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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2024 | Feb. 28, 2023 | Feb. 29, 2024 | Feb. 28, 2023
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 136 | $ 162 | $ 408 | $ 488
Other retirement plans expense (income): |  |  |  |
Interest cost | 341 | 304 | 1,022 | 913
Expected return on plan assets | (400) | (422) | (1,199) | (1,266)
Amortization of prior service credit and other | (2) | (1) | (5) | (5)
Other retirement plans (income) expense | (61) | (119) | (182) | (358)
Net periodic benefit cost | 75 | 43 | 226 | 130
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 9 | 13 | 29 | 34
Other retirement plans expense (income): |  |  |  |
Interest cost | 10 | 8 | 32 | 25
Expected return on plan assets | (2) | (3) | (13) | (11)
Amortization of prior service credit and other |  | (2) |  | (2)
Other retirement plans (income) expense | 8 | 3 | 19 | 12
Net periodic benefit cost | 17 | 16 | 48 | 46
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 7 | 10 | 21 | 28
Other retirement plans expense (income): |  |  |  |
Interest cost | 15 | 14 | 45 | 42
Expected return on plan assets |  |  |  |
Amortization of prior service credit and other | (2) |  | (2) |
Other retirement plans (income) expense | 13 | 14 | 43 | 42
Net periodic benefit cost | $ 20 | $ 24 | $ 64 | $ 70

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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 -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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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