- Reconciliation of Income Taxes Computed at Statutory U.S. Federal Income Tax Rate to Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Reconciliation Of Income Taxes Computed At Statutory U S Federal Income Tax Rate To Income Tax Expense [Abstract]
Income tax expense computed at the statutory U.S. federal income tax rate	$ 140	$ 120	$ 113
Foreign income taxed at different rates	(21)	(21)	(21)
Taxes on repatriation of dividends	4	9	8
Remeasurement of estimated tax on unremitted earnings	0	(17)	0
State and local taxes on income, net of U.S. federal income tax benefit	8	6	4
Changes in valuation allowance for tax loss carryforwards and credits	12	27	(91)
Foreign tax holidays	(6)	(5)	(5)
Investment and R&D tax credits	(10)	(8)	(1)
Foreign earnings subject to U.S. federal income tax	7	5	23
Adjustment of prior years taxes	(2)	(1)	(5)
Impact of foreign tax law changes	0	(3)	(1)
Tax contingencies	0	6	(6)
Other	(1)	4	1
Income tax expense	$ 131	$ 122	$ 19