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	(13)	0	0	0	0	(13)	(13)	0
Other comprehensive income	14	0	0	0	14	0	14	0
Impact of change in accounting policy	1	0	0	0	0	1	1	0
Balance at Mar. 31, 2018	(2,740)	1	526	(296)	6	(2,976)	(2,739)	(1)
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	(52)	0	0	0	0	(52)	(52)	0
Other comprehensive income	0
Balance at Mar. 31, 2019	$ (2,966)	$ 1	$ 526	$ (296)	$ (18)	$ (3,177)	$ (2,964)	$ (2)