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Share capital - Summary of Principal Terms of Preference Shares (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 01, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]        
Shares redeemed, value     $ 255 $ 297
Contributed surplus     $ 1,172 1,157
Preferred shares        
Disclosure of classes of share capital [line items]        
OUTSTANDING (in shares)     155,075,100  
STATED CAPITAL     $ 3,870 4,003
Series Q        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     0  
OUTSTANDING (in shares)     0  
STATED CAPITAL     $ 0 0
Series R        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     3.018%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     7,992,000  
OUTSTANDING (in shares)     7,992,000  
STATED CAPITAL     $ 200 200
Recurring redemption date term     5 years  
Series S        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     2,125,067  
OUTSTANDING (in shares)     2,125,067  
STATED CAPITAL     $ 53 53
Series T        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     4.99%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     5,820,633  
OUTSTANDING (in shares)     5,820,633  
STATED CAPITAL     $ 146 147
Recurring redemption date term     5 years  
Series Y        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     7,009,252  
OUTSTANDING (in shares)     7,009,252  
STATED CAPITAL     $ 175 202
Series Z        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     5.346%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     2,973,348  
OUTSTANDING (in shares)     2,973,348  
STATED CAPITAL     $ 74 48
Recurring redemption date term     5 years  
Series AA        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     4.94%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     12,254,761  
OUTSTANDING (in shares)     12,254,761  
STATED CAPITAL     $ 312 291
Recurring redemption date term     5 years  
Series AB        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     7,664,939  
OUTSTANDING (in shares)     7,664,939  
STATED CAPITAL     $ 195 219
Series AC        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE 5.08%   4.38%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     10,007,791  
OUTSTANDING (in shares)     10,007,791  
STATED CAPITAL     $ 255 256
Recurring redemption date term     5 years  
Series AD        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     9,951,109  
OUTSTANDING (in shares)     9,951,109  
STATED CAPITAL     $ 254 254
Series AE        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     6,460,913  
OUTSTANDING (in shares)     6,460,913  
STATED CAPITAL     $ 162 163
Series AF        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     3.865%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     9,472,387  
OUTSTANDING (in shares)     9,472,387  
STATED CAPITAL     $ 237 237
Recurring redemption date term     5 years  
Series AG        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     3.37%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     8,921,530  
OUTSTANDING (in shares)     8,921,530  
STATED CAPITAL     $ 223 224
Recurring redemption date term     5 years  
Series AH        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     4,987,870  
OUTSTANDING (in shares)     4,987,870  
STATED CAPITAL     $ 125 125
Series AI        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     3.39%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     9,477,640  
OUTSTANDING (in shares)     9,477,640  
STATED CAPITAL     $ 237 238
Recurring redemption date term     5 years  
Series AJ        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
ISSUED (in shares)     4,454,760  
OUTSTANDING (in shares)     4,454,760  
STATED CAPITAL     $ 111 112
Series AK        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     3.306%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     23,119,512  
OUTSTANDING (in shares)     23,119,512  
STATED CAPITAL     $ 578 580
Recurring redemption date term     5 years  
Series AL        
Disclosure of classes of share capital [line items]        
ISSUED (in shares)     1,797,188  
OUTSTANDING (in shares)     1,797,188  
STATED CAPITAL     $ 45 45
Recurring redemption date term     5 years  
Series AL | December 31, 2026        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.00  
Series AL | Any Date Not A Conversion Date        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
Series AM        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     2.939%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     10,422,778  
OUTSTANDING (in shares)     10,422,778  
STATED CAPITAL     $ 239 239
Recurring redemption date term     5 years  
Series AN        
Disclosure of classes of share capital [line items]        
ISSUED (in shares)     1,052,822  
OUTSTANDING (in shares)     1,052,822  
STATED CAPITAL     $ 24 24
Recurring redemption date term     5 years  
Series AN | March 31, 2026        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.00  
Series AN | Any Date Not A Conversion Date        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     25.50  
Series AO        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)      
ISSUED (in shares)     0  
OUTSTANDING (in shares)     0  
STATED CAPITAL   $ 118 $ 0 118
Recurring redemption date term     5 years  
Shares redeemed (in shares)   4,600,000    
Shares redeemed, value   $ 115    
Contributed surplus   $ 3    
Series AP        
Disclosure of classes of share capital [line items]        
ISSUED (in shares)     0  
OUTSTANDING (in shares)     0  
STATED CAPITAL     $ 0 0
Recurring redemption date term     5 years  
Series AP | March 31, 2027        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.00  
Series AP | After March 31, 2027 and Any Date Not A Conversion Date        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50  
Series AQ        
Disclosure of classes of share capital [line items]        
ANNUAL DIVIDEND RATE     4.812%  
REDEMPTION PRICE (in cad per share)     $ 25.00  
ISSUED (in shares)     9,108,800  
OUTSTANDING (in shares)     9,108,800  
STATED CAPITAL     $ 225 228
Recurring redemption date term     5 years  
Series AR        
Disclosure of classes of share capital [line items]        
ISSUED (in shares)     0  
OUTSTANDING (in shares)     0  
STATED CAPITAL     $ 0 $ 0
Recurring redemption date term     5 years  
Series AR | September 30, 2028        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.00  
Series AR | After September 30, 2028 And Any Date Not A Conversion Date        
Disclosure of classes of share capital [line items]        
REDEMPTION PRICE (in cad per share)     $ 25.50