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
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 51,200 $ 48,726
Less: Accumulated depreciation and amortization (27,299) (26,608)
Property, plant and equipment, net 23,901 22,118
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,435 9,365
Aircraft    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 16,811 16,248
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,777 1,582
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,195 4,035
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,114 3,934
Plant equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,952 9,387
Technology equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,001 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 $ 2,915 $ 2,239