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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 |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2023 | Oct. 30, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Nov. 01, 2023 | Dec. 31, 2021
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 |  |  | $ 361.0 |  |  | $ 659.0 | $ 711.0 | $ 2,143.0 |  |  |
Payment for Purchase of Warrants |  |  | $ 600.0 |  |  | $ 0.0 | $ 600.0 | $ 0.0 |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  |  |  |  | 29,388,000 |  | 112,489,000 |  |
Shares outstanding (in shares) |  |  | 1,885,559,000 |  |  |  | 1,885,559,000 |  | 1,909,190,000 |  | 2,001,211,000
Issued capital |  |  | $ 16,146.0 |  |  |  | $ 16,146.0 |  | $ 16,320.0 |  | $ 17,016.0
Common shares | Renewed NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  |  |  |  | 29,400,000 |  |  |  |
NCIB, shares repurchased, price per share (in CAD per share) |  |  |  |  |  |  | $ 24.19 |  |  |  |
NCIB, shares redeemed, amount |  |  |  |  |  |  | $ 711.0 |  |  |  |
NCIB, reduction to contributed surplus |  |  |  |  |  |  | $ 460.0 |  |  |  |
Common shares | Potential ordinary share transactions | Renewed NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) |  | 92,500,000 |  |  |  |  |  |  |  | 133,000,000 |
Purchase of Common Shares Under NCIB (in shares) |  | 3,300,000 |  |  |  |  |  |  |  |  |
NCIB, shares redeemed, amount |  | $ 89.0 |  |  |  |  |  |  |  |  |
Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 45,200,000 |  |  |  | 45,200,000 |  | 43,100,000 |  |
Preference 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 |  |  | 6.29% | 6.29% | 5.86% |  |  |  |  |  |
Common Share Warrants |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 7,921,000 |  |  |  | 7,921,000 |  | 55,720,000 |  | 65,119,000
Issued capital |  |  | $ 26.0 |  |  |  | $ 26.0 |  | $ 184.0 |  | $ 215.0
Exercise price of warrants issued (in CAD per share) | $ 6.54 |  |  |  |  |  | $ 6.54 |  |  |  |
Purchased and cancelled (in shares) | 45,500,000 |  |  |  |  |  | 45,485,000 |  | 0 |  |
Purchased and Cancelled | $ 711.0 |  |  |  |  |  | $ 151.0 |  | $ 0.0 |  |
Warrants purchase price (in CAD per share) | $ 22.18 |  |  |  |  |  |  |  |  |  |
Decrease through repurchase and cancellation of warrants, equity | $ 560.0 |  |  |  |  |  |  |  |  |  |
Decrease through repurchase and cancellation of warrants, transaction costs, equity | $ 2.0 |  |  |  |  |  |  |  |  |  |
Payment for Purchase of Warrants |  |  | $ 600.0 |  |  |  |  |  |  |  |

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