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Share Capital and Warrants - Issued and Outstanding - Warrants (Details) - Common Share Warrants - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Number of Warrants    
Outstanding, Beginning of Year 65,119 0
Issued Under the Arrangement, Net of Issuance Costs (Note 5) 0 65,433
Issued Upon Exercise of Warrants (9,399) (314)
Outstanding, End of Year 55,720 65,119
Amount    
Outstanding, Beginning of Year $ 215 $ 0
Issued Under the Arrangement, Net of Issuance Costs (Note 5) 0 216
Issued Upon Exercise of Warrants (31) (1)
Outstanding, End of Year $ 184 $ 215