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Share Capital and Warrants - Additional Information (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
Jun. 14, 2023
Feb. 14, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 07, 2024
Dec. 31, 2022
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       $ 1,445.0 $ 1,061.0    
NCIB, reduction to contributed surplus       966.0 $ 688.0    
Purchased and Cancelled       $ 87.0      
Stock Option Plan              
Disclosure of classes of share capital [Line Items]              
Shares available for future issuance (in shares) 48,800,000     48,800,000 45,500,000    
Common Shares              
Disclosure of classes of share capital [Line Items]              
NCIB, shares authorized for repurchase (in shares)           127,500,000  
Purchase of Common Shares under NCIB       55,861,000 43,611,000    
Shares outstanding (in shares) 1,825,038,000     1,825,038,000 1,871,868,000   1,909,190,000
Issued capital $ 15,659.0     $ 15,659.0 $ 16,031.0   $ 16,320.0
Common Shares | Renewed NCIB              
Disclosure of classes of share capital [Line Items]              
Purchase of Common Shares under NCIB       55,900,000 43,600,000    
Average carrying value       $ 939.0 $ 688.0    
Taxes paid       $ 27.0 $ 0.0    
Common Shares | Renewed NCIB | Potential ordinary share transactions              
Disclosure of classes of share capital [Line Items]              
NCIB, shares authorized for repurchase (in shares)     124,900,000        
Purchase of Common Shares under NCIB     1,500,000        
NCIB, shares redeemed, amount     $ 32.0        
Common Shares | Original NCIB              
Disclosure of classes of share capital [Line Items]              
NCIB, shares repurchased, price per share (in CAD per share)       $ 25.38 $ 24.32    
NCIB, shares redeemed, amount       $ 1,400.0 $ 1,100.0    
NCIB, reduction to contributed surplus       $ 966.0 $ 688.0    
Preferred Shares              
Disclosure of classes of share capital [Line Items]              
NCIB, shares redeemed, amount $ 250.0            
Shares outstanding (in shares) 26,000,000     26,000,000 36,000,000   36,000,000
Issued capital $ 356.0     $ 356.0 $ 519.0   $ 519.0
Preferred shares, price per share (in CAD per share) $ 25.00     $ 25.00      
Retained earnings $ 87.0     $ 87.0      
Purchases and cancelled (in shares)       10,000,000 0    
Purchased and Cancelled       $ 163.0 $ 0.0    
Preferred Shares | Series 3 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 10,000,000.0     10,000,000.0      
Preferred Shares | First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, conversion term       5 years      
Redeemable preferred shares, price per share       $ 25.00      
Preferred Shares | Series 1 And 2 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, conversion term       5 years      
Preferred Shares | Series 5 and 6 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, conversion term       5 years      
Preferred Shares | Series 7 and 8 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, conversion term       5 years      
Preferred Shares | Series 1, 3, 5, 7 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, conversion term       5 years      
Preferred Shares | Series 1 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 10,740,000     10,740,000      
Preferred Shares | Series 1 First Preferred Shares | Government of Canada Bond              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 173.00%     173.00%      
Preferred Shares | Series 5 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 8,000,000     8,000,000      
Preferred Shares | Series 5 First Preferred Shares | Government of Canada Bond              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 357.00%     357.00%      
Preferred Shares | Series 7 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 6,000,000     6,000,000      
Preferred Shares | Series 7 First Preferred Shares | Government of Canada Bond              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 352.00%     352.00%      
Preferred Shares | Series 2 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 1,260,000     1,260,000      
Preferred Shares | Series 2 First Preferred Shares | 90-Day Government of Canada Treasury Bills              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 173.00%     173.00%      
Preferred Shares | Series 6 First Preferred Shares | 90-Day Government of Canada Treasury Bills              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 357.00%     357.00%      
Preferred Shares | Series 8 First Preferred Shares | 90-Day Government of Canada Treasury Bills              
Disclosure of classes of share capital [Line Items]              
Dividend rate, basis spread 352.00%     352.00%      
Preferred Shares | Series 2,4,6,8 First Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Redeemable preferred shares, price per share       $ 25.50      
Second Preferred Shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 0     0 0    
Common Share Warrants              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares) 3,643,000     3,643,000 7,625,000   55,720,000
Issued capital $ 12.0     $ 12.0 $ 25.0   $ 184.0
Exercise price of warrants issued (in CAD per share)       $ 6.54      
Purchases and cancelled (in shares)   45,500,000   0 45,485,000    
Purchase price, warrants, per share   $ 22.18          
Purchased and Cancelled   $ 711.0   $ 0.0 $ 151.0    
Decrease through repurchase and cancellation of warrants, equity   560.0          
Decrease through repurchase and cancellation of warrants, transaction costs, equity   $ 2.0