EMPLOYEE BENEFIT PLANS - Schedule of Net Actuarial Loss (Gain) Recorded in Accumulated Other Comprehensive Net (Loss) Income (Details) $ in Millions	12 Months Ended
	Jun. 30, 2025 USD ($)
Other Postretirement Benefits Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net actuarial loss (gain) as of beginning of year	$ 19
Amortization, curtailment and settlement during the year	0
Loss (gain) during the year	0
Net actuarial loss (gain) as of end of year	19
Retirement Health Care
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net actuarial loss (gain) as of beginning of year	(14)
Amortization, curtailment and settlement during the year	2
Loss (gain) during the year	(2)
Net actuarial loss (gain) as of end of year	$ (14)