Pensions and Other Postretirement Benefits (Plan Assets) (Details)	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	100.00%	100.00%
Pension Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	48.00%	50.00%
Pension Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	42.00%	37.00%
Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10.00%	13.00%
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.00%	0.00%
OPEB Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.00%	0.00%
OPEB Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.00%	0.00%
OPEB Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.00%	0.00%