Income Taxes (Provision For Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal	$ 732	$ 786	$ 533
States and Puerto Rico	62	63	56
Total current provision	794	849	589
Deferred provision (benefit)	22	(199)	(27)
Provision for income taxes	$ 816	$ 650	$ 562