POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Weighted Average Assumptions For The Benefit Calculations As Well As Assumed Health Care Trend Rates Balance Sheets (Details) |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Pension Benefits | ||
| Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] | ||
| Discount rate (in percent) | 4.60% | 4.20% |
| Rate of compensation increase (in percent) | 2.70% | 2.70% |
| Interest crediting rate for cash balance plans (in percent) | 4.60% | 4.60% |
| Other Retiree Benefits | ||
| Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] | ||
| Discount rate (in percent) | 6.00% | 5.90% |
| Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] | ||
| Health care cost trend rates assumed for next year (in percent) | 7.30% | 6.90% |
| Rate to which the health care cost trend rate is assumed to decline (ultimate trend rate) (in percent) | 5.60% | 5.40% |
| Year that the rate reaches the ultimate trend rate | 2031 | 2030 |