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, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 37,688 $ 36,541
Less: Accumulated depreciation and amortization (19,859) (18,920)
Property, plant and equipment, net 17,829 17,621
Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,095 5,981
Aircraft (including aircraft under capital leases) [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,144 14,616
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,119 1,114
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,131 3,095
Building and leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,016 2,943
Plant Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,933 6,803
Technology equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,674 1,593
Equipment under operating leases [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 78 93
Construction-in-progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 498 $ 303