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Equity Capital and Earnings Per Share - Summary of Changes in Issued and Outstanding Shares - Common Shares (Detail) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 48,226  
Balance, end of year $ 48,727 $ 48,226
Common shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,865 1,943
Repurchased for cancellation (63) (79)
Issued on exercise of stock options and deferred share units 4 1
Balance, end of year 1,806 1,865
Balance, beginning of year $ 22,178 $ 23,093
Repurchased for cancellation (745) (938)
Issued on exercise of stock options and deferred share units 94 23
Balance, end of year $ 21,527 $ 22,178