Quarterly report pursuant to Section 13 or 15(d)

Property Plant and Equipment (Detail)

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Property Plant and Equipment (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 40,945,000,000   $ 40,945,000,000   $ 40,620,000,000
Less: Accumulated depreciation and amortization (22,975,000,000)   (22,975,000,000)   (22,339,000,000)
Property, plant and equipment, net 17,970,000,000   17,970,000,000   18,281,000,000
Impairment charges on property plant and equipment 0 $ 0 0 $ 0  
Vehicles [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 7,667,000,000   7,667,000,000   7,542,000,000
Aircraft (including aircraft under capital leases) [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 15,808,000,000   15,808,000,000   15,801,000,000
Land [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 1,190,000,000   1,190,000,000   1,145,000,000
Buildings [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 3,225,000,000   3,225,000,000   3,276,000,000
Building and leasehold improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 3,319,000,000   3,319,000,000   3,266,000,000
Plant Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 7,630,000,000   7,630,000,000   7,649,000,000
Technology equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 1,678,000,000   1,678,000,000   1,608,000,000
Equipment under operating leases [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 30,000,000   30,000,000   34,000,000
Construction-in-progress [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 398,000,000   $ 398,000,000   $ 299,000,000