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Equity Capital and Earnings Per share - Additional Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 11 Months Ended 12 Months Ended
Feb. 15, 2023
shares
Feb. 28, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2022
$ / shares
Dec. 31, 2022
CAD ($)
shares
Feb. 03, 2022
$ / shares
NCIB [Member]            
Disclosure of Dividends [line items]            
Share purchased and cancelled subsequently | shares         78.9  
Stock repurchased and retired during period value     $ 2,060      
Percentage of shares purchased for cancellation to issued and outstanding shares           4.40%
Stock repurchased and retired during period shares | shares     85.8      
Par value per share | $ / shares           $ 23.99
Retained earnings [member] | NCIB [Member]            
Disclosure of Dividends [line items]            
Purchase of treasury shares         $ 946  
Major ordinary share transactions [Member] | NCIB [Member]            
Disclosure of Dividends [line items]            
Stock repurchased and retired during period value   $ 97        
Common shares [Member] | NCIB [Member]            
Disclosure of Dividends [line items]            
Total Cost of Share         1,884  
Purchase of treasury shares         $ 938  
Common shares [Member] | Major ordinary share transactions [Member]            
Disclosure of Dividends [line items]            
Dividend declared but not paid | $ / shares       $ 0.365    
NCIB Two Thousand And Twenty Three [Member]            
Disclosure of Dividends [line items]            
Common Stock Shares Authorised For Repurchase | shares 55.7          
NCIB Two Thousand And Twenty Three [Member] | Major ordinary share transactions [Member]            
Disclosure of Dividends [line items]            
Percentage of the companys issued and outstanding common shares 3.00%