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(Loss) Earnings Per Share - Computed Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (129)	$ 130	$ 64	$ (247)	$ (373)	$ (393)	$ (320)	$ (268)	$ (182)	$ (1,354)	$ 569
Weighted average basic shares (in shares)									318.0	277.5	296.6
Effect of dilutive securities (in shares)									0.0	0.0	1.8
Weighted average diluted shares									318.0	277.5	298.4
Basic (in dollars per share)	$ (0.40)	$ 0.41	$ 0.20	$ (0.78)	$ (1.31)	$ (1.44)	$ (1.18)	$ (0.97)	$ (0.57)	$ (4.88)	$ 1.92
Diluted (in dollars per share)		$ 0.40	$ 0.20						$ (0.57)	$ (4.88)	$ 1.91

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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