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Share Capital and Warrants - Issued and Outstanding - Warrants (Details) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Jun. 14, 2023
Dec. 31, 2024
Dec. 31, 2023
Amount      
Purchased and Cancelled   $ (87)  
Common Share Warrants      
Number of Warrants      
Outstanding, beginning of year (in shares)   7,625 55,720
Exercised (in shares)   (3,982) (2,610)
Purchases and cancelled (in shares) (45,500) 0 (45,485)
Outstanding, end of year (in shares)   3,643 7,625
Amount      
Outstanding, Beginning of Year   $ 25 $ 184
Issued Upon Exercise of Warrants   (13) (8)
Purchased and Cancelled $ (711) 0 (151)
Outstanding, End of Year   $ 12 $ 25