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PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Assumed Health Care Cost Trend Rates (Details) - Other than Pension Plans
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Assumed health care cost trend rates    
Weighted-average interest crediting rates (as a percent) 4.02% 4.02%
Assumed weighted-average health care cost trend rate for the coming year (as a percent) 5.78%  
Weighted-average ultimate trend rate (as a percent) 4.40%  
Minimum    
Assumed health care cost trend rates    
Period after which ultimate trend rate is expected to be reached 19 years  
Maximum    
Assumed health care cost trend rates    
Period after which ultimate trend rate is expected to be reached 25 years