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Employee Postretirement Benefits (Weighted-Average Assumptions) (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Pension Plans        
Net cost, Discount rate   3.23% 3.19% 3.91%
Net cost, Expected long-term return on plan assets   4.50% 4.46% 4.84%
Net cost, Rate of compensation increase   2.27% 2.29% 2.32%
Benefit obligations, Discount rate   3.40% 3.10%  
Benefit obligations, Rate of compensation increase   3.08% 2.27%  
Defined Benefit Pension Plans | Scenario, Forecast        
Net cost, Discount rate 3.40%      
Net cost, Expected long-term return on plan assets 4.39%      
Net cost, Rate of compensation increase 3.08%      
Other Postretirement Benefit Plans        
Net cost, Discount rate   3.91% 4.29% 4.59%
Net cost, Expected long-term return on plan assets   0.00% 0.00% 0.00%
Net cost, Rate of compensation increase   0.00% 0.00% 0.00%
Benefit obligations, Discount rate   4.50% 3.91%  
Benefit obligations, Rate of compensation increase   0.00% 0.00%