Pension and Other Postretirement Benefits (Schedule of Weighted Average Asset Allocations by Asset Category) (Details) - Pension Benefits	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations	47.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations	18.00%
Other, including cash
Defined Benefit Plan Disclosure [Line Items]
Benefit plan weighted-average asset allocations	35.00%