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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2022 | Aug. 31, 2021
Pension Plans [Member] | U.S. Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | $ 163 | $ 208
Other retirement plans expense (income): |  |
Interest cost | 304 | 256
Expected return on plan assets | (422) | (478)
Amortization of prior service credit and other | (2) | (2)
Other retirement plans (income) expense | (120) | (224)
Net periodic benefit cost | 43 | (16)
Pension Plans [Member] | International Pension Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | 11 | 15
Other retirement plans expense (income): |  |
Interest cost | 9 | 12
Expected return on plan assets | (4) | (14)
Other retirement plans (income) expense | 5 | (2)
Net periodic benefit cost | 16 | 13
Postretirement Healthcare Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | 9 | 12
Other retirement plans expense (income): |  |
Interest cost | 14 | 10
Other retirement plans (income) expense | 14 | 10
Net periodic benefit cost | $ 23 | $ 22

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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