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Share capital - Narrative (Details) $ in Millions |  | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2025 CAD ($) shares | Mar. 07, 2025 CAD ($) shares | Dec. 31, 2024 CAD ($) vote shares | Dec. 31, 2023 CAD ($) shares | Feb. 01, 2025 shares | Nov. 07, 2024 | Nov. 02, 2023
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Shares redeemed, value | $ |  |  | $ 235 | $ 223 |  |  |
Shares issued from treasury, discount, percentage |  |  | 2.00% |  |  |  |
Issue of common shares | $ |  |  | $ 0 | 18 |  |  |
Preferred shares |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 3,533 | $ 3,667 |  |  |
Special circumstance vote per share | vote |  |  | 1 |  |  |  |
Share conversion ratio |  |  | 1 |  |  |  |
Number of shares issued (in shares) |  |  | 141,604,079 |  |  |  |
Number of shares outstanding (in shares) |  |  | 141,604,079 |  |  |  |
First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Shares redeemed (in shares) |  |  | 5,346,488 | 8,124,533 |  |  |
Stated capital | $ |  |  | $ 134 | $ 203 |  |  |
Shares redeemed, value | $ |  |  | 92 | 140 |  |  |
Reduction of issued capital | $ |  |  | 42 | 63 |  |  |
Series R |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 190 | 194 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 7,610,500 |  |  |  |
Number of shares outstanding (in shares) |  |  | 7,610,500 |  |  |  |
Series T |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 129 | 132 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 5,175,533 |  |  |  |
Number of shares outstanding (in shares) |  |  | 5,175,533 |  |  |  |
Series Z |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 66 | 68 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 2,658,031 |  |  |  |
Number of shares outstanding (in shares) |  |  | 2,658,031 |  |  |  |
Series AA |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 285 | 293 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 11,171,231 |  |  |  |
Number of shares outstanding (in shares) |  |  | 11,171,231 |  |  |  |
Series AC |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 161 | 165 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 6,312,874 |  |  |  |
Number of shares outstanding (in shares) |  |  | 6,312,874 |  |  |  |
Series AF |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 221 | 227 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Share conversion ratio |  |  | 1 |  |  |  |
Number of shares issued (in shares) |  |  | 8,820,587 |  |  |  |
Number of shares outstanding (in shares) |  |  | 8,820,587 |  |  |  |
Series AG |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 208 | 211 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 8,316,930 |  |  |  |
Number of shares outstanding (in shares) |  |  | 8,316,930 |  |  |  |
Series AI |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 224 | 231 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 8,972,840 |  |  |  |
Number of shares outstanding (in shares) |  |  | 8,972,840 |  |  |  |
Series AK |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 535 | 558 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 21,391,312 |  |  |  |
Number of shares outstanding (in shares) |  |  | 21,391,312 |  |  |  |
Series AM |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 228 | 233 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 9,951,978 |  |  |  |
Number of shares outstanding (in shares) |  |  | 9,951,978 |  |  |  |
Series AO |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 0 | 0 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 0 |  |  |  |
Number of shares outstanding (in shares) |  |  | 0 |  |  |  |
Series AQ |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 201 | $ 206 |  |  |
Dividend rate reset term |  |  | 5 years |  |  |  |
Number of shares issued (in shares) |  |  | 8,102,214 |  |  |  |
Number of shares outstanding (in shares) |  |  | 8,102,214 |  |  |  |
Class B | Issued capital |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  | 0 | 0 |  |  |
Series AE |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Stated capital | $ |  |  | $ 146 | $ 151 |  |  |
Share conversion ratio |  |  | 1 |  |  |  |
Number of shares issued (in shares) |  |  | 5,827,613 |  |  |  |
Number of shares outstanding (in shares) |  |  | 5,827,613 |  |  |  |
Major ordinary share transactions |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares issued (in shares) | 9,540,786 |  |  |  |  |  |
Number of shares outstanding (in shares) | 308,654,258 |  |  |  |  |  |
Issue of common shares | $ | $ 314 |  |  |  |  |  |
Major ordinary share transactions | First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Shares redeemed (in shares) |  | 1,413,405 |  |  |  |  |
Stated capital | $ |  | $ 35 |  |  |  |  |
Shares redeemed, value | $ |  | 25 |  |  |  |  |
Reduction of issued capital | $ |  | $ 10 |  |  |  |  |
Major ordinary share transactions | Series AF |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  |  | 8,050 |  |
Major ordinary share transactions | Series AE |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  |  | 2,479,334 |  |
Maximum |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Percentage of public float |  |  |  |  |  | 10.00% | 10.00%

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