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Loss Per Share - Computed Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (247)	$ (268)
Weighted average basic shares (in shares)	316.3	277.2
Effect of dilutive securities (in shares)	0.0	0.0
Weighted average diluted shares (in shares)	316.3	277.2
Basic (in dollars per share)	$ (0.78)	$ (0.97)
Diluted (in dollars per share)	$ (0.78)	$ (0.97)

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