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Employee Benefit Plans - Narrative (Details)
employee in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
employee
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
employee
Sep. 30, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 5,345 $ 0 $ 7,798 $ 0
Other Postretirement and Postemployment Benefits        
Restructuring Cost and Reserve [Line Items]        
Special termination benefit charge 1,260 $ 0 $ 1,260 $ 0
Increase in benefit obligation related to special termination benefit charge $ 1,300      
Voluntary early retirement and separation programs        
Restructuring Cost and Reserve [Line Items]        
Number of employees participating | employee 18   18  
Restructuring charges $ 3,100      
Voluntary early retirement and separation programs | Special termination benefits        
Restructuring Cost and Reserve [Line Items]        
Special termination benefit charge 1,300      
Voluntary early retirement and separation programs | Separation payments and healthcare benefits        
Restructuring Cost and Reserve [Line Items]        
Cash payments disbursed to participants 543      
Voluntary early retirement and separation programs | Unpaid vacation and other benefits        
Restructuring Cost and Reserve [Line Items]        
Cash payments disbursed to participants $ 270