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Retirement Plans - Schedule of Change in Fair Value of Level 3 Assets (Details) - Pension Plans [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | $ 28,691 |
Actual return on plan assets: |  |
Balance at end of year | 31,918 | $ 28,691
U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 26,978 | 23,320
Actual return on plan assets: |  |
Balance at end of year | 29,785 | 26,978
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 416 | 302
Actual return on plan assets: |  |
Assets held during current year | 41 | 19
Assets sold during the year | 22 | 16
Purchases, sales and settlements | 58 | 79
Balance at end of year | $ 537 | $ 416

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 + Details
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