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Share Capital and Warrants - First Preferred Shares (Details) - Preferred Shares - CAD ($)
shares in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Number of Common Shares    
Outstanding, Beginning of Year (in shares) 26 36
Preferred shares redeemed (in shares) (14) (10)
Outstanding, End of Period (in shares) 12 26
Amount    
Outstanding, Beginning of Year $ 356 $ 519
Preferred Shares Redeemed (243) (163)
Outstanding, End of Period $ 113 $ 356