Income Tax - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal income tax at the U.S. federal statutory rate	$ 17	$ 21	$ 54	$ 61
Foreign income tax rate differential	(1)	(2)	(3)	(4)
State income tax, net of federal benefit	1	1	2	2
Nondeductible expenses/foreign inclusions	1	1	3	5
Foreign tax credit	(1)	(1)	(3)	(4)
Other			1	1
Provision for income taxes	$ 17	$ 20	$ 54	$ 61