Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 32	$ 39	$ 100	$ 113
Other comprehensive income (loss):
Currency translation adjustments	(22)		(21)	(18)
Comprehensive income	$ 10	$ 39	$ 79	$ 95