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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, 2025 | Apr. 15, 2025 | Jan. 15, 2025 | Dec. 31, 2024
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued (in shares) |  | 10,701,213 | 9,540,786 |
Number of shares outstanding (in shares) |  | 312,818,741 | 308,654,258 |
Preferred shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued (in shares) | 131,755,879 |  |  |
Number of shares outstanding (in shares) | 131,755,879 |  |  |
Stated capital | $ 3,288 |  |  | $ 3,533
Series Q |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 0 |  |  |
Number of shares outstanding (in shares) | 0 |  |  |
Stated capital | $ 0 |  |  | 0
Series R |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 4.733% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 6,913,600 |  |  |
Number of shares outstanding (in shares) | 6,913,600 |  |  |
Stated capital | $ 173 |  |  | 190
Recurring redemption date term | 5 years |  |  |
Series S |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 1,875,977 |  |  |
Number of shares outstanding (in shares) | 1,875,977 |  |  |
Stated capital | $ 47 |  |  | 50
Series T |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 4.99% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 5,041,533 |  |  |
Number of shares outstanding (in shares) | 5,041,533 |  |  |
Stated capital | $ 126 |  |  | 129
Recurring redemption date term | 5 years |  |  |
Series Y |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 5,382,087 |  |  |
Number of shares outstanding (in shares) | 5,382,087 |  |  |
Stated capital | $ 135 |  |  | 149
Series Z |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 5.346% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 2,387,648 |  |  |
Number of shares outstanding (in shares) | 2,387,648 |  |  |
Stated capital | $ 60 |  |  | 66
Recurring redemption date term | 5 years |  |  |
Series AA |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 4.94% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 10,186,378 |  |  |
Number of shares outstanding (in shares) | 10,186,378 |  |  |
Stated capital | $ 260 |  |  | 285
Recurring redemption date term | 5 years |  |  |
Series AB |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 6,062,639 |  |  |
Number of shares outstanding (in shares) | 6,062,639 |  |  |
Stated capital | $ 155 |  |  | 163
Series AC |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 5.08% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 6,160,274 |  |  |
Number of shares outstanding (in shares) | 6,160,274 |  |  |
Stated capital | $ 157 |  |  | 161
Recurring redemption date term | 5 years |  |  |
Series AD |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 10,944,329 |  |  |
Number of shares outstanding (in shares) | 10,944,329 |  |  |
Stated capital | $ 279 |  |  | 299
Series AE |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 3,220,472 |  |  |
Number of shares outstanding (in shares) | 3,220,472 |  |  |
Stated capital | $ 80 |  |  | 146
Series AF |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 5.496% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 10,507,633 |  |  |
Number of shares outstanding (in shares) | 10,507,633 |  |  |
Stated capital | $ 263 |  |  | 221
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 |  |  |
Number of shares issued (in shares) | 8,097,685 |  |  |
Number of shares outstanding (in shares) | 8,097,685 |  |  |
Stated capital | $ 202 |  |  | 208
Recurring redemption date term | 5 years |  |  |
Series AH |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 4,188,913 |  |  |
Number of shares outstanding (in shares) | 4,188,913 |  |  |
Stated capital | $ 105 |  |  | 116
Series AI |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 3.39% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 8,738,340 |  |  |
Number of shares outstanding (in shares) | 8,738,340 |  |  |
Stated capital | $ 218 |  |  | 224
Recurring redemption date term | 5 years |  |  |
Series AJ |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Redemption price (in cad per share) | $ 25.50 |  |  |
Number of shares issued (in shares) | 3,776,360 |  |  |
Number of shares outstanding (in shares) | 3,776,360 |  |  |
Stated capital | $ 94 |  |  | 96
Series AK |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 3.306% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 19,242,741 |  |  |
Number of shares outstanding (in shares) | 19,242,741 |  |  |
Stated capital | $ 481 |  |  | 535
Recurring redemption date term | 5 years |  |  |
Series AL |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued (in shares) | 1,489,288 |  |  |
Number of shares outstanding (in shares) | 1,489,288 |  |  |
Stated capital | $ 37 |  |  | 43
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 |  |  |
Number of shares issued (in shares) | 8,861,751 |  |  |
Number of shares outstanding (in shares) | 8,861,751 |  |  |
Stated capital | $ 203 |  |  | 228
Recurring redemption date term | 5 years |  |  |
Series AN |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued (in shares) | 950,322 |  |  |
Number of shares outstanding (in shares) | 950,322 |  |  |
Stated capital | $ 22 |  |  | 23
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 AQ |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Annual dividend rate | 6.538% |  |  |
Redemption price (in cad per share) | $ 25.00 |  |  |
Number of shares issued (in shares) | 7,727,909 |  |  |
Number of shares outstanding (in shares) | 7,727,909 |  |  |
Stated capital | $ 191 |  |  | 201
Recurring redemption date term | 5 years |  |  |
Series AR |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued (in shares) | 0 |  |  |
Number of shares outstanding (in shares) | 0 |  |  |
Stated capital | $ 0 |  |  | $ 0
Recurring redemption date term | 5 years |  |  |
Series AR | September 30, 2028 And Every Five Years Thereafter |  |  |  |
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 |  |  |

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