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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net (loss) income	$ (188)	$ 64	$ (443)	$ (183)
Weighted average basic shares (in shares)	323.1	317.7	321.9	317.0
Effect of dilutive securities (in shares)	0.0	3.8	0.0	0.0
Weighted average diluted shares (in shares)	323.1	321.5	321.9	317.0
Basic (in dollars per share)	$ (0.58)	$ 0.20	$ (1.38)	$ (0.58)
Diluted (in dollars per share)	$ (0.58)	$ 0.20	$ (1.38)	$ (0.58)

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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