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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2018
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 192 | $ 172 | $ 384 | $ 344
Other retirement plans (income) expense: |  |  |  |
Interest cost | 250 | 238 | 500 | 476
Expected return on plan assets | (401) | (376) | (801) | (753)
Amortization of prior service credit and other | (25) | (30) | (52) | (59)
Other retirement plans (income) expense | (176) | (168) | (353) | (336)
Net periodic benefit cost | 16 | 4 | 31 | 8
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 24 | 25 | 48 | 49
Other retirement plans (income) expense: |  |  |  |
Interest cost | 11 | 12 | 22 | 25
Expected return on plan assets | (13) | (12) | (26) | (24)
Amortization of prior service credit and other | (1) |  | (1) | (1)
Other retirement plans (income) expense | (3) |  | (5) |
Net periodic benefit cost | 21 | 25 | 43 | 49
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 10 | 8 | 21 | 17
Other retirement plans (income) expense: |  |  |  |
Interest cost | 11 | 10 | 22 | 20
Other retirement plans (income) expense | 11 | 10 | 22 | 20
Net periodic benefit cost | $ 21 | $ 18 | $ 43 | $ 37

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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/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 3: 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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