Consolidated Statements of Changes Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid In Capital	Net Former Parent Investment	Net Former Parent Investment Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Accumulated Other Comprehensive Loss	Non-controlling Interests
Balance at beginning of period at Dec. 31, 2017	$ 957	$ 1	$ 0	$ 0	$ 844	$ 1	$ 0	$ (8)	$ 122
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net loss	(294)				(95)		(181)		(19)
Net change in cash flow hedges	1							1
Foreign currency translation	(10)							(9)	(1)
Pension liability net of tax	(2)							(3)	1
Reclassification of parent's net investment and issuance of common shares	19		87	1,935	(2,003)
Stock based compensation expense	3			3
Net transfers from Former Parent	1,252				1,253				(1)
Balance at end of period at Dec. 31, 2018	1,927		87	1,938	0		(181)	(19)	101
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net loss	(522)						(500)		(22)
Foreign currency translation	(24)							(24)
Pension liability net of tax	(1)							(1)
Stock based compensation expense	5			5
Issuance of common stock	403		24	379
Purchase of minority interest	0			(14)					14
Equity component of issuance of convertible notes, net of taxes	35			35
Dividend	(5)								(5)
Balance at end of period at Dec. 31, 2019	1,818		111	2,343	0		(681)	(44)	89
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net loss	(544)						(545)		1
Foreign currency translation	48							47	1
Pension liability net of tax	(1)							(1)
Stock based compensation expense	6			6
Business divestiture	(88)							3	(91)
Balance at end of period at Dec. 31, 2020	$ 1,239		$ 111	$ 2,349	$ 0		$ (1,226)	$ 5	$ 0