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Share capital - Summary of Principal Terms of Preference Shares (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]      
Shares redeemed, value   $ 223 $ 255
Contributed surplus   $ 1,258 1,172
Preferred shares      
Disclosure of classes of share capital [line items]      
ISSUED (in shares)   146,950,567  
OUTSTANDING (in shares)   146,950,567  
STATED CAPITAL   $ 3,667 3,870
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)   7,764,800  
OUTSTANDING (in shares)   7,764,800  
STATED CAPITAL   $ 194 200
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)   2,054,167  
OUTSTANDING (in shares)   2,054,167  
STATED CAPITAL   $ 51 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)   5,301,633  
OUTSTANDING (in shares)   5,301,633  
STATED CAPITAL   $ 132 146
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)   6,451,752  
OUTSTANDING (in shares)   6,451,752  
STATED CAPITAL   $ 161 175
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)   2,708,031  
OUTSTANDING (in shares)   2,708,031  
STATED CAPITAL   $ 68 74
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)   11,482,631  
OUTSTANDING (in shares)   11,482,631  
STATED CAPITAL   $ 293 312
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)   6,918,839  
OUTSTANDING (in shares)   6,918,839  
STATED CAPITAL   $ 176 195
Series AC      
Disclosure of classes of share capital [line items]      
ANNUAL DIVIDEND RATE   5.08%  
REDEMPTION PRICE (in cad per share)   $ 25.00  
ISSUED (in shares)   6,482,274  
OUTSTANDING (in shares)   6,482,274  
STATED CAPITAL   $ 165 255
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)   12,513,726  
OUTSTANDING (in shares)   12,513,726  
STATED CAPITAL   $ 319 254
Series AE      
Disclosure of classes of share capital [line items]      
REDEMPTION PRICE (in cad per share)   $ 25.50  
ISSUED (in shares)   6,022,513  
OUTSTANDING (in shares)   6,022,513  
STATED CAPITAL   $ 151 162
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)   9,076,087  
OUTSTANDING (in shares)   9,076,087  
STATED CAPITAL   $ 227 237
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)   8,442,830  
OUTSTANDING (in shares)   8,442,830  
STATED CAPITAL   $ 211 223
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)   4,784,070  
OUTSTANDING (in shares)   4,784,070  
STATED CAPITAL   $ 120 125
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)   9,246,640  
OUTSTANDING (in shares)   9,246,640  
STATED CAPITAL   $ 231 237
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)   4,118,260  
OUTSTANDING (in shares)   4,118,260  
STATED CAPITAL   $ 103 111
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)   22,303,812  
OUTSTANDING (in shares)   22,303,812  
STATED CAPITAL   $ 558 578
Recurring redemption date term   5 years  
Series AL      
Disclosure of classes of share capital [line items]      
ISSUED (in shares)   1,755,688  
OUTSTANDING (in shares)   1,755,688  
STATED CAPITAL   $ 44 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)   10,183,378  
OUTSTANDING (in shares)   10,183,378  
STATED CAPITAL   $ 233 239
Recurring redemption date term   5 years  
Series AN      
Disclosure of classes of share capital [line items]      
ISSUED (in shares)   1,035,822  
OUTSTANDING (in shares)   1,035,822  
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 0
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
Series AQ      
Disclosure of classes of share capital [line items]      
ANNUAL DIVIDEND RATE   6.538%  
REDEMPTION PRICE (in cad per share)   $ 25.00  
ISSUED (in shares)   8,303,614  
OUTSTANDING (in shares)   8,303,614  
STATED CAPITAL   $ 206 225
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
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  
Series AR | September 30, 2028 And Every Five Years Thereafter      
Disclosure of classes of share capital [line items]      
REDEMPTION PRICE (in cad per share)   $ 25.00