Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Impairment

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property Plant and Equipment, Orignial Cost and Net Carrying Value (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Original cost	$ 77,232us-gaap_PropertyPlantAndEquipmentGross	$ 78,567us-gaap_PropertyPlantAndEquipmentGross
Property, Plant and Equipment, Net (Note 5)	49,570us-gaap_PropertyPlantAndEquipmentNet	51,607us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization	6,245us-gaap_Depreciation	6,696us-gaap_Depreciation	6,097us-gaap_Depreciation
Impairment of Long-Lived Assets Held-for-use	445	732
Land And Improvements, Buildings, Structures And Related Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	2,233	2,504
Property, Plant and Equipment, Net (Note 5)	952	1,025
Land And Improvements, Buildings, Structures And Related Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
Land And Improvements, Buildings, Structures And Related Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	35 years
EquipmentLeasedToOtherPartyMember
Property, Plant and Equipment [Line Items]
Original cost	1,845	1,353
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	560	342
EquipmentLeasedToOtherPartyMember \| Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	49,280	50,337
Property, Plant and Equipment, Net (Note 5)	32,795	34,938
Depreciable lives-new (in years)	20 years
EquipmentLeasedToOtherPartyMember \| Vehicles [Member]
Property, Plant and Equipment [Line Items]
Original cost	14,251	14,656
Property, Plant and Equipment, Net (Note 5)	8,144	8,312
EquipmentLeasedToOtherPartyMember \| Vehicles [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
EquipmentLeasedToOtherPartyMember \| Vehicles [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	20 years
EquipmentLeasedToOtherPartyMember \| Railroad Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	4,379	4,636
Property, Plant and Equipment, Net (Note 5)	2,998	3,129
EquipmentLeasedToOtherPartyMember \| Railroad Transportation Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	4 years
EquipmentLeasedToOtherPartyMember \| Railroad Transportation Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	50 years
EquipmentLeasedToOtherPartyMember \| Construction And Manufacturing [Member]
Property, Plant and Equipment [Line Items]
Original cost	3,411	2,916
Property, Plant and Equipment, Net (Note 5)	2,321	1,955
EquipmentLeasedToOtherPartyMember \| Construction And Manufacturing [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	1 year
EquipmentLeasedToOtherPartyMember \| Construction And Manufacturing [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	20 years
EquipmentLeasedToOtherPartyMember \| Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Original cost	3,678	3,518
Property, Plant and Equipment, Net (Note 5)	$ 2,360	$ 2,248
EquipmentLeasedToOtherPartyMember \| Other Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	6 years
EquipmentLeasedToOtherPartyMember \| Other Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives-new (in years)	25 years