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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2023 | Feb. 28, 2022
Other retirement plans expense (income): |  |  |  |
MTM net loss |  |  |  | $ 260
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 162 | $ 209 | $ 488 | 625
Other retirement plans expense (income): |  |  |  |
Interest cost | 304 | 254 | 913 | 765
Expected return on plan assets | (422) | (478) | (1,266) | (1,433)
Amortization of prior service credit and other | (1) | (1) | (5) | (5)
MTM net loss |  |  |  | 36
Other retirement plans (income) expense | (119) | (225) | (358) | (637)
Net periodic benefit cost | 43 | (16) | 130 | (12)
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 13 | 14 | 34 | 43
Other retirement plans expense (income): |  |  |  |
Interest cost | 8 | 8 | 25 | 27
Expected return on plan assets | (3) | (3) | (11) | (23)
Amortization of prior service credit and other | (2) | (1) | (2) | (2)
MTM net loss |  |  |  | 224
Other retirement plans (income) expense | 3 | 4 | 12 | 226
Net periodic benefit cost | 16 | 18 | 46 | 269
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 10 | 12 | 28 | 36
Other retirement plans expense (income): |  |  |  |
Interest cost | 14 | 10 | 42 | 31
Other retirement plans (income) expense | 14 | 10 | 42 | 31
Net periodic benefit cost | $ 24 | $ 22 | $ 70 | $ 67

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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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