Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (142)	$ (66)	$ (290)	$ (103)
Other comprehensive income (loss), before tax:
Change in cumulative translation adjustment	(2)	(15)	(13)	(4)
Other comprehensive income (loss), before tax	(2)	(15)	(13)	(4)
Expense for taxes	0	0	0	0
Other comprehensive income (loss), net of tax	(2)	(15)	(13)	(4)
Comprehensive loss	(144)	(81)	(303)	(107)
Less: Comprehensive loss attributable to non-controlling interest	(7)	(5)	(18)	(7)
Comprehensive loss attributable to controlling interest	(137)	(76)	(285)	(100)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	0	1	0	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	$ 0	$ 1	$ 0	$ (1)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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