CONSOLIDATED STATEMENTS OF MEMBER'S/STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	ACCUMULATED DEFICIT	MEMBER'S EQUITY
Balance at beginning of period at Dec. 31, 2016				$ (387)
MEMBER'S EQUITY
Net (loss) income	$ 425				$ 425
Net other comprehensive (loss) income	80			80
Balance at end of period at Oct. 31, 2017				(307)		$ 19,617
Balance at beginning of period at Dec. 31, 2016		$ 4	$ 19,800		(8,500)
STOCKHOLDERS' EQUITY
Common stock issued under employee stock benefit plans and other			30
Share-based compensation			102
Balance at end of period at Oct. 31, 2017	11,554	$ 4	$ 19,932		(8,075)
MEMBER'S EQUITY
Net (loss) income	(141)					(141)
Net other comprehensive (loss) income	18			18
Contributions						28
Distributions						(250)
Balance at end of period at Dec. 31, 2017				18		19,254
Balance at end of period at Dec. 31, 2017	19,272
MEMBER'S EQUITY
Net (loss) income	341					341
Net other comprehensive (loss) income	(195)			(195)
Purchase price accounting adjustments						(5)
Distributions						(1,545)
Balance at end of period at Dec. 31, 2018				(171)		18,048
Balance at end of period at Dec. 31, 2018	17,877
MEMBER'S EQUITY
Net (loss) income	(3,201)					(3,201)
Net other comprehensive (loss) income	(8)			(8)
Distributions						(1,084)
Balance at end of period at Dec. 31, 2019				$ (179)		$ 13,724
Balance at end of period at Dec. 31, 2019	$ 13,545
MEMBER'S EQUITY
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-02					(39)
Cumulative effect of adoption of ASU | Accounting Standards Update 2014-09					$ 9