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Retirement Plans - Additional Information (Details) - USD ($) | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023 | May 31, 2022 | May 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average discount rate percent all pension postretirement plans |  | 5.53% | 5.17% | 4.21% | 3.11%
U.S. pension plan actual rate of return on assets |  | 6.80% | (2.70%) | (10.80%) |
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 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 company 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 match of up to 8%. Changes to the new 401(k) plan structure became effective January 1, 2022. See Note 1 for additional information on expected amendments to our pension plan offered to FedEx Express pilots. |  |  |
Actual rate of return on plan assets for the 15-year period |  | 7.60% |  |  |
Amounts recognized in other comprehensive income primarily related to amortization of prior service cost, net of tax |  | $ 8,000,000 | $ 10,000,000 | $ 8,000,000 |
Defined benefit plan health care cost trend rate assumed for next fiscal year |  | 7.30% |  |  |
Defined benefit plan ultimate health care cost trend rate |  | 4.00% |  |  |
Defined benefit plan year that rate reaches ultimate trend rate |  | 2045 |  |  |
U.S. Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan required contributions by employer |  | $ 800,000,000 | $ 800,000,000 |  |
Pension Plan [Member] | U.S. Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected long-term rate of return on assets |  | 6.50% | 6.50% | 6.50% |
Defined benefit plan required contributions by employer |  | $ 831,000,000 | $ 826,000,000 |  |
Amounts recognized in other comprehensive loss primarily related to amortization of prior service cost |  | 7,000,000 | 7,000,000 |  |
Amounts recognized in other comprehensive income primarily related to amortization of prior service cost, net of tax |  | $ 6,000,000 | 6,000,000 |  |
Pension Plan [Member] | U.S. Plans [Member] | Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan required contributions by employer | $ 0 |  |  |  |
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. Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan required contributions by employer |  | $ 800,000,000 | $ 800,000,000 |  |
Voluntary Contribution [Member] | U.S. Plans [Member] | Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan required contributions by employer | $ 800,000,000 |  |  |  |

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- Definition U.S. pension plan actual rate of return on assets. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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