RETIREMENT BENEFIT OBLIGATIONS - Schedule of Health Care Cost Trend Rates (Details) - Postretirement Benefits	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	8.00%	6.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.40%
Year that the rate reaches the ultimate trend rate	2041	2031

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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