XML 84 R68.htm IDEA: XBRL DOCUMENT
v3.20.2

Operating Revenue (Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized) (Detail1) $ in Millions | Sep. 30, 2020 USD ($)
--- | ---
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 787
Virginia Electric and Power Company |
Revenues From Contract With Customer [Line Items] |
Revenue, expected to be recognized on multi-year contracts | $ 2

X
- Definition Revenues from contract with customer. + References No definition available. + Details
Name: | d_RevenuesFromContractWithCustomerLineItems
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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