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Share capital - Narrative (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Mar. 31, 2022
CAD ($)
shares
Mar. 08, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
vote
shares
Dec. 31, 2022
CAD ($)
shares
Nov. 02, 2023
Nov. 03, 2022
Disclosure of classes of share capital [line items]            
Shares redeemed, value     $ 223 $ 255    
Maximum            
Disclosure of classes of share capital [line items]            
Percentage of public float         10.00% 10.00%
Preferred shares            
Disclosure of classes of share capital [line items]            
Stated capital     $ 3,667 3,870    
Special circumstance vote per share | vote     1      
Share conversion ratio     1      
Number of shares outstanding (in shares) | shares     146,950,567      
Series R            
Disclosure of classes of share capital [line items]            
Stated capital     $ 194 200    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     7,764,800      
Series T            
Disclosure of classes of share capital [line items]            
Stated capital     $ 132 146    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     5,301,633      
Series Z            
Disclosure of classes of share capital [line items]            
Stated capital     $ 68 74    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     2,708,031      
Series AA            
Disclosure of classes of share capital [line items]            
Stated capital     $ 293 312    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     11,482,631      
Series AC            
Disclosure of classes of share capital [line items]            
Stated capital     $ 165 255    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     6,482,274      
Series AF            
Disclosure of classes of share capital [line items]            
Stated capital     $ 227 237    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     9,076,087      
Series AG            
Disclosure of classes of share capital [line items]            
Stated capital     $ 211 223    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     8,442,830      
Series AI            
Disclosure of classes of share capital [line items]            
Stated capital     $ 231 237    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     9,246,640      
Series AK            
Disclosure of classes of share capital [line items]            
Stated capital     $ 558 578    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     22,303,812      
Series AM            
Disclosure of classes of share capital [line items]            
Stated capital     $ 233 239    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     10,183,378      
Series AO            
Disclosure of classes of share capital [line items]            
Shares redeemed (in shares) | shares 4,600,000          
Stated capital $ 118   $ 0 0    
Shares redeemed, value $ 115          
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     0      
Series AQ            
Disclosure of classes of share capital [line items]            
Stated capital     $ 206 $ 225    
Dividend rate reset term     5 years      
Number of shares outstanding (in shares) | shares     8,303,614      
Class B | Issued capital            
Disclosure of classes of share capital [line items]            
Number of shares outstanding (in shares) | shares     0 0    
First Preferred Shares            
Disclosure of classes of share capital [line items]            
Shares redeemed (in shares) | shares     8,124,533 584,300    
Stated capital     $ 203 $ 15    
Shares redeemed, value     140 10    
Reduction of issued capital     $ 63 $ 5    
First Preferred Shares | Major ordinary share transactions            
Disclosure of classes of share capital [line items]            
Shares redeemed (in shares) | shares   1,412,388        
Stated capital   $ 36        
Shares redeemed, value   25        
Reduction of issued capital   $ 11