XML 97 R75.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Significant Accounting Policies (Depreciation Rates and Estimated Useful Life) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Nonregulated Generation-Nuclear | Minimum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 54 years |  |
Nonregulated Generation-Nuclear | Maximum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 64 years |  |
Nonregulated Generation Solar | Minimum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 30 years |  |
Nonregulated Generation Solar | Maximum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 35 years |  |
General and Other | Minimum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 5 years |  |
General and Other | Maximum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful lives | [1] | 50 years |  |
Generation |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | [2] | 2.65% | 2.71% | 2.63%
Generation | Virginia Electric and Power Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) |  | 2.75% | 2.84% | 2.69%
Transmission |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | [2] | 2.32% | 2.32% | 2.52%
Transmission | Virginia Electric and Power Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) |  | 2.29% | 2.29% | 2.51%
Distribution |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | [2] | 2.72% | 2.80% | 2.85%
Distribution | Virginia Electric and Power Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) |  | 2.78% | 2.76% | 3.18%
General and Other |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) | [2] | 4.20% | 4.31% | 4.36%
General and Other | Virginia Electric and Power Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Average composite depreciation rates on utility property, plant and equipment (percentage) |  | 4.60% | 4.78% | 5.08%
[1] | The estimated useful life for a generation station is made on a unit basis if the facility has multiple generating units and represents the period the unit was placed in service or acquired until the end of its license or estimated service period.
[2] | Excludes rates for depreciation reported as discontinued operations.

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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_PublicUtilityPropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=d_NonregulatedGenerationSolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricityGenerationPlantNonNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_GasTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_OtherPlantInServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |