RETIREMENT BENEFIT OBLIGATIONS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement benefits liability	$ 62	$ 38
Net periodic benefit costs	3	10	$ 28
Pension plan contributions for next fiscal year	$ 1
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	5.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	87.00%
Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	8.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated pension benefit obligations	$ 759	$ 818