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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, 2023 | May 31, 2022
--- | --- | ---
U.S. Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | $ 24,826 | $ 25,970
PBO |  | (26,426) | (28,702)
Net funded status |  | (1,600) | (2,732)
ABO | [1] | (25,825) | (27,916)
Fair value of plan assets |  | 24,826 | 25,970
PBO |  | (26,426) | (28,702)
Net funded status |  | (1,600) | (2,732)
International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 223 | 199
PBO |  | (722) | (758)
Net funded status |  | (499) | (559)
ABO | [1] | (562) | (604)
Fair value of plan assets |  | 201 | 196
PBO |  | (700) | (754)
Net funded status |  | $ (499) | $ (558)
[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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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