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Share Capital and Warrants - Issued and Outstanding - Common Shares (Detail) - Common Shares - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Number of Common Shares    
Outstanding, beginning of year (in shares) 1,871,868 1,909,190
Issued Upon Exercise of Warrants 3,982 2,610
Issued Under Stock Option Plans 5,049 3,679
Purchase of Common Shares under NCIB (55,861) (43,611)
Outstanding, end of year (in shares) 1,825,038 1,871,868
Amount    
Outstanding, Beginning of Year $ 16,031 $ 16,320
Issued Upon Exercise of Warrants 39 26
Issued Under Stock Option Plans 68 58
Purchase of Common Shares under NCIB (479) (373)
Outstanding, End of Year $ 15,659 $ 16,031