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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 |  |  |

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