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, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (in percent)	4.20%	4.20%
Rate of compensation increase (in percent)	2.80%	2.90%
Interest crediting rate for cash balance plans (in percent)	4.70%	4.30%
Other Retiree Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (in percent)	5.80%	5.60%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rates assumed for next year (in percent)	6.30%	6.10%
Rate to which the health care cost trend rate is assumed to decline (ultimate trend rate) (in percent)	4.90%	4.50%
Year that the rate reaches the ultimate trend rate	2029	2028