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Employee Benefit Plans (Asset Strategy Allocation) (Details)
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 100.00% 100.00%
Domestic Equity    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 27.00% 30.00%
International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 22.00% 24.00%
Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 11.00% 9.00%
Total Equity    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 60.00% 63.00%
Actual percentage of the fair value of total Plan assets held 66.00%  
Domestic Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 18.00% 16.00%
High Yield Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 9.00% 10.00%
Total Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 27.00% 26.00%
Actual percentage of the fair value of total Plan assets held 25.00%  
Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 5.00% 5.00%
Actual percentage of the fair value of total Plan assets held 5.00%  
Other    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets by strategy 8.00% 6.00%
Actual percentage of the fair value of total Plan assets held 4.00%  
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 100.00%  
Maximum | Domestic Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 40.00%  
Maximum | International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 25.00%  
Maximum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 15.00%  
Maximum | Total Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 70.00%  
Maximum | Domestic Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 40.00%  
Maximum | High Yield Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 25.00%  
Maximum | Total Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 65.00%  
Maximum | Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 10.00%  
Maximum | Other    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 15.00%  
Minimum | Domestic Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 20.00%  
Minimum | International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 10.00%  
Minimum | Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 0.00%  
Minimum | Total Equity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 40.00%  
Minimum | Domestic Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 10.00%  
Minimum | High Yield Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 0.00%  
Minimum | Total Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 10.00%  
Minimum | Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 0.00%  
Minimum | Other    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation range 0.00%