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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020
Other retirement plans (income) expense: |  |  |  |
MTM net loss |  |  | $ 52 |
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 213 | $ 192 | 638 | $ 576
Other retirement plans (income) expense: |  |  |  |
Interest cost | 240 | 250 | 719 | 750
Expected return on plan assets | (447) | (400) | (1,339) | (1,201)
Amortization of prior service credit and other | (2) | (26) | (6) | (78)
Other retirement plans (income) expense | (209) | (176) | (626) | (529)
Net periodic benefit cost | 4 | 16 | 12 | 47
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 19 | 25 | 68 | 73
Other retirement plans (income) expense: |  |  |  |
Interest cost | 10 | 11 | 31 | 33
Expected return on plan assets | (13) | (13) | (38) | (39)
Amortization of prior service credit and other |  | (1) | (1) | (2)
MTM net loss |  |  | 52 |
Other retirement plans (income) expense | (3) | (3) | 44 | (8)
Net periodic benefit cost | 16 | 22 | 112 | 65
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 11 | 10 | 33 | 31
Other retirement plans (income) expense: |  |  |  |
Interest cost | 10 | 11 | 29 | 33
Other retirement plans (income) expense | 10 | 11 | 29 | 33
Net periodic benefit cost | $ 21 | $ 21 | $ 62 | $ 64

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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 http://asc.fasb.org/extlink&oid=118257860&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=118257860&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=118255775&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=109237824&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=118255775&loc=d3e2709-114920 + Details
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