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Equity Capital and Earnings Per share - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Billions
 11 Months Ended 12 Months Ended
Feb. 21, 2023
shares
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
CAD ($)
shares
Feb. 03, 2022
$ / shares
NCIB [Member]          
Disclosure of Dividends [line items]          
Total Cost of Share | $     $ 1.6    
Stock repurchased and retired during period value   $ 2,100 $ 0.2    
Stock repurchased during the period shares     6,900,000 6,900,000  
Percentage of shares purchased for cancellation to issued and outstanding shares         4.40%
Stock repurchased and retired during period shares   85,800,000 62,600,000 62,600,000  
Par value per share | (per share)     $ 25.47   $ 23.99
Options And Deferred Share Units [Member]          
Disclosure of Dividends [line items]          
Number of instruments outstanding in a share based payment arrangement   21,000,000 17,000,000    
Common shares [Member] | Major ordinary share transactions [Member]          
Disclosure of Dividends [line items]          
Dividend declared but not paid | $ / shares     $ 0.4    
NCIB Two Thousand And Twenty Three [Member]          
Disclosure of Dividends [line items]          
Common Stock Shares Authorised For Repurchase 55,700,000        
Total Cost of Share | $     $ 1.4    
Share repurchase date of expiry Feb. 23, 2023        
Stock repurchased and retired during period shares     55,700,000 55,700,000  
Par value per share | $ / shares     $ 25.48    
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%        
NCIB Two Thousand And Twenty Four [Member]          
Disclosure of Dividends [line items]          
Percentage of shares purchased for cancellation to issued and outstanding shares     2.80%    
Stock repurchased and retired during period shares     50,000,000 50,000,000  
NCIB Two Thousand Twenty Two And NCIB Two Thouand And Twenty Three [Member] | Retained earnings [member]          
Disclosure of Dividends [line items]          
Increase decrease through treasury share transactions | $       $ 850  
NCIB Two Thousand Twenty Two And NCIB Two Thouand And Twenty Three [Member] | Issued capital [Member]          
Disclosure of Dividends [line items]          
Increase decrease through treasury share transactions | $       $ 745