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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
Feb. 28, 2021
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 (remainder) $ 461
2022 2,965
2023 2,917
2024 1,335
2025 728
Thereafter 3,257
Total 11,663
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 (remainder) 162
2022 2,211
2023 2,397
2024 1,002
2025 479
Thereafter 2,803
Total 9,054
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2021 (remainder) 299 [1]
2022 754 [1]
2023 520 [1]
2024 333 [1]
2025 249 [1]
Thereafter 454 [1]
Total $ 2,609 [1]
[1] Primarily equipment and advertising contracts.