Income Taxes (Analysis of the Provision for Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit) [Abstract]
United States	$ 43	$ 368	$ 313
State	32	95	(5)
Other countries	311	337	297
Total	386	800	605
United States	254	(15)	99
State	29	(24)	(5)
Other countries	(9)	27	47
Total	274	(12)	141
Total provision for income taxes	$ 660	$ 788	$ 746