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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Benefit Plans [Abstract]  
Components of Net Periodic Benefit Cost

The following table presents the components of net periodic (benefit) cost for the plans:

  
Pension Benefits
    
Other
Postretirement Benefits
  
Three Months Ended March 31
  
2020
    
2019
    
2020
    
2019
  
(In millions)
                        
                         
Service cost
  
$
1
    
$
2
              
Interest cost
    
23
      
29
          
$
1
  
Expected return on plan assets
    
(43
)
    
(40
)
  
$
(1
)
    
(1
)
Amortization of unrecognized net loss
    
11
      
11
                  
Settlement charge
    
4
                          
Net periodic (benefit) cost
  
$
(4
)
  
$
2
    
$
(1
)
  
$
-