XML 88 R78.htm IDEA: XBRL DOCUMENT
v3.25.2

Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | $ 746 | $ 1,399
Total derivative liabilities |  | 204 | 512
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 321 | 375
Total derivative liabilities |  | 63 | 225
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 8,998 | 9,259
Total liabilities |  | 204 | 512
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 4,714 | 4,563
Total liabilities |  | 63 | 225
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 5,732 | 5,405
Fair Value, Measurements, Recurring | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 2,947 | 2,771
Fair Value, Measurements, Recurring | Equity securities: | International |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 173 | 165
Fair Value, Measurements, Recurring | Equity securities: | International | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 101 | 99
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 550 | 518
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 309 | 294
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,764 | 1,743
Fair Value, Measurements, Recurring | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,036 | 1,024
Fair Value, Measurements, Recurring | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 33 | 29
Fair Value, Measurements, Recurring | Cash Equivalents and Other | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 44 | 30
Total derivative liabilities |  | 9 | 192
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 44 | 30
Total derivative liabilities |  | 9 | 192
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 519 | 494
Total derivative liabilities |  | 129 | 123
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 206 | 115
Total derivative liabilities |  | 38 | 33
Fair Value, Measurements, Recurring | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 183 | 875
Total derivative liabilities |  | 66 | 197
Fair Value, Measurements, Recurring | Interest Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 71 | 230
Total derivative liabilities |  | 16 | 0
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 6,071 | 5,735
Total liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 3,132 | 2,953
Total liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 5,730 | 5,403
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 2,945 | 2,769
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | International |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 173 | 165
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | International | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 101 | 99
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 135 | 138
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 86 | 85
Fair Value, Measurements, Recurring | Level 1 | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 33 | 29
Fair Value, Measurements, Recurring | Level 1 | Cash Equivalents and Other | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 2,491 | 3,125
Total liabilities |  | 182 | 497
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 1,399 | 1,540
Total liabilities |  | 59 | 223
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 2 | 2
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 2 | 2
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | International |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | International | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 550 | 518
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 309 | 294
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,629 | 1,605
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 950 | 939
Fair Value, Measurements, Recurring | Level 2 | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Cash Equivalents and Other | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 44 | 30
Total derivative liabilities |  | 9 | 192
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 44 | 30
Total derivative liabilities |  | 9 | 192
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 83 | 95
Total derivative liabilities |  | 107 | 108
Fair Value, Measurements, Recurring | Level 2 | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 23 | 45
Total derivative liabilities |  | 34 | 31
Fair Value, Measurements, Recurring | Level 2 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 183 | 875
Total derivative liabilities |  | 66 | 197
Fair Value, Measurements, Recurring | Level 2 | Interest Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 71 | 230
Total derivative liabilities |  | 16 | 0
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 436 | 399
Total liabilities |  | 22 | 15
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 183 | 70
Total liabilities |  | 4 | 2
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | International |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | International | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Cash Equivalents and Other | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 436 | 399
Total derivative liabilities |  | 22 | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 183 | 70
Total derivative liabilities |  | 4 | 2
Fair Value, Measurements, Recurring | Level 3 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative assets |  | 0 | 0
Total derivative liabilities |  | $ 0 | $ 0
[1] | Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $208 million and $212 million of assets at Dominion Energy, inclusive of $74 million and $76 million at Virginia Power, at June 30, 2025 and December 31, 2024, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.

X
- Definition Derivative assets fair value. + References No definition available. + Details
Name: | d_DerivativeAssetsFairValue
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative liability fair value. + References No definition available. + Details
Name: | d_DerivativeLiabilityFairValue
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
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: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedIncomeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=d_GovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=d_CashEquivalentsAndOtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=us-gaap_ForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |