Pension and Other Postretirement Benefits (Schedule of Weighted Average Asset Allocations by Asset Category) (Details) - Pension Benefits	Jun. 30, 2021	Jun. 30, 2020
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	48.00%	51.00%
Fixed Income Investments
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	42.00%	21.00%
Other, including cash
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations percentage	10.00%	28.00%