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Retirement Plans - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 Employee | Nov. 30, 2021 USD ($) | Nov. 30, 2020 USD ($) | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($) | May 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Non-cash MTM net loss |  |  |  | $ 260,000,000 | $ 52,000,000 |
401(k) plan description |  |  |  | In 2020, we announced the closing of our U.S.-based defined benefit pension plans to new non-union employees hired on or after January 1, 2020. We introduced an all-401(k) plan retirement benefit structure for eligible employees with a higher company match of up to 8% across all U.S.-based operating companies in 2022. During calendar 2021, current eligible employees under the Portable Pension Account (“PPA”) pension formula were given a one-time option to continue to be eligible for pension compensation credits under the existing PPA formula and remain in the existing 401(k) plan with its match of up to 3.5%, or to cease receiving compensation credits under the PPA and move to the new 401(k) plan with the higher company match of up to 8%. Changes to the new 401(k) plan structure became effective January 1, 2022. While this new program will provide employees greater flexibility and reduce our long-term pension costs, it will not have a material impact on current or near-term financial results. |  |
Future Plan Structure [Member] | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Company matching contributions to eligible employees |  |  |  | 8.00% |  |
Current Plan Structure [Member] | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Company matching contributions to eligible employees |  |  |  | 3.50% |  |
Voluntary Contribution [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  |  | $ 500,000,000 |  |
Pension Plans [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Non-cash MTM net loss |  |  |  | 36,000,000 |  |
Pension Plans [Member] | U.S. Pension Plans [Member] | Forecast [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  |  |  |  | $ 0
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 | $ 52,000,000 |
Pension Plans [Member] | Netherlands [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Non-cash MTM net loss |  | $ 224,000,000 | $ 52,000,000 |  |  |
MTM loss due to lower discount rate |  |  | 106,000,000 |  |  |
Curtailment gain |  |  | $ 54,000,000 |  |  |
Number of employees frozen | Employee | 2,100 |  |  |  |  |

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