XML 107 R94.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 605 | $ 614 | $ 2,686 | $ 3,324
Realized gains | [1] | 17 | 25 | 132 | 405
Realized losses | [1] | 50 | 7 | 247 | 81
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 425 | 216 | 1,289 | 1,465
Realized gains | [1] | 14 | 17 | 40 | 213
Realized losses | [1] | $ 33 | $ 2 | $ 85 | $ 28
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

X
- Definition Debt and equity securities realized gains. + References No definition available. + Details
Name: | d_DebtAndEquitySecuritiesRealizedGains
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt and equity securities realized losses. + References No definition available. + Details
Name: | d_DebtAndEquitySecuritiesRealizedLosses
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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