Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Income [Abstract]
Net tax effect on loss from discontinued operations	$ (11)	$ 10	$ (23)	$ (5)