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Share capital - Narrative (Details) $ in Millions |  | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 CAD ($) shares | Mar. 08, 2024 CAD ($) shares | Dec. 31, 2023 CAD ($) vote shares | Dec. 31, 2022 CAD ($) shares | Nov. 02, 2023 | Nov. 03, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares redeemed, value |  |  | $ 223 | $ 255 |  |
Maximum |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Percentage of public float |  |  |  |  | 10.00% | 10.00%
Preferred shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 3,667 | 3,870 |  |
Special circumstance vote per share | vote |  |  | 1 |  |  |
Share conversion ratio |  |  | 1 |  |  |
Number of shares outstanding (in shares) | shares |  |  | 146,950,567 |  |  |
Series R |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 194 | 200 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 7,764,800 |  |  |
Series T |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 132 | 146 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 5,301,633 |  |  |
Series Z |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 68 | 74 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 2,708,031 |  |  |
Series AA |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 293 | 312 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 11,482,631 |  |  |
Series AC |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 165 | 255 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 6,482,274 |  |  |
Series AF |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 227 | 237 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 9,076,087 |  |  |
Series AG |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 211 | 223 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 8,442,830 |  |  |
Series AI |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 231 | 237 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 9,246,640 |  |  |
Series AK |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 558 | 578 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 22,303,812 |  |  |
Series AM |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Stated capital |  |  | $ 233 | 239 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 10,183,378 |  |  |
Series AO |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares redeemed (in shares) | shares | 4,600,000 |  |  |  |  |
Stated capital | $ 118 |  | $ 0 | 0 |  |
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 |  |  | $ 206 | $ 225 |  |
Dividend rate reset term |  |  | 5 years |  |  |
Number of shares outstanding (in shares) | shares |  |  | 8,303,614 |  |  |
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 |  |  | 8,124,533 | 584,300 |  |
Stated capital |  |  | $ 203 | $ 15 |  |
Shares redeemed, value |  |  | 140 | 10 |  |
Reduction of issued capital |  |  | $ 63 | $ 5 |  |
First Preferred Shares | Major ordinary share transactions |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares redeemed (in shares) | shares |  | 1,412,388 |  |  |  |
Stated capital |  | $ 36 |  |  |  |
Shares redeemed, value |  | 25 |  |  |  |
Reduction of issued capital |  | $ 11 |  |  |  |

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