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Share Capital and Warrants - Treasury Shares (Details) - Treasury Shares
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
Number of Common Shares  
Outstanding, beginning of year (in shares) | shares 0
Market Purchase (in shares) | shares 2,000
Outstanding, end of year (in shares) | shares 2,000
Amount  
Outstanding, Beginning of Year | $ $ 0
Purchase of Common Shares Under Employee Benefit Plan | $ 43
Outstanding, End of Year | $ $ 43