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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
May 31, 2019
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 $ 2,416
2021 3,042
2022 2,245
2023 1,832
2024 632
Thereafter 2,856
Total 13,023
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 1,518
2021 2,455
2022 1,862
2023 1,569
2024 492
Thereafter 2,456
Total 10,352
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 898 [1]
2021 587 [1]
2022 383 [1]
2023 263 [1]
2024 140 [1]
Thereafter 400 [1]
Total $ 2,671 [1]
[1] Primarily equipment and advertising contracts.