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Retirement Plans - Schedule of Net Periodic Benefit (Income) Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2024 | May 31, 2023 | May 31, 2022
Pension Plans [Member] | U.S. Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | $ 544 | $ 651 | $ 835
Interest cost | 1,362 | 1,218 | 1,020
Expected return on plan assets | (1,598) | (1,688) | (1,910)
Amortization of prior service credit | (7) | (7) | (7)
Actuarial (gains) losses and other | (590) | (487) | 1,683
Net periodic benefit (income) cost | (289) | (313) | 1,621
Pension Plans [Member] | International Pension Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 38 | 44 | 56
Interest cost | 42 | 34 | 32
Expected return on plan assets | (18) | (14) | (26)
Amortization of prior service credit |  | (2) | (2)
Actuarial (gains) losses and other | 13 | (25) | 87
Net periodic benefit (income) cost | 75 | 37 | 147
Postretirement Healthcare Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 27 | 37 | 48
Interest cost | 61 | 55 | 41
Amortization of prior service credit | (3) |  |
Actuarial (gains) losses and other | 16 | (138) | (192)
Net periodic benefit (income) cost | $ 101 | $ (46) | $ (103)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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)(5) -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)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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