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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Benefit Plans [Abstract]  
Components of Net Periodic (Benefit) Cost

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
)