Condensed Consolidated Statement of Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Parent [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2017	$ (2,742)	$ 1	$ 526	$ (296)	$ (8)	$ (2,964)	$ (2,741)	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(34)	0	0	0	0	(35)	(35)	1
Other comprehensive income	(2)	0	0	0	(2)	0	(2)	0
Foreign currency translation adjustments	(2)
Impact of change in accounting policy	1	0	0	0	0	1	1	0
Balance at Jun. 30, 2018	(2,777)	1	526	(296)	(10)	(2,998)	(2,777)	0
Balance at Mar. 31, 2018	(2,740)	1	526	(296)	6	(2,976)	(2,739)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(21)	0	0	0	0	(22)	(22)	1
Other comprehensive income	(16)	0	0	0		0	(16)	0
Foreign currency translation adjustments	(16)
Balance at Jun. 30, 2018	(2,777)	1	526	(296)	(10)	(2,998)	(2,777)	0
Balance at Dec. 31, 2018	(2,914)	1	526	(296)	(18)	(3,125)	(2,912)	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(159)	0	0	0	0	(160)	(160)	1
Other comprehensive income	(8)	0	0	0	(8)	0	(8)	0
Foreign currency translation adjustments	(8)
Balance at Jun. 30, 2019	(3,081)	1	526	(296)	(26)	(3,285)	(3,080)	(1)
Balance at Mar. 31, 2019	(2,966)	1	526	(296)	(18)	(3,177)	(2,964)	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(107)	0	0	0	0	(108)	(108)	1
Other comprehensive income	(8)	0	0	0		0	(8)	0
Foreign currency translation adjustments	(8)
Balance at Jun. 30, 2019	$ (3,081)	$ 1	$ 526	$ (296)	$ (26)	$ (3,285)	$ (3,080)	$ (1)