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Description of Business and Summary of Significant Accounting Policies (Details 3) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2016 USD ($) | May 31, 2015 USD ($) | May 31, 2014 USD ($) | May 31, 2013 | May 31, 2012
Depreciation [Abstract] |  |  |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment | $ 2,600 | $ 2,600 | $ 2,600 |  |
Depreciable Life Range For Majority Of Aircraft Costs | 15 to 30 |  |  |  |
Number of Aircraft With Shortened Depreciable Lives |  | 23 |  | 76 | 54
Number of Aircraft Engines With Shortened Depreciable Lives |  | 57 |  |  |
Incremental Depreciation Expense |  |  | $ 74 |  |
TNT PPE Fair Value | $ 1,100 |  |  |  |

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- Definition Describes the periods of time over which an entity anticipates to receive utility from the majority of aircraft costs. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Fair value portion 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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