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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Pension Plans [Member] | U.S. Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | $ 169 | $ 160 | $ 509 | $ 479
Interest cost | 279 | 282 | 836 | 846
Expected return on plan assets | (406) | (375) | (1,218) | (1,126)
Amortization of prior service credit and other | (29) | (30) | (88) | (89)
Total net periodic benefit cost | 13 | 37 | 39 | 110
Pension Plans [Member] | International Pension Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 23 | 20 | 69 | 61
Interest cost | 12 | 11 | 37 | 33
Expected return on plan assets | (10) | (9) | (32) | (30)
Amortization of prior service credit and other | 1 | (2) |  | (1)
Total net periodic benefit cost | 26 | 20 | 74 | 63
Postretirement Healthcare Plans [Member] |  |  |  |
Net Periodic Benefit Cost |  |  |  |
Service cost | 9 | 9 | 27 | 27
Interest cost | 10 | 10 | 29 | 30
Total net periodic benefit cost | $ 19 | $ 19 | $ 56 | $ 57

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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 increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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 (a)(7) -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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