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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
May 31, 2018
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2019 $ 2,428
2020 2,614
2021 1,671
2022 1,644
2023 813
Thereafter 3,144
Total 12,314
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2019 1,534
2020 1,922
2021 1,255
2022 1,359
2023 628
Thereafter 2,653
Total 9,351
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2019 894 [1]
2020 692 [1]
2021 416 [1]
2022 285 [1]
2023 185 [1]
Thereafter 491 [1]
Total $ 2,963 [1]
[1] Primarily equipment and advertising contracts.