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Pension and Other Postretirement Benefits (Weighted Average Discount Rates used to Calculate the Benefit Obligations (Details) - Other Postretirement Benefits
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligations, discount rate 4.50% 3.80% 4.00%
Service cost, discount rate 4.90% 5.00% 4.90%
Interest Cost, discount rate 4.10% 3.50% 3.60%