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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, 2022 | May 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | $ 31,918 |
Actual return on plan assets: |  |
Balance at end of year | 26,633 | $ 31,918
U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 29,785 | 26,978
Actual return on plan assets: |  |
Balance at end of year | 25,970 | 29,785
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 537 | 416
Actual return on plan assets: |  |
Assets held during current year | 192 | 41
Assets sold during the year | 29 | 22
Purchases, sales and settlements | 53 | 58
Balance at end of year | $ 811 | $ 537

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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=123447040&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=123450688&loc=d3e4179-114921 + Details
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