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Share Capital and Warrants - Issued and Outstanding - Common Shares (Details) - Common shares - CAD ($)
shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Number of Common Shares    
Outstanding, Beginning of Year (in shares) 1,825,038 1,871,868
Issued Under Stock Option Plans (in shares) 1,090 5,049
Purchases of common shares under NCIB (in shares) (60,537) (55,861)
Issued Upon Exercise of Warrants (in shares) 738 3,982
Outstanding, End of Period (in shares) 1,766,329 1,825,038
Amount    
Outstanding, Beginning of Year $ 15,659 $ 16,031
Issued Under Stock Option Plans 15 68
Purchase of Common Shares Under NCIB (519) (479)
Issued Upon Exercise of Warrants 7 39
Outstanding, End of Period $ 15,162 $ 15,659