CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at Dec. 31, 2012	$ 1,562	$ 1	$ 1,127	$ 372	$ 26	$ 36
Balance (in shares) at Dec. 31, 2012		56,975,991
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	112			90	(8)	30
Distributions to noncontrolling interest	(41)					(41)
Stock compensation expense	6		6
Stock issued under share-based payment plans (includes $6 of excess tax benefit)	1		1
Stock issued under share-based payment plans (in shares)		256,465
Recognition of deferred taxes related to Convertible notes	3		3
Balance at Sep. 30, 2013	1,643	1	1,137	462	18	25
Balance (in shares) at Sep. 30, 2013		57,232,456
Balance at Dec. 31, 2013	1,690	1	1,142	507	16	24
Balance (in shares) at Dec. 31, 2013	57,265,517	57,265,517
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	97			114	(22)	5
Stock compensation expense	6		6
Stock issued under share-based payment plans (includes $6 of excess tax benefit)	15		15
Stock issued under share-based payment plans (in shares)		537,520
Repurchase of common stock	(200)		(178)	(22)
Repurchase of common stock (in shares)		(6,962,695)
Conversion of Convertible notes	(4)		(4)
Recognition of deferred taxes related to Convertible notes	4		4
Balance at Sep. 30, 2014	$ 1,608	$ 1	$ 985	$ 599	$ (6)	$ 29
Balance (in shares) at Sep. 30, 2014	50,840,342	50,840,342