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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Benefit Cost (Credit) | The service cost component and non-service cost components of net periodic benefit (credit) cost are reflected in other operations and maintenance expense and other income, respectively, in the Consolidated Statements of Income. The components of Dominion Energy’s provision for net periodic benefit cost (credit) are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 43 |  |  | $ | 40 |  |  | $ | 7 |  |  | $ | 6 |
Interest cost |  |  | 90 |  |  |  | 98 |  |  |  | 15 |  |  |  | 17 |
Expected return on plan assets |  |  | (192 | ) |  |  | (176 | ) |  |  | (39 | ) |  |  | (35 | )
Amortization of prior service cost (credit) |  |  | 1 |  |  |  | 1 |  |  |  | (13 | ) |  |  | (13 | )
Amortization of net actuarial loss |  |  | 48 |  |  |  | 43 |  |  |  | 2 |  |  |  | 3 |
Settlement and curtailment(1) |  |  | 2 |  |  |  | 71 |  |  |  | — |  |  |  | 42 |
Net periodic benefit cost (credit) |  | $ | (8 | ) |  | $ | 77 |  |  | $ | (28 | ) |  | $ | 20 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 86 |  |  | $ | 80 |  |  | $ | 14 |  |  | $ | 13 |
Interest cost |  |  | 181 |  |  |  | 199 |  |  |  | 30 |  |  |  | 34 |
Expected return on plan assets |  |  | (385 | ) |  |  | (353 | ) |  |  | (78 | ) |  |  | (68 | )
Amortization of prior service cost (credit) |  |  | 1 |  |  |  | 1 |  |  |  | (25 | ) |  |  | (26 | )
Amortization of net actuarial loss |  |  | 97 |  |  |  | 82 |  |  |  | 3 |  |  |  | 7 |
Settlement and curtailment(1) |  |  | 2 |  |  |  | 73 |  |  |  | — |  |  |  | 42 |
Net periodic benefit cost (credit) |  | $ | (18 | ) |  | $ | 82 |  |  | $ | (56 | ) |  | $ | 2 |
(1) 2019 amounts relate primarily 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 service cost component and non-service cost components of net periodic benefit (credit) cost are reflected in other operations and maintenance expense and other income, respectively, in the Consolidated Statements of Income. The components of Dominion Energy Gas’ provision for net periodic benefit cost (credit) for employees represented by collective bargaining units are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1 |
Interest cost |  |  | 2 |  |  |  | 8 |  |  |  | 1 |  |  |  | 2 |
Expected return on plan assets |  |  | (14 | ) |  |  | (39 | ) |  |  | (5 | ) |  |  | (7 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Amortization of net actuarial loss |  |  | 2 |  |  |  | 5 |  |  |  | 1 |  |  |  | 1 |
Curtailment(1) |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Net periodic benefit credit |  | $ | (8 | ) |  | $ | (21 | ) |  | $ | (4 | ) |  | $ | (3 | )
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3 |  |  | $ | 8 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost |  |  | 5 |  |  |  | 16 |  |  |  | 2 |  |  |  | 5 |
Expected return on plan assets |  |  | (28 | ) |  |  | (78 | ) |  |  | (10 | ) |  |  | (14 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | (2 | )
Amortization of net actuarial loss |  |  | 4 |  |  |  | 10 |  |  |  | 1 |  |  |  | 2 |
Curtailment(1) |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Net periodic benefit credit |  | $ | (16 | ) |  | $ | (43 | ) |  | $ | (8 | ) |  | $ | (6 | )
(1) 2019 amounts relate to a voluntary retirement program.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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