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Employee Benefit Plans (Tables)
Nov. 18, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost (Credit)
The components of Dominion Energy’s provision for net periodic benefit cost (credit) were as follows:
                                 
 
Pension Benefits
   
Other Postretirement Benefits
 
 
2019
 
  
2018
   
2019
 
  
2018
 
(millions)
 
 
  
 
  
 
  
 
Three Months Ended September 30,
 
 
 
  
 
 
  
 
 
  
 
 
Service cost
 
$
41
 
   $
39
   
$
7
 
   $
7
 
Interest cost
 
 
97
 
    
85
   
 
17
 
    
14
 
Expected return on plan assets
 
 
(177
)
   
(165
 )  
 
(37
)
   
(36
 )
Amortization of prior service credit
 
 
—
 
    
—
   
 
(13
)
   
(13
 )
Amortization of net actuarial loss
 
 
42
 
    
48
   
 
2
 
    
3
 
Settlements
(1)
  
 
2
 
    
—
   
 
—
 
    
—
 
                                 
Net periodic benefit cost (credit)
 
$
5
 
   $
7
   
$
(24
)
  $
(25
 )
                                 
Nine Months Ended September 30,
 
 
 
  
 
 
  
 
 
  
 
 
Service cost
 
$
           121
 
   $
           118
   
$
20
 
   $
             20
 
Interest cost
 
 
296
 
    
253
   
 
            51
 
    
42
 
Expected return on plan assets
 
 
(530
)
   
(498
 )  
 
(105
)
   
(107
 )
Amortization of prior service cost (credit)
 
 
1
 
    
1
   
 
(39
)
   
(39
 )
Amortization of net actuarial loss
 
 
124
 
    
145
   
 
9
 
    
8
 
Settlements and curtailment
(1)
  
 
75
 
    
—
   
 
42
 
    
—
 
                                 
Net periodic benefit cost (credit)
 
$
87
 
   $
19
   
$
(22
)
  $
(76
 )
                                 
 
 
 
 
 
(1)
Primarily related to a voluntary retirement program.
 
Dominion Energy Gas Holdings, LLC  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost (Credit)
The components of Dominion Energy Gas’ provision for net periodic benefit cost (credit) for employees represented by collective bargaining units were as follows:
                                 
 
Pension Benefits
   
Other Postretirement Benefits
 
 
2019
 
  
2018
   
2019
 
  
2018
 
(millions)
 
 
  
 
  
 
  
 
Three Months Ended September 30,
 
 
 
  
 
 
  
 
 
  
 
 
Service cost
 
$
4
 
   $
4
   
$
—
 
   $
1
 
Interest cost
 
 
7
 
    
7
   
 
3
 
    
3
 
Expected return on plan assets
 
 
(38
)
   
(36
 )  
 
(6
)
   
(7
 )
Amortization of prior service credit
 
 
—
 
    
—
   
 
(1
)
   
(1
 )
Amortization of net actuarial loss
 
 
5
 
    
4
   
 
—
 
    
—
 
                                 
Net periodic benefit credit
 
$
(22
)
  $
(21
 )  
$
(4
)
  $
(4
 )
                                 
Nine Months Ended September 30,
 
 
 
  
 
 
  
 
 
  
 
 
Service cost
 
$
12
 
   $
13
   
$
2
 
   $
3
 
Interest cost
 
 
            23
 
    
            21
   
 
              8
 
    
              8
 
Expected return on plan assets
 
 
(116
)
   
(111
 )  
 
(20
)
   
(21
 )
Amortization of prior service credit
 
 
—
 
    
—
   
 
(3
)
   
(3
 )
Amortization of net actuarial loss
 
 
15
 
    
14
   
 
2
 
    
2
 
Curtailment
(1)
  
 
1
 
    
—
   
 
1
 
    
—
 
                                 
Net periodic benefit credit
 
$
(65
)
  $
(63
 )  
$
(10
)
  $
(11
 )
                                 
 
 
 
 
 
(1)
Related to a voluntary retirement program.