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RETIREMENT PLANS - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plan (Details) - Pension Plan - USD ($) $ in Millions | May 31, 2025 | May 31, 2024 | May 31, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 27,245 | $ 26,399 |
U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 26,601 | $ 25,797 | $ 24,826
Actual % | 100.00% | 100.00% |
U.S. Pension Plans | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 4,352 | $ 4,097 |
U.S. Pension Plans | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 9,768 | 9,513 |
U.S. Pension Plans | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,083 | 1,075 | 937
U.S. Pension Plans | U.S. Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 3,804 | $ 3,376 |
Actual % | 14.00% | 13.00% |
U.S. Pension Plans | U.S. Large Cap Equity | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,678 | $ 1,382 |
U.S. Pension Plans | U.S. Large Cap Equity | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | U.S. Large Cap Equity | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 2,869 | $ 2,631 |
Actual % | 11.00% | 10.00% |
U.S. Pension Plans | International equities | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,994 | $ 1,780 |
U.S. Pension Plans | International equities | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | International equities | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Global equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,224 | $ 1,397 |
Actual % | 5.00% | 5.00% |
U.S. Pension Plans | Global equities | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Global equities | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Global equities | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | U.S. SMID cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 671 | $ 926 |
Actual % | 2.00% | 4.00% |
U.S. Pension Plans | U.S. SMID cap equity | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 662 | $ 916 |
U.S. Pension Plans | U.S. SMID cap equity | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 9 | 10 |
U.S. Pension Plans | U.S. SMID cap equity | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 6,625 | $ 6,502 |
Actual % | 25.00% | 25.00% |
U.S. Pension Plans | Corporate | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Corporate | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 6,625 | 6,502 |
U.S. Pension Plans | Corporate | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 4,142 | $ 4,194 |
Actual % | 16.00% | 16.00% |
U.S. Pension Plans | Government | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Government | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,277 | 2,335 |
U.S. Pension Plans | Government | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Mortgage-backed and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,648 | $ 1,514 |
Actual % | 6.00% | 6.00% |
U.S. Pension Plans | Mortgage-backed and other | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Mortgage-backed and other | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 229 | 205 |
U.S. Pension Plans | Mortgage-backed and other | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 4,972 | $ 4,777 |
Actual % | 19.00% | 19.00% |
U.S. Pension Plans | Alternative investments | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 15.00% | 15.00% |
U.S. Pension Plans | Alternative investments | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 25.00% | 25.00% |
U.S. Pension Plans | Alternative investments | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Alternative investments | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Pension Plans | Alternative investments | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,083 | 1,075 |
U.S. Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 5 | $ (97) |
Actual % | 0.00% | 0.00% |
U.S. Pension Plans | Other | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ (16) | $ (111) |
U.S. Pension Plans | Other | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 21 | 14 |
U.S. Pension Plans | Other | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |
U.S. Pension Plans | Total Equities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 25.00% | 25.00% |
U.S. Pension Plans | Total Equities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 40.00% | 40.00% |
U.S. Pension Plans | Total Fixed Income Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 40.00% | 40.00% |
U.S. Pension Plans | Total Fixed Income Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 60.00% | 60.00% |
U.S. Pension Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 641 | $ 577 |
Actual % | 2.00% | 2.00% |
U.S. Pension Plans | Cash and cash equivalents | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 0.00% | 0.00% |
U.S. Pension Plans | Cash and cash equivalents | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Range % | 5.00% | 5.00% |
U.S. Pension Plans | Cash and cash equivalents | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 34 | $ 130 |
U.S. Pension Plans | Cash and cash equivalents | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 607 | 447 |
U.S. Pension Plans | Cash and cash equivalents | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
International Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 644 | 602 | $ 579
Portion of fair value of plan assets | $ 349 | $ 341 |
Actual % | 100.00% | 100.00% |
International Pension Plans | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 153 | $ 157 |
International Pension Plans | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 118 | $ 62 |
Actual % | 34.00% | 18.00% |
International Pension Plans | Corporate | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 0 | $ 0 |
International Pension Plans | Corporate | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Corporate | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 184 | $ 177 |
Actual % | 53.00% | 52.00% |
International Pension Plans | Government | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 141 | $ 149 |
International Pension Plans | Government | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Government | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 35 | $ 94 |
Actual % | 10.00% | 28.00% |
International Pension Plans | Other | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 0 | $ 0 |
International Pension Plans | Other | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Other | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 12 | $ 8 |
Actual % | 3.00% | 2.00% |
International Pension Plans | Cash and cash equivalents | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 12 | $ 8 |
International Pension Plans | Cash and cash equivalents | Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | 0 | 0 |
International Pension Plans | Cash and cash equivalents | Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of fair value of plan assets | $ 0 | $ 0 |

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