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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
Feb. 29, 2020
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) $ 490
2021 3,082
2022 3,200
2023 2,450
2024 925
Thereafter 3,943
Total 14,090
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) 159
2021 2,285
2022 2,630
2023 2,069
2024 698
Thereafter 3,358
Total 11,199
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2020 (remainder) 331 [1]
2021 797 [1]
2022 570 [1]
2023 381 [1]
2024 227 [1]
Thereafter 585 [1]
Total $ 2,891 [1]
[1] Primarily equipment and advertising contracts.