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Share Capital and Warrants - Additional Information (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 14, 2023
Oct. 30, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Nov. 01, 2023
Dec. 31, 2021
Disclosure of classes of share capital [Line Items]                      
Maximum percentage of preferred stock upon issuance or outstanding of common stock             20.00%        
NCIB, shares redeemed, amount     $ 361.0     $ 659.0 $ 711.0 $ 2,143.0      
Payment for Purchase of Warrants     $ 600.0     $ 0.0 $ 600.0 $ 0.0      
Common shares                      
Disclosure of classes of share capital [Line Items]                      
Purchase of Common Shares Under NCIB (in shares)             29,388,000   112,489,000    
Shares outstanding (in shares)     1,885,559,000       1,885,559,000   1,909,190,000   2,001,211,000
Issued capital     $ 16,146.0       $ 16,146.0   $ 16,320.0   $ 17,016.0
Common shares | Renewed NCIB                      
Disclosure of classes of share capital [Line Items]                      
Purchase of Common Shares Under NCIB (in shares)             29,400,000        
NCIB, shares repurchased, price per share (in CAD per share)             $ 24.19        
NCIB, shares redeemed, amount             $ 711.0        
NCIB, reduction to contributed surplus             $ 460.0        
Common shares | Potential ordinary share transactions | Renewed NCIB                      
Disclosure of classes of share capital [Line Items]                      
NCIB, shares authorized for repurchase (in shares)   92,500,000               133,000,000  
Purchase of Common Shares Under NCIB (in shares)   3,300,000                  
NCIB, shares redeemed, amount   $ 89.0                  
Stock Option Plan                      
Disclosure of classes of share capital [Line Items]                      
Shares available for future issuance (in shares)     45,200,000       45,200,000   43,100,000    
Preference shares                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)     36,000,000       36,000,000        
Issued capital     $ 519.0       $ 519.0        
Expected dividend     6.29% 6.29% 5.86%            
Common Share Warrants                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)     7,921,000       7,921,000   55,720,000   65,119,000
Issued capital     $ 26.0       $ 26.0   $ 184.0   $ 215.0
Exercise price of warrants issued (in CAD per share) $ 6.54           $ 6.54        
Purchased and cancelled (in shares) 45,500,000           45,485,000   0    
Purchased and Cancelled $ 711.0           $ 151.0   $ 0.0    
Warrants purchase price (in CAD per share) $ 22.18                    
Decrease through repurchase and cancellation of warrants, equity $ 560.0                    
Decrease through repurchase and cancellation of warrants, transaction costs, equity $ 2.0                    
Payment for Purchase of Warrants     $ 600.0