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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 5,759 $ 5,809
Buildings 3,307 3,329
Computer equipment and other assets 2,055 2,016
Payments on account 615 634
Land 358 390
Subtotal 12,094 12,178
Less-accumulated depreciation 4,674 4,505
Property, Plant and Equipment, Net, Total $ 7,420 $ 7,673