Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Condensed Consolidated Statements Of Comprehensive Income Parenthetical [Line Items]
Foreign currency translation adjustments, tax	$ (2)	$ (2)	$ 7	$ 2
Available-for-sale Securities, Tax	(2)	0	(6)	0
Changes in the fair value of cash flow hedges, tax	1	0	(4)	1
Defined benefit pension plan adjustments, tax	$ 0	$ (1)	$ (16)	$ (2)