Consolidated Statements of Changes in Stockholder's Equity (Unaudited) (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance, Beginning at Dec. 31, 2010	$ 10,391	$ 136	$ 5,198	$ 5,468	$ (677)	$ 266
Net income (loss)	470			477		(7)
Other comprehensive income (loss), net of tax	64				64
Compensation expense - restricted stock units	1		1
Other	11					11
Net change	546		1	477	64	4
Balance, Ending at Jun. 30, 2011	10,937	136	5,199	5,945	(613)	270
Balance, Beginning at Dec. 31, 2011	11,830	136	5,989	6,246	(809)	268
Net income (loss)	373			382		(9)
Other comprehensive income (loss), net of tax	136				136
Compensation expense - restricted stock units	(4)		(4)
Other	(6)					(6)
Net change	499		(4)	382	136	(15)
Balance, Ending at Jun. 30, 2012	$ 12,329	$ 136	$ 5,985	$ 6,628	$ (673)	$ 253