Consolidated Statements of Changes in Stockholder's Equity (USD $) In Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance, Beginning at Dec. 31, 2010	$ 10,391	$ 136	$ 5,198	$ 5,468	$ (677)	$ 266
Net income (loss)	638			649		(11)
Other comprehensive income (loss), net of tax	121				121
Compensation expense - restricted stock units	5		5
Other	14					14
Net change	778		5	649	121	3
Balance, Ending at Sep. 30, 2011	11,169	136	5,203	6,117	(556)	269
Balance, Beginning at Dec. 31, 2011	11,830	136	5,989	6,246	(809)	268
Net income (loss)	491			506		(15)
Other comprehensive income (loss), net of tax	369				369
Other	6					6
Net change	866			506	369	(9)
Balance, Ending at Sep. 30, 2012	$ 12,696	$ 136	$ 5,989	$ 6,752	$ (440)	$ 259