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Leases (Lease Assets and Liabilities Recorded in Consolidated Balance Sheets) (Parenthetical) (Detail) $ in Millions | Sep. 30, 2019 USD ($)
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Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | $ 39
Virginia Electric and Power Company |
Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | 3
Dominion Energy Gas Holdings, LLC |
Lessee Lease Disclosure [Line Items] |
Finance lease assets, accumulated amortization | $ 2

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- Definition Finance lease right of use asset accumulated amortization. + References No definition available. + Details
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Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, lease, disclosure. + References No definition available. + Details
Name: | d_LesseeLeaseDisclosureLineItems
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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