CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 1,571	$ 1	$ 989	$ 566	$ (11)	$ 26
Beginning Balance (in shares) at Dec. 31, 2014		51,143,723
Increase (Decrease) in Stockholders' Equity
Total comprehensive (loss) income	(32)			(41)	1	8
Distributions to noncontrolling interest	(4)					(4)
Stock compensation expense	4		4
Stock issued under share-based payment plans	2		2
Stock issued under share-based payment plans (in shares)		160,693
Repurchase of Common stock	(1)	$ (1)	5	(5)
Repurchase of Common stock (in shares)		(1,574,252)
Conversion of Convertible Notes	(15)	$ 1	(16)
Conversion of Convertible Notes (in shares)		10,075,653
Recognition of deferred taxes related to Convertible notes	2		2
Ending Balance at Jun. 30, 2015	1,527	$ 1	986	520	(10)	30
Ending Balance (in shares) at Jun. 30, 2015		59,805,817
Beginning Balance at Dec. 31, 2015	$ 1,348	$ 1	911	416	(10)	30
Beginning Balance (in shares) at Dec. 31, 2015	55,007,983	55,007,983
Increase (Decrease) in Stockholders' Equity
Total comprehensive (loss) income	$ (39)			(42)	0	3
Stock compensation expense	4		4
Stock issued under share-based payment plans	(9)		(9)
Stock issued under share-based payment plans (in shares)		28,627
Repurchase of Common stock	(23)	$ 0	(23)	0
Repurchase of Common stock (in shares)		(1,508,772)
Ending Balance at Jun. 30, 2016	$ 1,281	$ 1	$ 883	$ 374	$ (10)	$ 33
Ending Balance (in shares) at Jun. 30, 2016	53,527,838	53,527,838