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Retirement Plans - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2024 | May 31, 2023 | May 31, 2022
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |
Actual versus expected return on assets | $ (67) | $ 2,492 | $ 5,109
Discount rate change | (1,139) | (3,395) | (4,486)
Demographic experience: |  |  |
Current year actuarial loss | 67 | 142 | 504
Change in future assumptions | 577 | 110 | 314
Termination of TNT Express Netherlands pension plan |  |  | 224
Pension plan amendments, including curtailment gains | 1 | 1 | (87)
Total MTM (gain) loss | $ (561) | $ (650) | $ 1,578

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- Definition Actuarial gain loss by component pre-tax. + References No definition available. + Details
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- Definition Change in future assumptions. + References No definition available. + Details
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- Definition Pension Plan Amendments, Including Curtailment Gains + References No definition available. + Details
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- Definition The annual retirement plan amount recorded for actuarial gains and losses calculated using actual fair value of plan assets. + References No definition available. + Details
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- Definition Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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