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Retirement Plans - Additional Information (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 USD ($) Employee | May 31, 2018 USD ($) | May 31, 2017 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($) | May 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
U.S. pension plan actual rate of return on assets |  |  | 9.60% | 1.20% |  |
Weighted average discount rate percent all pension postretirement plans |  |  | 3.98% | 4.04% | 4.38% | 4.57%
Increase in overall projected benefit obligation due to new mortality table. |  |  |  |  | $ 1,200 |
Actual rate of return on plan assets for the 15-year period |  |  | 7.80% |  |  |
Defined benefit plan health care cost trend rate assumed for next fiscal year |  |  | 7.80% |  |  |
Defined benefit plan ultimate health care cost trend rate |  |  | 4.50% |  |  |
Defined benefit plan year that rate reaches ultimate trend rate | 2037 |  | 2037 |  |  |
U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term rate of return on assets |  |  | 6.50% | 6.50% | 7.75% |
Number of former employees elected to receive lump sum distribution | Employee | 18,300 |  |  |  |  |
Lump sum amount paid to former employees | $ 1,300 |  |  |  |  |
Defined benefit plan contributions by employer |  |  | $ 2,020 | $ 693 |  |
U.S. Pension Plans [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan contributions by employer |  | $ 1,000 |  |  |  |
Defined benefit pension plan, required employer contribution |  | $ 700 |  |  |  |
Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term rate of return on assets |  |  | 6.50% | 6.50% | 7.75% |

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- Definition The actual rate of return on plan assets for the 15-year period reflecting the average rate of earnings on the funds invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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