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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020
Other retirement plans expense (income): |  |  |  |
MTM net loss | $ 260 | $ 52 | $ 260 | $ 52
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 208 | 212 | 416 | 425
Other retirement plans expense (income): |  |  |  |
Interest cost | 255 | 239 | 511 | 479
Expected return on plan assets | (477) | (446) | (955) | (892)
Amortization of prior service credit and other | (2) | (2) | (4) | (4)
MTM net loss | 36 |  | 36 |
Other retirement plans (income) expense | (188) | (209) | (412) | (417)
Net periodic benefit cost | 20 | 3 | 4 | 8
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 14 | 26 | 29 | 49
Other retirement plans expense (income): |  |  |  |
Interest cost | 7 | 11 | 19 | 21
Expected return on plan assets | (6) | (13) | (20) | (25)
Amortization of prior service credit and other | (1) |  | (1) | (1)
MTM net loss | 224 | 52 | 224 | 52
Other retirement plans (income) expense | 224 | 50 | 222 | 47
Net periodic benefit cost | 238 | 76 | 251 | 96
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 12 | 11 | 24 | 22
Other retirement plans expense (income): |  |  |  |
Interest cost | 11 | 9 | 21 | 19
Other retirement plans (income) expense | 11 | 9 | 21 | 19
Net periodic benefit cost | $ 23 | $ 20 | $ 45 | $ 41

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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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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