EMPLOYEE BENEFIT PLANS - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Total	$ 2	$ 14	$ 16
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	6	12	18
Expected return on plan assets	(1)	(2)	(10)
Amortization of unrecognized items	0	3	8
Curtailment gain recognized	0	(6)	0
Settlement loss recognized	(2)	179	0
Total	4	187	17
Retirement Health Care
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	1	1	1
Expected return on plan assets	0	0	0
Amortization of unrecognized items	(2)	(2)	(2)
Curtailment gain recognized	0	0	0
Settlement loss recognized	0	0	0
Total	$ (1)	$ (1)	$ (1)