Pensions and Other Postretirement Plans (Asset Allocation) (Details 8) - Pension Plans [Member]	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	100.00%	100.00%
U.S. equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	58.00%	62.00%
Private investment fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	18.00%	7.00%
U.S. stock index fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	9.00%	14.00%
International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	8.00%	7.00%
U.S. fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets Allocation (Percent)	7.00%	10.00%