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Per Share Amounts - Additional Information (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Feb. 07, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items]        
Dividends paid on common shares     $ 77 $ 260
Net settlement rights        
Disclosure of non-adjusting events after reporting period [line items]        
Instruments excluded from calculation, shares (in shares)   18.0 31.0 32.0
Common shares        
Disclosure of non-adjusting events after reporting period [line items]        
Instruments excluded from calculation, value   $ 22    
Instruments excluded from calculation, shares (in shares)   1.9    
Dividends paid on common shares   $ 176 $ 77 $ 260
Dividends paid (in CAD per share)   $ 0.0875 $ 0.0625 $ 0.2125
Dividends declared (in CAD per share) $ 0.0350      
Preferred Shares        
Disclosure of non-adjusting events after reporting period [line items]        
Dividends paid on common shares   $ 34    
Dividends declared $ 9