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Property, Plant and Equipment - Summary of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 5,699 $ 5,691
Buildings 3,124 3,143
Computer equipment and other assets 2,113 2,097
Payments on account 520 514
Land 370 351
Subtotal 11,826 11,796
Less-accumulated depreciation (5,041) (4,928)
Property, Plant and Equipment, Net, Total $ 6,785 $ 6,868