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, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 38,946 $ 38,041
Less: Accumulated depreciation and amortization (20,954) (20,147)
Property, plant and equipment, net 17,992 17,894
Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,629 6,344
Aircraft (including aircraft under capital leases) [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,748 15,164
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,128 1,122
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,236 3,138
Building and leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,096 3,049
Plant Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 7,160 7,010
Technology equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,629 1,675
Equipment under operating leases [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 53 69
Construction-in-progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 267 $ 470