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Pensions and Other Postretirement Plans (Key Assumptions - Obligation) (Details 3)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plans [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (percent) 3.30% 4.30%  
Cash balance interest crediting rate 2.77% 3.50%  
Ultimate cash balance interest crediting rate 3.30% 4.30%  
Year that reaches ultimate cash balance interest crediting rate 2022 2021  
Supplemental Executive Retirement Plan (SERP) [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (percent) 3.30% 4.30%  
Cash balance interest crediting rate 0.00% 0.00%  
Maximum [Member] | Pension Plans [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00%  
Maximum [Member] | Pension Plans [Member] | Periodic Cost [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00% 5.00%
Maximum [Member] | Supplemental Executive Retirement Plan (SERP) [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00%  
Maximum [Member] | Supplemental Executive Retirement Plan (SERP) [Member] | Periodic Cost [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00% 5.00%
Minimum [Member] | Pension Plans [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00%  
Minimum [Member] | Pension Plans [Member] | Periodic Cost [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00% 1.00%
Minimum [Member] | Supplemental Executive Retirement Plan (SERP) [Member] | Benefit Obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00%  
Minimum [Member] | Supplemental Executive Retirement Plan (SERP) [Member] | Periodic Cost [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00% 1.00%