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Property, Plant and Equipment - Summary of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 5,245 $ 5,385
Buildings 2,720 2,839
Computer equipment and other assets 2,197 2,131
Assets under construction and payments on account 933 672
Land 292 323
Subtotal 11,388 11,350
Less—accumulated depreciation (5,092) (4,914)
Property, Plant and Equipment, Net, Total $ 6,296 $ 6,436