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Share capital - Summary of Principal Terms of Preference Shares (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Preferred shares    
Disclosure of classes of share capital [line items]    
OUTSTANDING (in shares) 160,258,600  
STATED CAPITAL $ 4,003 $ 4,003
Series Q    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 8,000,000  
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  
AUTHORIZED (in shares) 8,000,000  
ISSUED (in shares) 7,998,900  
OUTSTANDING (in shares) 7,998,900  
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  
AUTHORIZED (in shares) 8,000,000  
ISSUED (in shares) 2,128,267  
OUTSTANDING (in shares) 2,128,267  
STATED CAPITAL $ 53 88
Series T    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 4.99%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 8,000,000  
ISSUED (in shares) 5,870,133  
OUTSTANDING (in shares) 5,870,133  
STATED CAPITAL $ 147 112
Recurring redemption date term 5 years  
Series Y    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 10,000,000  
ISSUED (in shares) 8,079,291  
OUTSTANDING (in shares) 8,079,291  
STATED CAPITAL $ 202 202
Series Z    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 3.904%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 10,000,000  
ISSUED (in shares) 1,918,509  
OUTSTANDING (in shares) 1,918,509  
STATED CAPITAL $ 48 48
Recurring redemption date term 5 years  
Series AA    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 3.61%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 20,000,000  
ISSUED (in shares) 11,397,196  
OUTSTANDING (in shares) 11,397,196  
STATED CAPITAL $ 291 291
Recurring redemption date term 5 years  
Series AB    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 20,000,000  
ISSUED (in shares) 8,599,204  
OUTSTANDING (in shares) 8,599,204  
STATED CAPITAL $ 219 219
Series AC    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 4.38%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 20,000,000  
ISSUED (in shares) 10,027,991  
OUTSTANDING (in shares) 10,027,991  
STATED CAPITAL $ 256 256
Recurring redemption date term 5 years  
Series AD    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 20,000,000  
ISSUED (in shares) 9,963,209  
OUTSTANDING (in shares) 9,963,209  
STATED CAPITAL $ 254 254
Series AE    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 24,000,000  
ISSUED (in shares) 6,512,913  
OUTSTANDING (in shares) 6,512,913  
STATED CAPITAL $ 163 163
Series AF    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 3.865%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 24,000,000  
ISSUED (in shares) 9,481,487  
OUTSTANDING (in shares) 9,481,487  
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  
AUTHORIZED (in shares) 22,000,000  
ISSUED (in shares) 8,979,530  
OUTSTANDING (in shares) 8,979,530  
STATED CAPITAL $ 224 125
Recurring redemption date term 5 years  
Series AH    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 22,000,000  
ISSUED (in shares) 5,017,570  
OUTSTANDING (in shares) 5,017,570  
STATED CAPITAL $ 125 225
Series AI    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 3.39%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 22,000,000  
ISSUED (in shares) 9,535,040  
OUTSTANDING (in shares) 9,535,040  
STATED CAPITAL $ 238 149
Recurring redemption date term 5 years  
Series AJ    
Disclosure of classes of share capital [line items]    
REDEMPTION PRICE (in cad per share) $ 25.50  
AUTHORIZED (in shares) 22,000,000  
ISSUED (in shares) 4,464,960  
OUTSTANDING (in shares) 4,464,960  
STATED CAPITAL $ 112 201
Series AK    
Disclosure of classes of share capital [line items]    
ANNUAL DIVIDEND RATE 3.306%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 25,000,000  
ISSUED (in shares) 23,190,312  
OUTSTANDING (in shares) 23,190,312  
STATED CAPITAL $ 580 568
Recurring redemption date term 5 years  
Series AL    
Disclosure of classes of share capital [line items]    
AUTHORIZED (in shares) 25,000,000  
ISSUED (in shares) 1,799,388  
OUTSTANDING (in shares) 1,799,388  
STATED CAPITAL $ 45 56
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  
AUTHORIZED (in shares) 30,000,000  
ISSUED (in shares) 10,439,978  
OUTSTANDING (in shares) 10,439,978  
STATED CAPITAL $ 239 218
Recurring redemption date term 5 years  
Series AN    
Disclosure of classes of share capital [line items]    
AUTHORIZED (in shares) 30,000,000  
ISSUED (in shares) 1,054,722  
OUTSTANDING (in shares) 1,054,722  
STATED CAPITAL $ 24 45
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]    
ANNUAL DIVIDEND RATE 4.26%  
REDEMPTION PRICE (in cad per share) $ 25.00  
AUTHORIZED (in shares) 30,000,000  
ISSUED (in shares) 4,600,000  
OUTSTANDING (in shares) 4,600,000  
STATED CAPITAL $ 118 118
Recurring redemption date term 5 years  
Series AP    
Disclosure of classes of share capital [line items]    
AUTHORIZED (in shares) 30,000,000  
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  
AUTHORIZED (in shares) 30,000,000  
ISSUED (in shares) 9,200,000  
OUTSTANDING (in shares) 9,200,000  
STATED CAPITAL $ 228 228
Recurring redemption date term 5 years  
Series AR    
Disclosure of classes of share capital [line items]    
AUTHORIZED (in shares) 30,000,000  
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