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Share capital - Narrative (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Jan. 15, 2025
CAD ($)
shares
Mar. 07, 2025
CAD ($)
shares
Dec. 31, 2024
CAD ($)
vote
shares
Dec. 31, 2023
CAD ($)
shares
Feb. 01, 2025
shares
Nov. 07, 2024
Nov. 02, 2023
Disclosure of classes of share capital [line items]              
Shares redeemed, value | $     $ 235 $ 223      
Shares issued from treasury, discount, percentage     2.00%        
Issue of common shares | $     $ 0 18      
Preferred shares              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 3,533 $ 3,667      
Special circumstance vote per share | vote     1        
Share conversion ratio     1        
Number of shares issued (in shares)     141,604,079        
Number of shares outstanding (in shares)     141,604,079        
First Preferred Shares              
Disclosure of classes of share capital [line items]              
Shares redeemed (in shares)     5,346,488 8,124,533      
Stated capital | $     $ 134 $ 203      
Shares redeemed, value | $     92 140      
Reduction of issued capital | $     42 63      
Series R              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 190 194      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     7,610,500        
Number of shares outstanding (in shares)     7,610,500        
Series T              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 129 132      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     5,175,533        
Number of shares outstanding (in shares)     5,175,533        
Series Z              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 66 68      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     2,658,031        
Number of shares outstanding (in shares)     2,658,031        
Series AA              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 285 293      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     11,171,231        
Number of shares outstanding (in shares)     11,171,231        
Series AC              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 161 165      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     6,312,874        
Number of shares outstanding (in shares)     6,312,874        
Series AF              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 221 227      
Dividend rate reset term     5 years        
Share conversion ratio     1        
Number of shares issued (in shares)     8,820,587        
Number of shares outstanding (in shares)     8,820,587        
Series AG              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 208 211      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     8,316,930        
Number of shares outstanding (in shares)     8,316,930        
Series AI              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 224 231      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     8,972,840        
Number of shares outstanding (in shares)     8,972,840        
Series AK              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 535 558      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     21,391,312        
Number of shares outstanding (in shares)     21,391,312        
Series AM              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 228 233      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     9,951,978        
Number of shares outstanding (in shares)     9,951,978        
Series AO              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 0 0      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     0        
Number of shares outstanding (in shares)     0        
Series AQ              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 201 $ 206      
Dividend rate reset term     5 years        
Number of shares issued (in shares)     8,102,214        
Number of shares outstanding (in shares)     8,102,214        
Class B | Issued capital              
Disclosure of classes of share capital [line items]              
Number of shares outstanding (in shares)     0 0      
Series AE              
Disclosure of classes of share capital [line items]              
Stated capital | $     $ 146 $ 151      
Share conversion ratio     1        
Number of shares issued (in shares)     5,827,613        
Number of shares outstanding (in shares)     5,827,613        
Major ordinary share transactions              
Disclosure of classes of share capital [line items]              
Number of shares issued (in shares) 9,540,786            
Number of shares outstanding (in shares) 308,654,258            
Issue of common shares | $ $ 314            
Major ordinary share transactions | First Preferred Shares              
Disclosure of classes of share capital [line items]              
Shares redeemed (in shares)   1,413,405          
Stated capital | $   $ 35          
Shares redeemed, value | $   25          
Reduction of issued capital | $   $ 10          
Major ordinary share transactions | Series AF              
Disclosure of classes of share capital [line items]              
Number of shares converted (in shares)         8,050    
Major ordinary share transactions | Series AE              
Disclosure of classes of share capital [line items]              
Number of shares converted (in shares)         2,479,334    
Maximum              
Disclosure of classes of share capital [line items]              
Percentage of public float           10.00% 10.00%