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EMPLOYEE BENEFIT PLANS (Components of the Net Cost of Retirement Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]        
Weighted average long-term expected rate or return on plan assets     3.90%  
Other Postretirement Benefits Plan [Member] | Retirement Income Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 5 6 10 12
Expected return on plan assets (5) (5) (9) (9)
Amortization of unrecognized items 2 3 4 5
Total $ 2 $ 4 $ 5 $ 8