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Share capital - Summary of principal terms of preference shares (Details) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 shares | Feb. 28, 2018 | Dec. 01, 2017 shares | Sep. 01, 2017 shares | Dec. 31, 2017 CAD ($) vote $ / shares shares | Dec. 31, 2016 CAD ($)
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Recurring redemption date term |  |  |  |  | 5 years |
Series Q |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 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 (as a percent) |  |  |  |  | 4.13% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 8,000,000 |
ISSUED (in shares) |  |  |  |  | 8,000,000 |
OUTSTANDING (in shares) |  |  |  |  | 8,000,000 |
STATED CAPITAL | $ |  |  |  |  | $ 200 | 200
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series S |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 8,000,000 |
ISSUED (in shares) |  |  |  |  | 3,513,448 |
OUTSTANDING (in shares) |  |  |  |  | 3,513,448 |
STATED CAPITAL | $ |  |  |  |  | $ 88 | 88
Series T |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 3.019% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 8,000,000 |
ISSUED (in shares) |  |  |  |  | 4,486,552 |
OUTSTANDING (in shares) |  |  |  |  | 4,486,552 |
STATED CAPITAL | $ |  |  |  |  | $ 112 | 112
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series Y |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 10,000,000 |
ISSUED (in shares) |  |  |  |  | 8,081,491 |
OUTSTANDING (in shares) |  |  | 8,772,468 |  | 8,081,491 |
STATED CAPITAL | $ |  |  |  |  | $ 202 | 219
Share conversion ratio |  |  | 1 |  |  |
Share conversions (in shares) |  |  | 1,276,161 |  |  |
Series Z |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 3.904% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 10,000,000 |
ISSUED (in shares) |  |  |  |  | 1,918,509 |
OUTSTANDING (in shares) |  |  | 1,227,532 |  | 1,918,509 |
STATED CAPITAL | $ |  |  |  |  | $ 48 | 31
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Share conversion ratio |  |  | 1 |  |  |
Share conversions (in shares) |  |  | 585,184 |  |  |
Series AA |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 3.61% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 20,000,000 |
ISSUED (in shares) |  |  |  |  | 11,398,396 |
OUTSTANDING (in shares) |  |  |  | 10,144,302 | 11,398,396 |
STATED CAPITAL | $ |  |  |  |  | $ 291 | 259
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Share conversion ratio |  |  |  | 1 |  |
Share conversions (in shares) |  |  |  | 965,769 |  |
Series AB |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 20,000,000 |
ISSUED (in shares) |  |  |  |  | 8,601,604 |
OUTSTANDING (in shares) |  |  |  | 9,855,698 | 8,601,604 |
STATED CAPITAL | $ |  |  |  |  | $ 219 | 251
Share conversion ratio |  |  |  | 1 |  |
Share conversions (in shares) |  |  |  | 2,219,863 |  |
Series AC |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 3.55% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 20,000,000 |
ISSUED (in shares) |  |  |  |  | 5,069,935 |
OUTSTANDING (in shares) |  |  |  |  | 5,069,935 |
STATED CAPITAL | $ |  |  |  |  | $ 129 | 129
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AD |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 20,000,000 |
ISSUED (in shares) |  |  |  |  | 14,930,065 |
OUTSTANDING (in shares) |  |  |  |  | 14,930,065 |
STATED CAPITAL | $ |  |  |  |  | $ 381 | 381
Series AE |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 24,000,000 |
ISSUED (in shares) |  |  |  |  | 9,292,133 |
OUTSTANDING (in shares) |  |  |  |  | 9,292,133 |
STATED CAPITAL | $ |  |  |  |  | $ 232 | 232
Series AF |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 3.11% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 24,000,000 |
ISSUED (in shares) |  |  |  |  | 6,707,867 |
OUTSTANDING (in shares) |  |  |  |  | 6,707,867 |
STATED CAPITAL | $ |  |  |  |  | $ 168 | 168
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AG |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 2.80% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 22,000,000 |
ISSUED (in shares) |  |  |  |  | 4,985,351 |
OUTSTANDING (in shares) |  |  |  |  | 4,985,351 |
STATED CAPITAL | $ |  |  |  |  | $ 125 | 125
