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Retirement Plans - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |
Actual versus expected return on assets | $ 2,492 | $ 5,109 | $ (1,712)
Discount rate change | (3,395) | (4,486) | (397)
Demographic experience: |  |  |
Current year actuarial loss | 142 | 504 | 302
Change in future assumptions | 110 | 314 | 685
Termination of TNT Express Netherlands pension plan |  | 224 |
Pension plan amendments, including curtailment gains | 1 | (87) | (54)
Total MTM (gain) loss | $ (650) | $ 1,578 | $ (1,176)

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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 Demographic experience. + References No definition available. + Details
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- Definition The amount of actuarial gain/loss attributable to the discount rate. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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