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Share Capital and Warrants - Issued and Outstanding - Preferred Shares (Details) - Preferred Shares - CAD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend Rate (percent) | 4.37% | 4.57% | 5.21% |  |  |
Shares outstanding (in shares) | 12,000 |  |  | 12,000 | 26,000 | 36,000
Issued capital | $ 113 |  |  | $ 113 | $ 356 | $ 519
Purchased and cancelled (in shares) |  |  |  | (14,000) | (10,000) |
Purchased and Cancelled |  |  |  | $ (243) | $ (163) |
Series 1 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend Rate (percent) |  |  |  | 2.58% |  |
Shares outstanding (in shares) | 10,740 |  |  | 10,740 |  |
Series 2 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend Rate (percent) |  |  |  | 4.39% |  |
Shares outstanding (in shares) | 1,260 |  |  | 1,260 |  |

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