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RETIREMENT PLANS - Schedule of Change in Fair Value of Level 3 Assets (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | $ 26,399 |
Actual return on plan assets: |  |
Balance at end of year | 27,245 | $ 26,399
U.S. Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 25,797 | 24,826
Actual return on plan assets: |  |
Balance at end of year | 26,601 | 25,797
Unobservable Inputs Level 3 | U.S. Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance at beginning of year | 1,075 | 937
Actual return on plan assets: |  |
Assets held during current year | (63) | 59
Assets sold during the year | 75 | 30
Purchases, sales, and settlements, net | (4) | 49
Balance at end of year | $ 1,083 | $ 1,075

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