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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, 2022
Dec. 31, 2021
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 58,869  
Balance, end of year $ 56,379 $ 58,869
Common shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,943 1,940
Repurchased for cancellation (79)  
Issued on exercise of stock options and deferred share units 1 3
Balance, end of year 1,865 1,943
Balance, beginning of year $ 23,093 $ 23,042
Repurchased for cancellation (938)  
Issued on exercise of stock options and deferred share units 23 51
Balance, end of year $ 22,178 $ 23,093