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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
May 31, 2017
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2018 $ 3,217
2019 2,237
2020 2,333
2021 1,650
2022 1,474
Thereafter 3,394
Total 14,305
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2018 1,777
2019 1,729
2020 1,933
2021 1,341
2022 1,276
Thereafter 2,895
Total 10,951
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2018 1,440 [1]
2019 508 [1]
2020 400 [1]
2021 309 [1]
2022 198 [1]
Thereafter 499 [1]
Total $ 3,354 [1]
[1] Primarily equipment, advertising contracts and, in 2018, approximately $700 million of estimated required quarterly contributions to our U.S. Pension Plans.