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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
Aug. 31, 2019
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) $ 1,832
2021 3,127
2022 2,862
2023 1,927
2024 695
Thereafter 2,990
Total 13,433
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) 1,043
2021 2,436
2022 2,392
2023 1,587
2024 503
Thereafter 2,449
Total 10,410
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) 789 [1]
2021 691 [1]
2022 470 [1]
2023 340 [1]
2024 192 [1]
Thereafter 541 [1]
Total $ 3,023 [1]
[1] Primarily equipment and advertising contracts.