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AH |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 22,000,000 |
ISSUED (in shares) |  |  |  |  | 9,014,649 |
OUTSTANDING (in shares) |  |  |  |  | 9,014,649 |
STATED CAPITAL | $ |  |  |  |  | $ 225 | 225
Series AI |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 2.75% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 22,000,000 |
ISSUED (in shares) |  |  |  |  | 5,949,884 |
OUTSTANDING (in shares) |  |  |  |  | 5,949,884 |
STATED CAPITAL | $ |  |  |  |  | $ 149 | 149
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AJ |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
AUTHORIZED (in shares) |  |  |  |  | 22,000,000 |
ISSUED (in shares) |  |  |  |  | 8,050,116 |
OUTSTANDING (in shares) |  |  |  |  | 8,050,116 |
STATED CAPITAL | $ |  |  |  |  | $ 201 | 201
Series AK |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 2.954% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 25,000,000 |
ISSUED (in shares) |  |  |  |  | 22,745,921 |
OUTSTANDING (in shares) |  |  |  |  | 22,745,921 |
STATED CAPITAL | $ |  |  |  |  | $ 569 | 569
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AL |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
AUTHORIZED (in shares) |  |  |  |  | 25,000,000 |
ISSUED (in shares) |  |  |  |  | 2,254,079 |
OUTSTANDING (in shares) |  |  |  |  | 2,254,079 |
STATED CAPITAL | $ |  |  |  |  | $ 56 | 56
Recurring redemption date term |  |  |  |  | 5 years |
Series AL | December 31, 2021 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
Series AL | Any Date Not A Conversion Date |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
Series AM |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 2.764% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
AUTHORIZED (in shares) |  |  |  |  | 30,000,000 |
ISSUED (in shares) |  |  |  |  | 9,546,615 |
OUTSTANDING (in shares) |  |  |  |  | 9,546,615 |
STATED CAPITAL | $ |  |  |  |  | $ 218 | 218
Recurring redemption date term |  |  |  |  | 5 years |
Dividend rate reset term |  |  |  |  | 5 years |
Series AN |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
AUTHORIZED (in shares) |  |  |  |  | 30,000,000 |
ISSUED (in shares) |  |  |  |  | 1,953,385 |
OUTSTANDING (in shares) |  |  |  |  | 1,953,385 |
STATED CAPITAL | $ |  |  |  |  | $ 45 | 45
Recurring redemption date term |  |  |  |  | 5 years |
Series AN | March 31, 2021 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
Series AN | Any Date Not A Conversion Date |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
Series AO |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 4.26% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 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 |
Dividend rate reset 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, 2017 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
Series AP | After March 31, 2017 And Any Date Not A Conversion Date |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
Series AQ |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) |  |  |  |  | 4.25% |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 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 |
Dividend rate reset 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, 2023 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.00 |
Series AR | After September 30, 2023 And Any Date Not A Conversion Date |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
REDEMPTION PRICE (cad per share) | $ / shares |  |  |  |  | $ 25.50 |
Preferred shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
STATED CAPITAL | $ |  |  |  |  | $ 4,004 | $ 4,004
Vote per share | vote |  |  |  |  | 1 |
Share conversion ratio |  |  |  |  | 1 |
Major ordinary share transactions | Series AC |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
ANNUAL DIVIDEND RATE (as a percent) | 4.38% | 3.55% |  |  |  |
OUTSTANDING (in shares) | 5,069,935 |  |  |  |  |
Share conversion ratio | 1 |  |  |  |  |
Share conversions (in shares) | 397,181 |  |  |  |  |
Major ordinary share transactions | Series AD |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
OUTSTANDING (in shares) | 14,930,065 |  |  |  |  |
Share conversion ratio | 1 |  |  |  |  |
Share conversions (in shares) | 5,356,937 |  |  |  |  |

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