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Retirement Plans - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2021 | Feb. 28, 2023 | Feb. 28, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan contributions by employer |  | $ 800,000,000 |
Non-cash MTM net loss |  |  | $ 260,000,000
Pension Plans [Member] | U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan expected future employer contributions |  | $ 0 |
Non-cash MTM net loss |  |  | 36,000,000
Pension Plans [Member] | North America [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-cash MTM net loss | $ 36,000,000 |  |
Percentage of FedEx Freight employees elected to move to new 401(k) plan | 21.00% |  |
MTM loss due to lower discount rate | $ 75,000,000 |  |
Curtailment gain | 39,000,000 |  |
Pension Plans [Member] | International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-cash MTM net loss |  |  | $ 224,000,000
Pension Plans [Member] | Netherlands [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-cash MTM net loss | $ 224,000,000 |  |

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