Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Original cost	$ 78,567	$ 79,053
Property, plant and equipment - net	51,607	52,967
Impairment of Long-Lived Assets Held-for-use	732	242
Amortization of Leased Asset	6,696	6,097	6,063
Land And Improvements, Buildings, Structures And Related Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	2,504	2,485
Property, plant and equipment - net	1,025	999
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Original cost	1,353	1,466
Less accumulated depreciation and amortization	342	451
Equipment Leased to Other Party [Member] | Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	50,337	49,954
Property, plant and equipment - net	34,938	36,231
Equipment Leased to Other Party [Member] | Vehicles [Member]
Property, Plant and Equipment [Line Items]
Original cost	14,656	15,952
Property, plant and equipment - net	8,312	8,634
Equipment Leased to Other Party [Member] | Railroad Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	4,636	4,180
Property, plant and equipment - net	3,129	2,744
Equipment Leased to Other Party [Member] | Construction And Manufacturing [Member]
Property, Plant and Equipment [Line Items]
Original cost	2,916	3,055
Property, plant and equipment - net	1,955	2,069
Equipment Leased to Other Party [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	3,518	3,427
Property, plant and equipment - net	$ 2,248	$ 2,290
Minimum [Member] | Land And Improvements, Buildings, Structures And Related Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
Minimum [Member] | Equipment Leased to Other Party [Member] | Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	20 years
Minimum [Member] | Equipment Leased to Other Party [Member] | Vehicles [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
Minimum [Member] | Equipment Leased to Other Party [Member] | Railroad Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	4 years
Minimum [Member] | Equipment Leased to Other Party [Member] | Construction And Manufacturing [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
Minimum [Member] | Equipment Leased to Other Party [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	7 years
Maximum [Member] | Land And Improvements, Buildings, Structures And Related Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	35 years
Maximum [Member] | Equipment Leased to Other Party [Member] | Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	20 years
Maximum [Member] | Equipment Leased to Other Party [Member] | Vehicles [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	20 years
Maximum [Member] | Equipment Leased to Other Party [Member] | Railroad Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	50 years
Maximum [Member] | Equipment Leased to Other Party [Member] | Construction And Manufacturing [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	30 years
Maximum [Member] | Equipment Leased to Other Party [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	27 years