RETIREMENT PLANS - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2025 |
May 31, 2024 |
May 31, 2023 |
|
| Retirement Benefits [Abstract] | |||
| Actual versus expected return on assets | $ 75 | $ (67) | $ 2,492 |
| Discount rate change | (1,024) | (1,139) | (3,395) |
| Demographic experience: | |||
| Current year actuarial loss | 196 | 67 | 142 |
| Change in future assumptions | 247 | 577 | 110 |
| Pension plan amendments, including curtailment gains | (9) | 1 | 1 |
| Total MTM gain | $ (515) | $ (561) | $ (650) |