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Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | $ 5,333 | [1] | $ 5,221 |
Obligations incurred during the period |  | 138 |  | 28 |
Obligations settled during the period |  | (125) |  | (155) |
Revisions in estimated cash flows |  | 46 | [2] | 80 | [3]
Accretion |  | 210 |  | 208 |
Sale of non-wholly-owned nonregulated solar facilities |  |  |  | (49) |
Sales of Kewaunee and Hope |  | (175) |  |  |
AROs, Ending balance | [1] | 5,427 |  | 5,333 |
Virginia Electric and Power Company |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | 3,923 | [1] | 3,820 |
Obligations incurred during the period |  | 132 |  | 26 |
Obligations settled during the period |  | (155) |  | (131) |
Revisions in estimated cash flows |  | 48 | [2] | 67 | [3]
Accretion |  | 145 |  | 141 |
AROs, Ending balance | [1] | $ 4,093 |  | $ 3,923 |
[1] | Includes $196 million and $365 million reported in other current liabilities for Dominion Energy at December 31, 2021 and 2022, respectively.
[2] | Primarily reflects revisions to asbestos abatement costs associated with the early retirement of certain retired electric generation facilities.
[3] | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities, and additionally for Dominion Energy estimated cash flow projections associated with the recovery of spent nuclear fuel costs for its AROs associated with the decommissioning of Kewaunee and estimated cash flow projections associated with DESC's gas distribution pipelines. For Dominion Energy, these revisions in 2021 resulted in a charge of $44 million ($35 million after-tax) within other operations and maintenance expense in the Consolidated Statements of Income as well as a $25 million decrease to property, plant and equipment, net.

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- Definition Asset retirement obligation sale of non wholly owned non regulated solar facilities. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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