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Common Shares - Earnings per Common Share (Details) - CAD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]      
Net earnings (loss) attributable to common shareholders $ 4 $ (576) $ (336)
Basic weighted average number of common shares outstanding (in shares) 271,000 271,000 275,000
Diluted weighted average number of common shares outstanding (in shares) 271,000 271,000 275,000
Net earnings (loss) per share attributable to common shareholders, basic (in CAD per share) $ 0.01 $ (2.13) $ (1.22)
Net earnings (loss) per share attributable to common shareholders, diluted (in CAD per share) $ 0.01 $ (2.13) $ (1.22)