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
Mar. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 36,885 $ 36,541
Less: Accumulated depreciation and amortization (19,271) (18,920)
Property, plant and equipment, net 17,614 17,621
Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,954 5,981
Aircraft (including aircraft under capital leases) [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 14,763 14,616
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,110 1,114
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,105 3,095
Building and leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,985 2,943
Plant Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,863 6,803
Technology equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,642 1,593
Equipment under operating leases [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 89 93
Construction-in-progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 374 $ 303