Income Taxes - Reconciliation of Income Taxes Computed at Statutory U.S. Federal Income Tax Rate to Income Tax Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense computed at the statutory U.S. federal income tax rate	$ 37	$ 117	$ 144
Foreign income taxed at different rates	19	(48)	(42)
Transition Tax under Tax Cuts and Jobs Act (TCJA)	11	43	0
Remeasurement of estimated tax on unremitted earnings	0	53	0
State and local taxes on income, net of U.S. federal income tax benefit	(6)	(2)	3
Changes in valuation allowance for tax loss carryforwards and credits	0	(1)	18
Investment and R&D tax credits	(12)	(6)	(6)
Foreign earnings subject to U.S. federal income tax	9	(74)	(101)
Tax contingencies	1	(1)	(7)
Other	4	(10)	(13)
Income tax expense	$ 63	$ 71	$ (4)