Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 122	$ 117
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(55)	20
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	2	1
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	2	2
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	11	0
Other comprehensive income, net of tax	(40)	23
Comprehensive income	$ 82	$ 140