Pension and Other Postretirement Benefits Costs - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Assumptions for net periodic benefit cost:
Weighted-average discount rate	3.44%	3.85%	4.00%
Assumptions for year-end funded status:
Weighted-average discount rate	4.13%	3.44%	3.85%
Pension Plan [Member]
Assumptions for net periodic benefit cost:
Weighted-average discount rate	3.51%	3.99%	4.17%
Expected long-term rate of return	7.50%	7.50%	7.50%
Assumptions for year-end funded status:
Weighted-average discount rate	4.20%	3.52%	4.00%
Expected long-term rate of return	7.50%	7.50%	7.50%
Minimum [Member] | Pension Plan [Member]
Assumptions for net periodic benefit cost:
Rate of Compensation Increase	3.25%	3.25%	3.25%
Assumptions for year-end funded status:
Rate of Compensation Increase	3.25%	3.25%	3.25%
Maximum [Member] | Pension Plan [Member]
Assumptions for net periodic benefit cost:
Rate of Compensation Increase	4.50%	4.50%	4.50%
Assumptions for year-end funded status:
Rate of Compensation Increase	3.50%	4.50%	4.50%