Income Taxes Income Tax Expense (Benefit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Income Tax Expense (Benefit) [Abstract]
Total current income tax expense	$ 273	$ 106	$ 114
Total deferred income tax (benefit)	(72)	(7)	(196)
Total income tax expense (benefit)	201	99	(82)
United States
Current Income Tax Expense (Benefit) [Abstract]
Federal	85	(2)	40
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	(2)	95	(174)
State and local
Current Income Tax Expense (Benefit) [Abstract]
State and local	2	1	5
Deferred Income Tax Expense (Benefit) [Abstract]
State and local	8	(15)	(4)
Non-United States
Current Income Tax Expense (Benefit) [Abstract]
Non-United States	186	107	69
Deferred Income Tax Expense (Benefit) [Abstract]
Non-United States	$ (78)	$ (87)	$ (18)