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Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Postretirement benefits $ 51 $ 122
Intangible assets (1,833) (2,110)
Investments in non-US subsidiaries (220) (223)
Fixed assets, net 434 (140)
Inventories 155 111
Foreign tax credits 312 343
Other, net 610 456
Net deferred tax assets (liabilities) $ (491) $ (1,441)