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Consolidated Statement of Comprehensive (Loss) Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive Income (Loss) [Abstract]
Net (loss) income	$ (1,354)	$ 569	$ 189
Changes in fair value of derivative instruments, net of reclassifications into earnings, net of deferred taxes of $0, $(1), and $2 in 2020, 2019, and 2018, respectively	(2)	5	(3)
Total other comprehensive (loss) income	(2)	5	(3)
COMPREHENSIVE (LOSS) INCOME	$ (1,356)	$ 574	$ 186

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Comprehensive Income (Loss) [Abstract]

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