XML 167 R146.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | $ 6,075 | [1] | $ 5,427 |
Obligations incurred during the period |  | 1,126 | [2] | 16 |
Obligations settled during the period |  | (347) |  | (193) |
Revisions in estimated cash flows |  | 300 | [3] | 603 | [4]
Accretion |  | 272 |  | 222 |
AROs, Ending balance | [1] | 7,426 |  | 6,075 |
Virginia Electric and Power Company |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | 4,653 | [1] | 4,093 |
Obligations incurred during the period |  | 469 | [2] | 9 |
Obligations settled during the period |  | (259) |  | (169) |
Revisions in estimated cash flows |  | 342 | [3] | 564 | [4]
Accretion |  | 192 |  | 156 |
AROs, Ending balance | [1] | $ 5,397 |  | $ 4,653 |
[1] | Includes $434 million and $352 million reported in other current liabilities for Dominion Energy at December 31, 2023 and 2024, respectively.
[2] | Primarily reflects AROs related to CCR remediation as discussed below.
[3] | Primarily reflects revisions for increased costs related to the completion of nuclear decommissioning cost studies for Millstone, Surry and North Anna inclusive of a charge of $122 million ($89 million after-tax) within impairment of assets and other charges in Dominion Energy’s Consolidated Statements of Income (reflected in the Corporate and Other segment). In addition, there were downward revisions for CCR remediation costs at Dominion Energy and future ash pond and landfill closure costs of certain electric generation facilities at Virginia Power.
[4] | Primarily reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities at Virginia Power as discussed below. In addition, Dominion Energy recorded a $48 million increase to its AROs to reflect a revision in the estimated cash flows following the approval of closure plans for a DESC generation facility previously taken out of service. Dominion Energy also recorded a decrease of $125 million to its AROs due to a revision in the timing of expected cash flows associated with the expected approval of a 20-year useful life extension of Millstone Units 2 and 3. Concurrently, Dominion Energy reevaluated its estimated cash flows associated with Millstone Unit 1, which resulted in an increase to its AROs of $83 million. As a result, Dominion Energy recorded a charge of $83 million ($60 million after-tax) within impairment of assets and other charges in its Consolidated Statements of Income (reflected in the Corporate and Other segment).

X
- Definition Asset Retirement Obligations [Line Items] + References No definition available. + Details
Name: | d_AssetRetirementObligationsLineItems
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_AssetRetirementObligationAccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_AssetRetirementObligationLiabilitiesIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_AssetRetirementObligationLiabilitiesSettled
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_AssetRetirementObligationRevisionOfEstimate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |