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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contributions to qualified defined benefit pension plans and OPEB plans |  | $ 0 |
Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contributions to qualified defined benefit pension plans and OPEB plans |  | 0 |
Voluntary Retirement Program |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | $ 423,000,000 |  |
Voluntary retirement program related charges net of tax | 316,000,000 |  |
Voluntary Retirement Program | Other Operations and Maintenance |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 288,000,000 |  |
Voluntary Retirement Program | Other Taxes |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 23,000,000 |  |
Voluntary Retirement Program | Other Income |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 112,000,000 |  |
Voluntary Retirement Program | Virginia Electric and Power Company |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 194,000,000 |  |
Voluntary retirement program related charges net of tax | 144,000,000 |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other Operations and Maintenance |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 186,000,000 |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other Taxes |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 8,000,000 |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 74,000,000 |  |
Voluntary retirement program related charges net of tax | 58,000,000 |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other Operations and Maintenance |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 39,000,000 |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other Taxes |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 2,000,000 |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other Income |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | 1,000,000 |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Net income loss from discontinued operations |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Voluntary retirement program related charges | $ 32,000,000 |  |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 |  | 0 |
Pension Benefits | Scenario Forecast |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 |  |  | $ 250,000,000
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 |  | 0 |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 |  | 12,000,000 |
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected contribution defined benefit pension plans and OPEB plans through VEBAs for the remainder of 2020 |  | $ 12,000,000 |

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- Definition Defined benefit plan cost of providing special or contractual termination benefit recognized during period net of tax. + References No definition available. + Details
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- Definition Amount of cost of providing special or contractual termination benefits payable from defined benefit plan. + 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 (q) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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