Benefits Plans (Asset Allocation Parameters by Asset Class) (Details)	Dec. 31, 2019
Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	59.00%
Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	40.00%
Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	60.00%
Large-Cap U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	47.00%
Mid/Small-Cap U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	12.00%
Non-U.S [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	0.00%
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	41.00%
Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	40.00%
Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	60.00%
Long/Short Duration [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	39.00%
Money Market/Certificates of Deposit [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	2.00%