Income Taxes - Components of Our Net Deferred Tax Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S. federal	$ 0	$ 0
State	14	15
Foreign	72	75
Tax credit benefits	89	86
Postretirement benefits other than pensions	54	55
Pensions	50	56
Bad debts	2	2
Sales allowances	8	7
Payroll and other accruals	34	38
Other accruals	55	58
Valuation allowance	(127)	(139)
Total deferred tax assets	251	253
Tax over book depreciation	40	51
Total deferred tax liabilities	40	51
Net deferred tax assets	$ 211	$ 202