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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract] |  |  |  |
Defined benefit pension plans | $ 69 | $ 92 | $ 209 | $ 274
Defined contribution plans | 278 | 240 | 853 | 722
Postretirement healthcare plans | 22 | 20 | 65 | 64
Retirement plans costs | $ 369 | $ 352 | $ 1,127 | $ 1,060

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