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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2021
Other retirement plans expense (income): |  |  |  |
MTM net loss |  | $ 260 |  | $ 260
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 163 | 208 | $ 326 | 416
Other retirement plans expense (income): |  |  |  |
Interest cost | 305 | 255 | 609 | 511
Expected return on plan assets | (422) | (477) | (844) | (955)
Amortization of prior service credit and other | (2) | (2) | (4) | (4)
MTM net loss |  | 36 |  | 36
Other retirement plans (income) expense | (119) | (188) | (239) | (412)
Net periodic benefit cost | 44 | 20 | 87 | 4
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 10 | 14 | 21 | 29
Other retirement plans expense (income): |  |  |  |
Interest cost | 8 | 7 | 17 | 19
Expected return on plan assets | (4) | (6) | (8) | (20)
Amortization of prior service credit and other |  | (1) |  | (1)
MTM net loss |  | 224 |  | 224
Other retirement plans (income) expense | 4 | 224 | 9 | 222
Net periodic benefit cost | 14 | 238 | 30 | 251
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 9 | 12 | 18 | 24
Other retirement plans expense (income): |  |  |  |
Interest cost | 14 | 11 | 28 | 21
Other retirement plans (income) expense | 14 | 11 | 28 | 21
Net periodic benefit cost | $ 23 | $ 23 | $ 46 | $ 45

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- Definition Defined benefit plan, other retirement plan income (expense). + References No definition available. + Details
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- Definition The annual retirement plan amount recorded for actuarial gains and losses calculated using actual fair value of plan assets. + References No definition available. + Details
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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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