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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, 2023 | May 31, 2022
Property Plant And Equipment [Line Items] |  |
Net Book Value at May 31, | $ 40,698 | $ 38,091
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, | $ 16,973 | 15,949
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, | $ 2,038 | 2,163
Package Handling and Ground Support Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 15 years |
Net Book Value at May 31, | $ 7,562 | 6,447
Information Technology [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 7 years |
Net Book Value at May 31, | $ 1,859 | 1,907
Vehicles And Trailers [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 15 years |
Net Book Value at May 31, | $ 3,996 | 4,004
Facilities and Other [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 1 to 33 years |
Net Book Value at May 31, | $ 8,270 | $ 7,621

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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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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 https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 360 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429447&loc=SL124453093-239630 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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