681 $ 21,527
Repurchased for cancellation (651) (990)
Issued on exercise of stock options and deferred share units 73 144
Balance, end of year $ 20,103 $ 20,681