Employee Benefit Plans (Target and Actual Asset Allocation for Pension Plan by Asset Category) (Details) - Employee Pension Plans [Member]	Dec. 31, 2019	Dec. 31, 2018
Pension Plan Assets
Target asset allocation (as a percent)	100.00%
Actual asset allocation (as a percent)	100.00%	100.00%
Cash [Member]
Pension Plan Assets
Target asset allocation (as a percent)	5.00%
Actual asset allocation (as a percent)	4.00%	3.00%
Domestic Equity Funds
Pension Plan Assets
Target asset allocation (as a percent)	45.00%
Actual asset allocation (as a percent)	47.00%	50.00%
International Equity Funds
Pension Plan Assets
Target asset allocation (as a percent)	18.00%
Actual asset allocation (as a percent)	18.00%	27.00%
Fixed Income Funds
Pension Plan Assets
Target asset allocation (as a percent)	32.00%
Actual asset allocation (as a percent)	31.00%	20.00%