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Goodwill and Intangible Assets (Components of Intangible Assets) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Goodwill And Intangible Assets Disclosure [Abstract] |  |
RGGI allowance purchased and consumed |  | $ 613
Renewable energy credits consumed | $ 370 | $ 209
RGGI allowances retired | $ 198 |

X
- Definition Allowance of acquisition of intangible assets. + References No definition available. + Details
Name: | d_AllowanceOfAcquisitionOfIntangibleAssets
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Allowance of acquisition of intangible assets renewable energy credits consumed. + References No definition available. + Details
Name: | d_AllowanceOfAcquisitionOfIntangibleAssetsRenewableEnergyCreditsConsumed
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Allowance of acquisition of intangible assets retired. + References No definition available. + Details
Name: | d_AllowanceOfAcquisitionOfIntangibleAssetsRetired
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration