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Description of Business Segments and Summary of Significant Accounting Policies - Schedule of Depreciable Lives and Net Book Value of Our Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
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May 31, 2021 | May 31, 2020
Property Plant And Equipment [Line Items] |  |
Net Book Value at May 31, | $ 35,752 | $ 33,608
Wide-body Aircraft and Related Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 15 to 30 years |
Net Book Value at May 31, | $ 14,812 | 13,448
Narrow-body and Feeder Aircraft and Related Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 5 to 30 years |
Net Book Value at May 31, | $ 2,307 | 2,478
Package Handling and Ground Support Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 30 years |
Net Book Value at May 31, | $ 5,269 | 4,499
Information Technology [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 2 to 10 years |
Net Book Value at May 31, | $ 1,863 | 1,795
Vehicles And Trailers [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 15 years |
Net Book Value at May 31, | $ 4,033 | 4,345
Facilities and Other Property [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 2 to 40 years |
Net Book Value at May 31, | $ 7,468 | $ 7,043

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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