Pension and Other Post-Retirement Benefits Actual Asset Allocation (Details)	Dec. 31, 2018 Rate	Dec. 31, 2017 Rate
Other Postretirement Benefit Plans, Defined Benefit [Member]
Acutal Asset Allocation [Line Items]
Actual Equity Allocation	65.00%	69.00%
Actual Fixed Income Allocation	35.00%	31.00%
Total Actual Asset Allocation	100.00%	100.00%
Pension Plans, Defined Benefit [Member]
Acutal Asset Allocation [Line Items]
Actual Equity Allocation	61.00%	65.00%
Actual Fixed Income Allocation	39.00%	35.00%
Total Actual Asset Allocation	100.00%	100.00%