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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, 2022 | May 31, 2021
Property Plant And Equipment [Line Items] |  |
Net Book Value at May 31, | $ 38,091 | $ 35,752
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, | $ 15,949 | 14,812
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, | $ 2,163 | 2,307
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, | $ 6,447 | 5,269
Information Technology [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 2 to 10 years |
Net Book Value at May 31, | $ 1,907 | 1,863
Vehicles And Trailers [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 3 to 15 years |
Net Book Value at May 31, | $ 4,004 | 4,033
Facilities and Other [Member] |  |
Property Plant And Equipment [Line Items] |  |
Depreciable lives range | 2 to 40 years |
Net Book Value at May 31, | $ 7,621 | $ 7,468

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