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, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 47,204 $ 43,674
Less: Accumulated depreciation and amortization (26,216) (24,874)
Property, plant and equipment, net 20,988 18,800
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 9,124 8,638
Aircraft    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,708 15,653
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,568 1,397
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,789 3,439
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,796 3,612
Plant equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 8,850 8,430
Technology equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,858 1,741
Equipment under operating leases    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 29 29
Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,482 $ 735