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Share capital - Narrative (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Mar. 01, 2023
shares
Mar. 31, 2022
CAD ($)
shares
Mar. 01, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
vote
shares
Dec. 31, 2021
CAD ($)
shares
Jan. 01, 2023
CAD ($)
Nov. 03, 2021
Disclosure of classes of share capital [line items]              
Shares redeemed, value       $ 255 $ 297    
Maximum              
Disclosure of classes of share capital [line items]              
Percentage of public float             10.00%
Preferred shares              
Disclosure of classes of share capital [line items]              
Stated capital       $ 3,870 4,003    
Special circumstance vote per share | vote       1      
Share conversion ratio       1      
Number of shares outstanding (in shares) | shares       155,075,100      
Series R              
Disclosure of classes of share capital [line items]              
Stated capital       $ 200 200    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       7,992,000      
Series T              
Disclosure of classes of share capital [line items]              
Stated capital       $ 146 147    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       5,820,633      
Series Z              
Disclosure of classes of share capital [line items]              
Stated capital       $ 74 48    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       2,973,348      
Series AA              
Disclosure of classes of share capital [line items]              
Stated capital       $ 312 291    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       12,254,761      
Series AC              
Disclosure of classes of share capital [line items]              
Stated capital       $ 255 256    
Dividend rate reset term 5 years     5 years      
Share conversion ratio 1   1        
Number of shares outstanding (in shares) | shares       10,007,791      
Series AF              
Disclosure of classes of share capital [line items]              
Stated capital       $ 237 237    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       9,472,387      
Series AG              
Disclosure of classes of share capital [line items]              
Stated capital       $ 223 224    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       8,921,530      
Series AI              
Disclosure of classes of share capital [line items]              
Stated capital       $ 237 238    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       9,477,640      
Series AK              
Disclosure of classes of share capital [line items]              
Stated capital       $ 578 580    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       23,119,512      
Series AM              
Disclosure of classes of share capital [line items]              
Stated capital       $ 239 239    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       10,422,778      
Series AO              
Disclosure of classes of share capital [line items]              
Shares redeemed (in shares) | shares   4,600,000          
Stated capital   $ 118   $ 0 118    
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       $ 225 $ 228    
Dividend rate reset term       5 years      
Number of shares outstanding (in shares) | shares       9,108,800      
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       584,300      
Stated capital       $ 15      
Shares redeemed, value       10      
Reduction of issued capital       5      
First Preferred Shares | Major ordinary share transactions              
Disclosure of classes of share capital [line items]              
Shares redeemed (in shares) | shares     1,090,400        
Stated capital           $ 27  
Shares redeemed, value     $ 20        
Reduction of issued capital     $ 7        
Number of shares converted (in shares) | shares 3,635,351   3,635,351        
Series AD              
Disclosure of classes of share capital [line items]              
Stated capital       $ 254 $ 254    
Share conversion ratio 1   1        
Number of shares converted (in shares) | shares 351,634   351,634        
Number of shares outstanding (in shares) | shares       9,951,109