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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 |
--- | --- | ---
May 31, 2024 | May 31, 2023
Property Plant And Equipment [Line Items] |  |
Net Book Value at May 31, | $ 41,491 | $ 40,698
Wide-body Aircraft and Related Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 18 to 30 years |
Net Book Value at May 31, | $ 17,936 | 16,973
Wide-body Aircraft and Related Equipment [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 30 years |
Wide-body Aircraft and Related Equipment [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 18 years |
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, | $ 1,849 | 2,038
Narrow-body and Feeder Aircraft and Related Equipment [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 30 years |
Narrow-body and Feeder Aircraft and Related Equipment [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 5 years |
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, | $ 7,607 | 7,562
Package Handling and Ground Support Equipment [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 15 years |
Package Handling and Ground Support Equipment [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 3 years |
Information Technology [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 7 years |
Net Book Value at May 31, | $ 1,722 | 1,859
Information Technology [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 7 years |
Information Technology [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 3 years |
Vehicles And Trailers [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 15 years |
Net Book Value at May 31, | $ 4,053 | 3,996
Vehicles And Trailers [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 15 years |
Vehicles And Trailers [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 3 years |
Facilities and Other [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 1 to 33 years |
Net Book Value at May 31, | $ 8,324 | $ 8,270
Facilities and Other [Member] | Maximum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 33 years |
Facilities and Other [Member] | Minimum [Member] |  |
Property Plant And Equipment [Line Items] |  |
Property and equipment useful life | 1 year |

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