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Fixed Assets - Components of Fixed Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross $ 20,121 $ 18,000
Property plant and equipment, net 8,475 8,260
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 195 219
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 2,709 2,413
Accumulated depreciation (1,147) (945)
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 17,217 15,368
Accumulated depreciation $ (10,499) $ (8,795)