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Share Capital and Warrants - Issued and Outstanding - Warrants (Details) - Common Share Warrants - CAD ($)
shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Jun. 14, 2023
Sep. 30, 2023
Dec. 31, 2022
Number of Warrants      
Outstanding, Beginning of Year (in shares)   55,720 65,119
Issued Upon Exercise of Warrants (in shares)   (2,314) (9,399)
Purchased and cancelled (in shares) (45,500) (45,485) 0
Outstanding, End of Period (in shares)   7,921 55,720
Amount      
Outstanding, Beginning of Year   $ 184 $ 215
Issued Upon Exercise of Warrants   (7) (31)
Purchased and Cancelled $ (711) (151) 0
Outstanding, End of Period   $ 26 $ 184