RETIREMENT PLANS - Schedule of Retirement Plan MTM Adjustments (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2026 |
May 31, 2025 |
May 31, 2024 |
|
| Retirement Benefits [Abstract] | |||
| Actual versus expected return on assets | $ (1,386) | $ 75 | $ (67) |
| Discount rate change | 462 | (1,024) | (1,139) |
| Demographic experience: | |||
| Current year actuarial loss | 230 | 196 | 67 |
| Change in future assumptions | 64 | 247 | 577 |
| Pension plan amendments, including curtailment gains | (17) | (9) | 1 |
| Total retirement plans MTM adjustments | $ (647) | $ (515) | $ (561) |