Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Original cost	$ 80,844	$ 75,034
Property, plant and equipment - net	53,673	51,419
Land and improvements, buildings, structures and related equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	2,624	3,110
Property, plant and equipment - net	1,074	1,499
Depreciable lives-new (in years), minimum	1
Depreciable lives-new (in years), maximum	36
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	6,243	6,253	6,786
Equipment Leased to Other Party [Member] | Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	49,954	46,240
Property, plant and equipment - net	36,231	34,271
Depreciable lives-new (in years), minimum	19
Depreciable lives-new (in years), maximum	21
Impairment of Long-Lived Assets Held-for-use	242	301
Equipment Leased to Other Party [Member] | Vehicles [Member]
Property, Plant and Equipment [Line Items]
Original cost	17,574	15,278
Property, plant and equipment - net	9,263	8,772
Depreciable lives-new (in years), minimum	1
Depreciable lives-new (in years), maximum	28
Equipment Leased to Other Party [Member] | Railroad Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	4,210	4,324
Property, plant and equipment - net	2,746	2,853
Depreciable lives-new (in years), minimum	4
Depreciable lives-new (in years), maximum	50
Equipment Leased to Other Party [Member] | Construction and manufacturing [Member]
Property, Plant and Equipment [Line Items]
Original cost	3,055	2,644
Property, plant and equipment - net	2,069	1,670
Depreciable lives-new (in years), minimum	1
Depreciable lives-new (in years), maximum	30
Equipment Leased to Other Party [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	3,427	3,438
Property, plant and equipment - net	2,290	2,354
Depreciable lives-new (in years), minimum	3
Depreciable lives-new (in years), maximum	27
Equipment Leased to Other Party [Member] | Leased To Parent [Member]
Property, Plant and Equipment [Line Items]
Original cost	1,467	1,570
Less accumulated depreciation and amortization	$ 452	$ 445