Income Taxes - Components of Our Net Deferred Tax Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
State	$ 13	$ 14
Foreign	92	72
Tax credits	83	89
Postretirement benefits other than pensions	55	54
Pensions	48	50
Bad debts	3	2
Sales allowances	7	8
Payroll and other accruals	39	34
Other accruals	50	58
Valuation allowance	(145)	(127)
Total deferred tax assets	245	254
Tax over book depreciation	53	40
Total deferred tax liabilities	53	40
Net deferred tax assets	$ 192	$ 214