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Commitments - Schedule of Purchase Commitments (Details)
$ in Millions
May 31, 2021
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 $ 2,923
2023 3,278
2024 1,529
2025 883
2026 779
Thereafter 2,577
Total 11,969
Aircraft And Related Equipment Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 1,898
2023 2,567
2024 1,017
2025 479
2026 432
Thereafter 2,325
Total 8,718
Other Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2022 1,025 [1]
2023 711 [1]
2024 512 [1]
2025 404 [1]
2026 347 [1]
Thereafter 252 [1]
Total $ 3,251 [1]
[1] Primarily equipment and advertising contracts.