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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Components of Provision for Net Periodic Benefit Cost (Credit) The components of Dominion Energy’s provision for net periodic benefit cost (credit) are as follows:

 

 

Pension Benefits

 

 

Other Postretirement Benefits

 

 

 

Quarter-to-Date

 

 

Year-to-Date

 

 

Quarter-to-Date

 

 

Year-to-Date

 

Period Ended September 30,

 

2024

 

 

2023

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

19

 

 

$

24

 

 

$

63

 

 

$

72

 

 

$

2

 

 

$

3

 

 

$

8

 

 

$

10

 

Interest cost

 

 

107

 

 

 

111

 

 

 

324

 

 

 

332

 

 

 

15

 

 

 

15

 

 

 

43

 

 

 

46

 

Expected return on plan assets

 

 

(200

)

 

 

(216

)

 

 

(611

)

 

 

(648

)

 

 

(43

)

 

 

(37

)

 

 

(128

)

 

 

(113

)

Amortization of prior service
    cost (credit)

 

 

1

 

 

 

—

 

 

 

1

 

 

 

—

 

 

 

(9

)

 

 

(10

)

 

 

(27

)

 

 

(28

)

Amortization of net actuarial
    (gain) loss

 

 

3

 

 

 

—

 

 

 

16

 

 

 

—

 

 

 

(1

)

 

 

(1

)

 

 

(5

)

 

 

(4

)

Settlements and curtailments(1)

 

 

—

 

 

 

—

 

 

 

4

 

 

 

—

 

 

 

(1

)

 

 

—

 

 

 

(1

)

 

 

—

 

Plan amendment

 

 

—

 

 

 

—

 

 

 

22

 

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Net periodic benefit (credit) cost

 

$

(70

)

 

$

(81

)

 

$

(181

)

 

$

(244

)

 

$

(37

)

 

$

(30

)

 

$

(110

)

 

$

(89

)
(1)
2024 amount relates to Dominion Energy nonqualified pension plan.