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Benefit Plans
 3 Months Ended
Mar. 31, 2021
Benefit Plans [Abstract]  
Benefit Plans
9. Benefit Plans


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


The following table presents the components of net periodic benefit for these plans:

  
Pension Benefits
    
Other
Postretirement Benefits
  
Three Months Ended March 31
  
2021
    
2020
    
2021
    
2020
  
(In millions)
                        
                         
Service cost
  
$
1
    
$
1
              
Interest cost
    
18
      
23
              
Expected return on plan assets
    
(43
)
    
(43
)
  
$
(1
)
  
$
(1
)
Amortization of unrecognized net loss
    
12
      
11
                  
Settlement charge
            
4
                  
Net periodic benefit
  
$
(12
)
  
$
(4
)
  
$
(1
)
  
$
(1
)