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Property, Plant and Equipment - Summary of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 5,691 $ 5,809
Buildings 3,143 3,329
Computer equipment and other assets 2,097 2,016
Payments on account 514 634
Land 351 390
Subtotal 11,796 12,178
Less-accumulated depreciation (4,928) (4,505)
Property, Plant and Equipment, Net, Total $ 6,868 $ 7,673