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Share capital (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
CAD ($)
shares
Jun. 30, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
shares
Jun. 30, 2025
CAD ($)
Aug. 04, 2026
May 01, 2026
shares
Mar. 31, 2026
Disclosure of classes of share capital [line items]              
Payments to acquire or redeem entity's shares | $ $ 33 $ 32 $ 95 $ 96      
First Preferred Shares              
Disclosure of classes of share capital [line items]              
Number of shares repurchased and retired (in shares) 1,369,920   2,886,461        
Cancellation of treasury shares | $ $ 34   $ 72        
Payments to acquire or redeem entity's shares | $ 30   62        
Reduction of issued capital | $ $ 4   $ 10        
Series AM Preferred Shares              
Disclosure of classes of share capital [line items]              
Share conversion ratio             1
Dividend rate reset term             5 years
Annual fixed dividend rate             4.837%
Series AG Preferred Shares              
Disclosure of classes of share capital [line items]              
Share conversion ratio           1  
Dividend rate reset term           5 years  
Annual fixed dividend rate           5.30%  
Number of shares converted (in shares)           121,070  
Number of shares issued (in shares)           8,032,285  
Series AH Preferred Shares              
Disclosure of classes of share capital [line items]              
Share conversion ratio           1  
Number of shares converted (in shares)           1,464,469  
Number of shares outstanding (in shares)           4,175,513  
Series AI Preferred Shares | Major ordinary share transactions              
Disclosure of classes of share capital [line items]              
Dividend rate reset term         5 years    
Annual fixed dividend rate         5.10%    
Series AJ Preferred Shares | Major ordinary share transactions              
Disclosure of classes of share capital [line items]              
Share conversion ratio         1