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v3.20.2

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Statement Of Cash Flows [Abstract] |  |
Financing leases | $ 42 | $ 98
Operating leases | $ 3 | $ 4
Supplemental line of credit facility borrowings expiration period | 364 days |

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- Definition Financing leases. + References No definition available. + Details
Name: | d_FinancingLeases
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating leases. + References No definition available. + Details
Name: | d_OperatingLeases
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Supplemental line of credit facility expiration period. + References No definition available. + Details
Name: | d_SupplementalLineOfCreditFacilityExpirationPeriod
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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