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Share Capital and Warrants - Issued and Outstanding - Warrants (Details) - Common Share Warrants - CAD ($)
shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Number of Warrants    
Outstanding, Beginning of Year (in shares) 65,119 0
Issued Under the Arrangement, net of Issuance Costs (in shares) 0 65,433
Issued Upon Exercise of Warrants (in shares) (6,571) (314)
Outstanding, End of Period (in shares) 58,548 65,119
Amount    
Outstanding, Beginning of Year $ 215 $ 0
Issued Under the Arrangement, Net of Issuance Costs 0 216
Issued Upon Exercise of Warrants (21) (1)
Outstanding, End of Period $ 194 $ 215