XML 120 R99.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Fair Value Measurements (Fair Value, Option, Quantitative Disclosures) (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) $ / MMBTU $ / MWh | Dec. 31, 2023 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | $ 1,399 |  | $ 1,350
Fair Value of Derivative Liabilities |  | 512 |  | 697
Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 375 |  | 298
Fair Value of Derivative Liabilities |  | 225 |  | 316
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 9,259 |  | 7,865
Total liabilities |  | 512 |  | 697
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 4,563 |  | 3,770
Total liabilities |  | 225 |  | 316
Fair Value, Measurements, Recurring | Commodity Contract |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 494 |  | 550
Fair Value of Derivative Liabilities |  | 123 |  | 299
Fair Value, Measurements, Recurring | Commodity Contract | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 115 |  | 117
Fair Value of Derivative Liabilities |  | 33 |  | 232
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 399 | [1] | 225
Total liabilities |  | 15 | [1] | 139
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Total assets |  | 70 | [1] | 21
Total liabilities |  | 2 | [1] | 137
Fair Value, Measurements, Recurring | Level 3 | Commodity Contract |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 399 |  | 225
Fair Value of Derivative Liabilities |  | 15 |  | 139
Fair Value, Measurements, Recurring | Level 3 | Commodity Contract | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets |  | 70 |  | 21
Fair Value of Derivative Liabilities |  | 2 |  | $ 137
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [1],[2] | 25 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Liabilities | [1],[2] | $ 25 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | (2) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Weighted average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [3] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Weighted average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Weighted average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Natural Gas | Weighted average | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2],[3] | (1) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | $ 38 |  |
Fair Value of Derivative Liabilities | [1] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | 38 |  |
Fair Value of Derivative Liabilities | [1] | $ 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (3) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (3) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (6) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Minimum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | (6) |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 11 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 11 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Maximum | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Weighted average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Weighted average | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1],[3] | 4 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Weighted average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | FTRs | Weighted average | Derivative Financial Instruments, Liabilities | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1],[3] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1] | $ 13 |  |
Fair Value of Derivative Liabilities | [1] | $ 248 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 37 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Minimum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 31 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 122 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Maximum | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MWh | [1] | 119 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Weighted average | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [3] | 55 |  |
Fair Value, Measurements, Recurring | Level 3 | Discounted cash flow | Commodity Contract | Electricity | Weighted average | Derivative Financial Instruments, Liabilities | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [3] | 66 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1],[2] | $ 88 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair Value of Derivative Assets | [1],[2] | $ 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 2 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 11.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Minimum | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 11.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Market Price |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 7 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Market Price | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Market Price | $ / MMBTU | [1],[2] | 6 |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 73.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Maximum | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [4] | 65.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Weighted average | Assets | Price Volatility |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [3] | 48.00% |  |
Fair Value, Measurements, Recurring | Level 3 | Option Model | Commodity Contract | Natural Gas | Weighted average | Assets | Price Volatility | Virginia Electric and Power Company |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Price volatility (percentage) | [3],[4] | 49.00% |  |
[1] | Represents market prices beyond defined terms for Levels 1 and 2.
[2] | Includes basis.
[3] | Averages weighted by volume.
[4] | Represents volatilities unrepresented in published markets.

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 assumptions, expected volatility rate for commodity contracts. + References No definition available. + Details
Name: | d_FairValueAssumptionsExpectedVolatilityRateForCommodityContracts
Namespace Prefix: | d_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value inputs, offered quotes for commodity contracts. + References No definition available. + Details
Name: | d_FairValueInputsOfferedQuotesForCommodityContracts
Namespace Prefix: | d_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

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/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-30 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-32 + Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
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: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ReserveQuantitiesByTypeOfReserveAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=d_MarketPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_EnergyAxis=d_FinancialTransmissionRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=d_PriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |