Quarterly report pursuant to Section 13 or 15(d)

Property Plant and Equipment (Detail)

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Property Plant and Equipment (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 53,046 $ 48,726
Less: Accumulated depreciation and amortization (27,667) (26,608)
Property, plant and equipment, net 25,379 22,118
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,500 9,365
Aircraft    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 17,245 16,248
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,783 1,582
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,615 4,035
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,095 3,934
Plant equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 10,054 9,387
Technology equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,062 1,907
Equipment under operating leases    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 0 29
Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 3,692 $ 2,239