Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 4	$ (1)	$ 3	$ 0
Unrealized gains (losses), tax	3	2	(5)	1
Reclassification adjustment for losses (gains) included in other income (expense), net, tax	$ (1)	$ (1)	$ (1)	$ (1)