EMPLOYEE BENEFIT PLANS (Components of the Net Cost of Retirement Income and Health Care Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Total	$ 10	$ 14	$ 0
Retirement Income [Member] | Retirement Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	20	23	23
Expected return on plan assets	(19)	(18)	(19)
Amortization of unrecognized items	10	9	10
Total	12	15	15
Retirement Health Care [Member] | Retirement Health Care [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	1	2	2
Expected return on plan assets	0	0	0
Amortization of unrecognized items	(3)	(3)	(3)
Total	$ (2)	$ (1)	$ (1)