Consolidated Statements Of Comprehensive Income (Loss) (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 of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ (1)	$ 4	$ (14)	$ (17)
Unrealized gains (losses), tax	(1)	(1)	3	(4)
Reclassification adjustment for losses (gains) included in other income (expense), net, tax	$ 0	$ 1	$ (1)	$ 2