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, 2011	$ 1,461	$ 1	$ 1,082	$ 338	$ 21	$ 19
Balance (in shares) at Dec. 31, 2011		56,361,155
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	43			18		25
Distributions to noncontrolling interest	(14)					(14)
Stock compensation expense	2		2
Stock issued under share-based payment plans	(2)		(2)
Stock issued under share-based payment plans (in shares)		284,942
Conversion option related to Convertible note issuance, net	33		33
Recognition of deferred taxes related to Convertible notes	2		2
Balance at Jun. 30, 2012	1,525	1	1,117	356	21	30
Balance (in shares) at Jun. 30, 2012		56,646,097
Balance at Dec. 31, 2012	1,562	1	1,127	372	26	36
Balance (in shares) at Dec. 31, 2012	56,975,991	56,975,991
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	154			142	(12)	24
Distributions to noncontrolling interest	(35)					(35)
Stock compensation expense	4		4
Stock issued under share-based payment plans (in shares)		129,660
Recognition of deferred taxes related to Convertible notes	2		2
Balance at Jun. 30, 2013	$ 1,687	$ 1	$ 1,133	$ 514	$ 14	$ 25
Balance (in shares) at Jun. 30, 2013	57,105,651	57,105,651