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RETIREMENT PLANS - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2025 | Nov. 30, 2024 | Nov. 30, 2025 | Nov. 30, 2024
Retirement Benefits [Abstract] |  |  |  |
Defined benefit pension plans | $ 46 | $ 70 | $ 93 | $ 140
Defined contribution plans | 312 | 288 | 618 | 575
Postretirement healthcare plans | 23 | 21 | 45 | 43
Retirement plans costs | $ 381 | $ 379 | $ 756 | $ 758

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