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RETIREMENT PLANS - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2025 | Aug. 31, 2024
Retirement Benefits [Abstract] |  |
Defined benefit pension plans | $ 47 | $ 70
Defined contribution plans | 306 | 287
Postretirement healthcare plans | 22 | 22
Retirement plans costs | $ 375 | $ 379

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