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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
May 31, 2020
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 $ 3,126
2022 3,362
2023 2,443
2024 960
2025 886
Thereafter 3,120
Total 13,897
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 2,177
2022 2,772
2023 2,036
2024 697
2025 660
Thereafter 2,723
Total 11,065
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 949 [1]
2022 590 [1]
2023 407 [1]
2024 263 [1]
2025 226 [1]
Thereafter 397 [1]
Total $ 2,832 [1]
[1] Primarily equipment and advertising contracts.