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Share Capital and Warrants - Additional Information (Details) - CAD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 27, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Oct. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Nov. 07, 2024
Dec. 31, 2023
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   $ 918 $ 732 $ 1,281 $ 1,337            
Renewed NCIB                      
Disclosure of classes of share capital [Line Items]                      
Average carrying value       $ 762              
Stock Option Plan                      
Disclosure of classes of share capital [Line Items]                      
Shares available for future issuance (in shares)   24,900   24,900              
Common shares                      
Disclosure of classes of share capital [Line Items]                      
Purchase of Common Shares Under NCIB (in shares)       60,537   55,861          
Common Shares Issued Under Employee Benefit Plan       $ 76              
Shares outstanding (in shares)   1,766,329   1,766,329   1,825,038         1,871,868
Common shares | Paid in Surplus                      
Disclosure of classes of share capital [Line Items]                      
Common Shares Issued Under Employee Benefit Plan       $ (6)              
Common shares | Renewed NCIB                      
Disclosure of classes of share capital [Line Items]                      
Purchase of Common Shares Under NCIB (in shares)       60,500              
NCIB, shares repurchased, price per share (in CAD per share)       $ 20.75              
NCIB, shares redeemed, amount       $ 1,300              
NCIB, reduction to contributed surplus       541              
NCIB, reduction to retained earnings       221              
Average carrying value       737              
Taxes paid       $ 25              
Common shares | Renewed NCIB | Potential ordinary share transactions                      
Disclosure of classes of share capital [Line Items]                      
Number of shares authorized (in shares)                   127,500  
Purchase of Common Shares Under NCIB (in shares) 17,000                    
NCIB, shares redeemed, amount $ 409                    
NCIB, shares authorized for repurchase (in shares) 48,800           120,000        
Preferred Shares                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)   12,000   12,000   26,000         36,000
Retained earnings   $ 107   $ 107              
Preferred Shares | Series 5 First Preferred Shares                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)                 8,000    
Preferred Shares | Series 7 First Preferred Shares                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)               6,000      
Preferred Shares | Series 5 And 7 First Preferred Shares                      
Disclosure of classes of share capital [Line Items]                      
NCIB, shares redeemed, amount       $ 350              
Preferred Shares, Price Per Share   $ 25.00   $ 25.00              
Common Share Warrants                      
Disclosure of classes of share capital [Line Items]                      
Shares outstanding (in shares)   2,905   2,905   3,643         7,625
Exercise price of warrants issued (in CAD per share)       $ 6.54