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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, 2021
Dec. 31, 2020
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 53,006  
Balance, end of year $ 58,869 $ 53,006
Common shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,940 1,949
Repurchased for cancellation   (10)
Issued on exercise of stock options and deferred share units 3 1
Balance, end of year 1,943 1,940
Balance, beginning of year $ 23,042 $ 23,127
Repurchased for cancellation   (121)
Issued on exercise of stock options and deferred share units 51 36
Balance, end of year $ 23,093 $ 23,042