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, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 39,293 $ 39,151
Less: Accumulated depreciation and amortization (21,524) (21,190)
Property, plant and equipment, net 17,769 17,961
Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,835 6,762
Aircraft (including aircraft under capital leases) [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,774 15,772
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,167 1,163
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,267 3,260
Building and leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,125 3,116
Plant Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 7,315 7,221
Technology equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,583 1,569
Equipment under operating leases [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 43 44
Construction-in-progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 184 $ 244