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Retirement Plans - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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May 31, 2018 USD ($) RetireeandBeneficiary | May 31, 2017 USD ($) Employee | Feb. 28, 2018 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($) | May 31, 2018 USD ($) | May 31, 2017 USD ($) | May 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
U.S. pension plan actual rate of return on assets |  |  |  |  | 4.05% | 6.30% | 9.20% |
Weighted average discount rate percent all pension postretirement plans |  |  |  |  | 3.69% | 4.11% | 3.98% | 4.04%
Actual rate of return on plan assets for the 15-year period |  |  |  |  | 7.50% |  |  |
Amounts recognized in other comprehensive income primarily related to amortization of prior service cost, net of tax |  |  |  |  | $ 92,000,000 | $ 89,000,000 | $ 75,000,000 |
Defined benefit plan health care cost trend rate assumed for next fiscal year |  |  |  |  | 6.00% |  |  |
Defined benefit plan ultimate health care cost trend rate |  |  |  |  | 4.50% |  |  |
Defined benefit plan year that rate reaches ultimate trend rate |  |  |  |  | 2037 |  |  |
Metropolitan Life Insurance Company [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
One-time settlement loss | $ 210,000,000 |  |  |  |  |  |  |
U.S. Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  | $ 1,500,000,000 |  | $ 1,000,000,000 | $ 2,500,000,000 |  |
Pension Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected long-term rate of return on assets |  |  |  |  | 6.75% | 6.50% | 6.50% |
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected long-term rate of return on assets |  |  |  |  | 6.75% | 6.50% | 6.50% |
Number of former employees elected to receive lump sum distribution | Employee |  | 18,300 |  |  |  |  |  |
Lump sum amount paid to former employees |  | $ 1,300,000,000 |  |  |  |  |  |
Group annuity contract and transfer |  |  |  |  |  | $ 6,178,000,000 |  |
Defined benefit plan contributions by employer |  |  |  |  | $ 1,034,000,000 | 2,547,000,000 |  |
Amounts recognized in other comprehensive income primarily related to amortization of prior service cost |  |  |  |  | 118,000,000 | 118,000,000 |  |
Amounts recognized in other comprehensive income primarily related to amortization of prior service cost, net of tax |  |  |  |  | 91,000,000 | 83,000,000 |  |
Pension Plans [Member] | U.S. Plans [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  |  | $ 0 |  |  |  |
Pension Plans [Member] | U.S. Plans [Member] | Metropolitan Life Insurance Company [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan responsibility transferred to number of retirees and beneficiaries | RetireeandBeneficiary | 41,000 |  |  |  |  |  |  |
Group annuity contract and transfer | $ 6,000,000,000 |  |  |  |  |  |  |
Voluntary Contribution [Member] | U.S. Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  |  |  | $ 1,000,000,000 | $ 2,478,000,000 |  |
Voluntary Contribution [Member] | U.S. Plans [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan contributions by employer |  |  |  | $ 1,000,000,000 |  |  |  |

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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 Defined benefit plan responsibility transferred to number of retirees and beneficiaries. + References No definition available. + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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