Pension and Other Postretirement Benefits - Schedule of Weighted Average Asset Allocations by Asset Category (Details) - Pension benefits	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	100.00%	100.00%
Equity investments
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	31.00%	39.00%
Fixed income investments, including cash
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	61.00%	51.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	8.00%	10.00%