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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Pension Plans [Member] | U.S. Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | $ 679 | $ 638 | $ 622
Interest cost | 1,115 | 1,128 | 1,155
Expected return on plan assets | (1,624) | (1,501) | (1,490)
Amortization of prior service credit | (118) | (118) | (118)
Actuarial losses (gains) and other | 37 | (95) | 1,563
Net periodic benefit cost | 89 | 52 | 1,732
Pension Plans [Member] | International Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 97 | 83 | 40
Interest cost | 49 | 43 | 25
Expected return on plan assets | (46) | (38) | (18)
Amortization of prior service credit | (2) | (2) | (3)
Actuarial losses (gains) and other | (38) | 87 | (1)
Net periodic benefit cost | 60 | 173 | 43
Postretirement Healthcare Plans [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 36 | 36 | 40
Interest cost | 39 | 39 | 42
Amortization of prior service credit | (1) |  |
Actuarial losses (gains) and other | (9) | (14) | (64)
Net periodic benefit cost | $ 65 | $ 61 | $ 18

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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