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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2024 | Nov. 30, 2023
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract] |  |  |  |
Defined benefit pension plans | $ 70 | $ 91 | $ 140 | $ 182
Defined contribution plans | 288 | 242 | 575 | 482
Postretirement healthcare plans | 21 | 21 | 43 | 44
Retirement plans costs | $ 379 | $ 354 | $ 758 | $ 708

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