Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Differences between actual provisions for income taxes and provisions for income taxes at the U.S. federal statutory rate (35%)
Taxes on income at U.S. federal statutory rate	$ (140)	$ (153)	$ (118)
Foreign earnings subject to different tax rates	6		(1)
State income tax, net of federal benefit	(18)	(24)	(1)
Change in valuation allowance	149	179	575
Change in unrecognized tax benefits	(7)	(2)	(7)
Tax benefit resulting from other comprehensive income allocation		(37)
Other, net		1	2
Total	$ (10)	$ (34)	$ 450
Effective income tax rate	2.60%	7.70%	133.20%