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Benefit Plans
 9 Months Ended
Sep. 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 table presents the components of net periodic (benefit) cost for the defined benefit plans:

  
Pension Benefits
  
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
   
2021
    
2020
    
2021
    
2020
  
(In millions)
                        
                         
Service cost
   $ 1    
     
$
2
    
$
2
  
Interest cost
    
17
    
$
24
      
53
      
70
  
Expected return on plan assets
    
(41
)
    
(43
)
    
(127
)
    
(130
)
Amortization of unrecognized net loss
    
12
      
12
      
37
      
35
  
Amortization of unrecognized prior service cost
                            
1
  
Settlement charge
            
1
      
2
      
8
  
Regulatory asset decrease
     1               1          
Net periodic benefit
  
$
(10
)
  
$
(6
)
  
$
(32
)
  
$
(14
)


The net periodic benefit for other postretirement benefits was $1 million for the three months ended September 30, 2021 and the nine months ended September 30, 2021 and 2020. There was no net periodic benefit for the three months ended September 30, 2020.