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Benefit Plans
 6 Months Ended
Jun. 30, 2021
Benefit Plans [Abstract]  
Benefit Plans
8. Benefit Plans


The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees.


The following tables present the components of net periodic (benefit) cost for these plans:

  
Pension Benefits
  
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2021
    
2020
    
2021
    
2020
  
(In millions)
                        
                         
Service cost
        
$
1
    
$
1
    
$
2
  
Interest cost
  
$
18
      
23
      
36
      
46
  
Expected return on plan assets
    
(43
)
    
(44
)
    
(86
)
    
(87
)
Amortization of unrecognized net loss
    
13
      
12
      
25
      
23
  
Amortization of unrecognized prior service cost
            
1
              
1
  
Settlement charge
    
2
      
3
      
2
      
7
  
Net periodic benefit
  
$
(10
)
  
$
(4
)
  
$
(22
)
  
$
(8
)

 
Other Postretirement Benefits
  
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2021
    
2020
    
2021
    
2020
  
(In millions)
                        
                         
Interest cost
  
$
1
    
$
1
    
$
1
    
$
1
  
Expected return on plan assets
            
(1
)
    
(1
)
    
(2
)
Net periodic (benefit) cost
  
$
1
    
$
-
    
$
-
    
$
(1
)