v3.25.4
Share capital - Narrative (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Apr. 15, 2025
CAD ($)
shares
Jan. 15, 2025
CAD ($)
shares
Mar. 06, 2026
CAD ($)
shares
Dec. 31, 2025
CAD ($)
vote
shares
Dec. 31, 2024
CAD ($)
shares
Nov. 06, 2025
May 07, 2025
Nov. 07, 2024
Disclosure of classes of share capital [line items]                
Shares redeemed, value | $       $ 216 $ 235      
Shares issued from treasury, discount, percentage         2.00%   2.00%  
Number of shares issued (in shares) 10,701,213 9,540,786            
Number of shares outstanding (in shares) 312,818,741 308,654,258            
Issue of common shares | $ $ 319 $ 314            
Preferred shares                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 3,288 $ 3,533      
Special circumstance vote per share | vote       1        
Share conversion ratio       1        
Number of shares issued (in shares)       131,755,879        
Number of shares outstanding (in shares)       131,755,879        
First Preferred Shares                
Disclosure of classes of share capital [line items]                
Shares redeemed (in shares)       9,848,200 5,346,488      
Stated capital | $       $ 245 $ 134      
Shares redeemed, value | $       182 92      
Reduction of issued capital | $       63 42      
Series R                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 173 190      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       6,913,600        
Number of shares outstanding (in shares)       6,913,600        
Series T                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 126 129      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       5,041,533        
Number of shares outstanding (in shares)       5,041,533        
Series Z                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 60 66      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       2,387,648        
Number of shares outstanding (in shares)       2,387,648        
Series AA                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 260 285      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       10,186,378        
Number of shares outstanding (in shares)       10,186,378        
Series AC                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 157 161      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       6,160,274        
Number of shares outstanding (in shares)       6,160,274        
Series AF                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 263 221      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       10,507,633        
Number of shares outstanding (in shares)       10,507,633        
Series AG                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 202 208      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       8,097,685        
Number of shares outstanding (in shares)       8,097,685        
Series AI                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 218 224      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       8,738,340        
Number of shares outstanding (in shares)       8,738,340        
Series AK                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 481 535      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       19,242,741        
Number of shares outstanding (in shares)       19,242,741        
Series AM                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 203 228      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       8,861,751        
Number of shares outstanding (in shares)       8,861,751        
Series AO                
Disclosure of classes of share capital [line items]                
Dividend rate reset term       5 years        
Series AQ                
Disclosure of classes of share capital [line items]                
Stated capital | $       $ 191 $ 201      
Dividend rate reset term       5 years        
Number of shares issued (in shares)       7,727,909        
Number of shares outstanding (in shares)       7,727,909        
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 | $       $ 80 $ 146      
Number of shares issued (in shares)       3,220,472        
Number of shares outstanding (in shares)       3,220,472        
Major ordinary share transactions | First Preferred Shares                
Disclosure of classes of share capital [line items]                
Shares redeemed (in shares)     1,169,641          
Stated capital | $     $ 29          
Shares redeemed, value | $     24          
Reduction of issued capital | $     $ 5          
Maximum                
Disclosure of classes of share capital [line items]                
Percentage of public float           10.00%   10.00%