Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Foreign currency translation adjustments, tax	$ (4)	$ 17	$ (13)	$ (21)
Unrealized gains (losses), tax	3	0	4	(3)
Reclassification adjustment for losses (gains) included in net income, tax effect	$ 0	$ 0	$ 0	$ 1