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Share Capital and Warrants - Additional Information (Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 27, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Oct. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Nov. 07, 2024 | Dec. 31, 2023
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock |  |  |  | 20.00% |  |  |  |  |  |  |
NCIB, shares redeemed, amount |  | $ 918 | $ 732 | $ 1,281 | $ 1,337 |  |  |  |  |  |
Renewed NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average carrying value |  |  |  | $ 762 |  |  |  |  |  |  |
Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  | 24,900 |  | 24,900 |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  | 60,537 |  | 55,861 |  |  |  |  |
Common Shares Issued Under Employee Benefit Plan |  |  |  | $ 76 |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 1,766,329 |  | 1,766,329 |  | 1,825,038 |  |  |  |  | 1,871,868
Common shares | Paid in Surplus |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Shares Issued Under Employee Benefit Plan |  |  |  | $ (6) |  |  |  |  |  |  |
Common shares | Renewed NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  | 60,500 |  |  |  |  |  |  |
NCIB, shares repurchased, price per share (in CAD per share) |  |  |  | $ 20.75 |  |  |  |  |  |  |
NCIB, shares redeemed, amount |  |  |  | $ 1,300 |  |  |  |  |  |  |
NCIB, reduction to contributed surplus |  |  |  | 541 |  |  |  |  |  |  |
NCIB, reduction to retained earnings |  |  |  | 221 |  |  |  |  |  |  |
Average carrying value |  |  |  | 737 |  |  |  |  |  |  |
Taxes paid |  |  |  | $ 25 |  |  |  |  |  |  |
Common shares | Renewed NCIB | Potential ordinary share transactions |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  | 127,500 |
Purchase of Common Shares Under NCIB (in shares) | 17,000 |  |  |  |  |  |  |  |  |  |
NCIB, shares redeemed, amount | $ 409 |  |  |  |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) | 48,800 |  |  |  |  |  | 120,000 |  |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 12,000 |  | 12,000 |  | 26,000 |  |  |  |  | 36,000
Retained earnings |  | $ 107 |  | $ 107 |  |  |  |  |  |  |
Preferred Shares | Series 5 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  |  |  |  |  |  | 8,000 |  |
Preferred Shares | Series 7 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  |  |  |  |  | 6,000 |  |  |
Preferred Shares | Series 5 And 7 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
NCIB, shares redeemed, amount |  |  |  | $ 350 |  |  |  |  |  |  |
Preferred Shares, Price Per Share |  | $ 25.00 |  | $ 25.00 |  |  |  |  |  |  |
Common Share Warrants |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 2,905 |  | 2,905 |  | 3,643 |  |  |  |  | 7,625
Exercise price of warrants issued (in CAD per share) |  |  |  | $ 6.54 |  |  |  |  |  |  |

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