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Retirement Plans - Schedule of Fair Value of Plan Assets for Pension Plans with a PBO or ABO in Excess of Plan Assets (Details) - Pension Plans [Member] - USD ($) $ in Millions | May 31, 2024 | May 31, 2023
--- | --- | ---
U.S. Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | $ 25,797 | $ 24,826
PBO |  | (26,284) | (26,426)
Net funded status |  | (487) | (1,600)
ABO | [1] | (124) | (25,825)
Fair value of plan assets |  |  | 24,826
PBO |  | (132) | (26,426)
Net funded status |  | (132) | (1,600)
International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 239 | 223
PBO |  | (728) | (722)
Net funded status |  | (489) | (499)
ABO | [1] | (575) | (562)
Fair value of plan assets |  | 216 | 201
PBO |  | (703) | (700)
Net funded status |  | $ (487) | $ (499)
[1] | ABO not used in determination of funded status.

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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