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Share Capital and Warrants - Issued and Outstanding - Common Shares (Detail) - Common shares - CAD ($) shares in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Number of Common Shares |  |  |
Outstanding, Beginning of Year (in shares) | 1,871,868 | 1,909,190 | 1,909,190
Issued Upon Exercise of Warrants (in shares) | 3,820 | 2,610 |
Issued Under Stock Option Plans (in shares) | 5,017 | 3,679 |
Purchases of common shares under NCIB (in shares) | (51,235) | (43,611) |
Outstanding, End of Period (in shares) | 1,829,470 |  | 1,871,868
Amount |  |  |
Outstanding, Beginning of Year | $ 16,031 | $ 16,320 | $ 16,320
Issued Upon Exercise of Warrants | 38 | 26 |
Issued Under Stock Option Plans | 67 | 58 |
Purchase of Common Shares Under NCIB | (439) | $ (373) |
Outstanding, End of Period | $ 15,697 |  | $ 16,031

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