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Share Capital and Warrants - First Preferred Shares (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Amount    
Preferred Shares Redeemed $ (87)  
Preferred Shares    
Number of Common Shares    
Outstanding, beginning of year (in shares) 36 36
Preferred shares redeemed (in shares) (10) 0
Outstanding, end of year (in shares) 26 36
Amount    
Outstanding, Beginning of Year $ 519 $ 519
Preferred Shares Redeemed (163) 0
Outstanding, End of Year $ 356 $ 519