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Share Capital and Warrants - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 28, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Oct. 30, 2024 | Dec. 31, 2022
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 |  | $ 732.0 |  |  | $ 361.0 | $ 1,337.0 | $ 711.0 |  |  |
Payment for Purchase of Warrants |  | $ 0.0 |  |  | $ 600.0 | $ 0.0 | $ 600.0 |  |  |
Common shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  |  |  | 51,235,000 | 43,611,000 |  |  |
Shares outstanding (in shares) |  | 1,829,470,000 |  |  |  | 1,829,470,000 |  | 1,871,868,000 |  | 1,909,190,000
Issued capital |  | $ 15,697.0 |  |  |  | $ 15,697.0 |  | $ 16,031.0 |  | $ 16,320.0
Common shares | Renewed NCIB |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  |  |  | 51,200,000 |  |  |  |
NCIB, shares repurchased, price per share (in CAD per share) |  |  |  |  |  | $ 25.60 |  |  |  |
NCIB, shares redeemed, amount |  |  |  |  |  | $ 1,300.0 |  |  |  |
NCIB, reduction to contributed surplus |  |  |  |  |  | 898.0 |  |  |  |
Average carrying value |  |  |  |  |  | 873.0 |  |  |  |
Taxes paid |  |  |  |  |  | $ 25.0 |  |  |  |
Common shares | Potential ordinary share transactions | Renewed NCIB |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) | 2,500,000 |  |  |  |  |  |  |  |  |
NCIB, shares redeemed, amount | $ 59.0 |  |  |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) | 68,900,000 |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  | 127,000,000 |
Stock Option Plan |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  | 48,700,000 |  |  |  | 48,700,000 |  | 45,500,000 |  |
Preferred Shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 36,000,000 |  |  |  | 36,000,000 |  |  |  |
Issued capital |  | $ 519.0 |  |  |  | $ 519.0 |  |  |  |
Expected dividend |  | 6.60% | 6.71% | 6.77% |  |  |  |  |  |
Common Share Warrants |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 3,805,000 |  |  |  | 3,805,000 |  | 7,625,000 |  | 55,720,000
Issued capital |  | $ 12.0 |  |  |  | $ 12.0 |  | $ 25.0 |  | $ 184.0
Exercise price of warrants issued (in CAD per share) |  |  |  |  |  | $ 6.54 |  |  |  |
Purchased and cancelled (in shares) |  |  |  |  |  | 0 |  | 45,485,000 |  |
Purchased and Cancelled |  |  |  |  |  | $ 0.0 |  | $ 151.0 |  |

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