Employee Benefit Plans (Pension Plan Asset Allocation by Asset Category) (Details)	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	100.00%	100.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	1.00%	1.00%
United States Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	44.00%	44.00%
United States Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	17.00%	17.00%
International Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	13.00%	13.00%
Global Equity Securities [Domain]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	25.00%	25.00%