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Earnings (Loss) Per Share - Computed Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net loss $ 130 $ (393) $ (53) $ (981)
Weighted average basic shares (in shares) 318.0 272.4 317.3 274.3
Effect of dilutive securities (in shares) 3.3 0.0 0.0 0.0
Weighted average diluted shares (in shares) 321.3 272.4 317.3 274.3
Basic (in dollars per share) $ 0.41 $ (1.44) $ (0.17) $ (3.58)
Diluted (in dollars per share) $ 0.40 $ (1.44) $ (0.17) $ (3.58)