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Leases - Summary of Future Minimum Lease Payments, Operating and Finance Leases (Details) - USD ($) $ in Millions | May 31, 2021 | May 31, 2020
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Schedule Of Future Minimum Lease Payments For Operating Leases And Finance Leases [Line Items] |  |
2022 | $ 2,656 |
2023 | 2,559 |
2024 | 2,112 |
2025 | 1,832 |
2026 | 1,600 |
Thereafter | 8,240 |
Total lease payments | 18,999 |
Less imputed interest | (2,891) |
Present value of lease liability | 16,108 |
Operating Leases |  |
2022 | 2,637 |
2023 | 2,453 |
2024 | 2,088 |
2025 | 1,808 |
2026 | 1,577 |
Thereafter | 7,542 |
Total lease payments | 18,105 |
Less imputed interest | (2,522) |
Present value of lease liability | 15,583 | $ 14,118
Finance Leases |  |
2022 | 19 |
2023 | 106 |
2024 | 24 |
2025 | 24 |
2026 | 23 |
Thereafter | 698 |
Total lease payments | 894 |
Less imputed interest | (369) |
Present value of lease liability | 525 | $ 485
Aircraft and Related Equipment [Member] |  |
Operating Leases |  |
2022 | 234 |
2023 | 198 |
2024 | 102 |
2025 | 69 |
2026 | 61 |
Thereafter | 184 |
Total lease payments | 848 |
Less imputed interest | (66) |
Present value of lease liability | 782 |
Facilities and Other [Member] |  |
Operating Leases |  |
2022 | 2,403 |
2023 | 2,255 |
2024 | 1,986 |
2025 | 1,739 |
2026 | 1,516 |
Thereafter | 7,358 |
Total lease payments | 17,257 |
Less imputed interest | (2,456) |
Present value of lease liability | $ 14,801 |

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