Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Postretirement benefits	$ 135	$ 253
Intangible assets	(2,186)	(2,869)
Investments in non-US subsidiaries	(224)	(271)
Fixed assets, net	(55)	(79)
Inventories	126	248
Other, net	554	838
Net deferred tax assets (liabilities)	$ (1,650)	$ (1,880)

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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