Consolidated Statements of Stockholders' Equity Statement - 3 months ended Mar. 31, 2018 - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, December 31, 2017 at Dec. 31, 2017	$ 3,067	$ 0	$ (15)	$ 9,661	$ (6,552)	$ (106)	$ 79
Treasury stock transactions	(7)	0	(7)	0	0	0	0
Stock-based compensation expense	41	0	0	41	0	0	0
Effects of the Merger	(98)	0	22	(120)	0	0	0
Contribution from the noncontrolling interest	2	0	0	0	0	0	2
Distribution to the noncontrolling interest	(2)	0	0	0	0	0	(2)
Net loss	(594)	0	0	0	(598)	0	4
Other comprehensive income	38	0	0	0	0	36	2
Balance, March 31, 2018 at Mar. 31, 2018	$ 2,447	$ 0	$ 0	$ 9,582	$ (7,150)	$ (70)	$ 85