EMPLOYEE BENEFIT PLANS (Components of the Net Cost of Retirement Income and Health Care Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Total	$ 14
Retirement Health Care [Member] | Retirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	$ 0
Interest cost	2	2	2
Expected return on plan assets	0	0	0
Amortization of unrecognized items	(3)	(3)	(2)
Total	(1)	(1)	0
Retirement Income Plans [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	23	23	22
Expected return on plan assets	(18)	(19)	(20)
Amortization of unrecognized items	9	10	11
Total	$ 15	$ 15	$ 14