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Property, Plant and Equipment (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2024 USD ($) | Jul. 31, 2024 USD ($) a mi MW | Feb. 29, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 122,000,000 |  | $ 1,000,000 |  | $ 219,000,000 | $ 136,000,000
Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Additional capital contribution percentage |  |  | 67.00% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Additional capital contribution percentage |  |  | 83.00% |  |  |  |  |  |
Corporate Office Building |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of property, plant and equipment |  |  |  |  | $ 23,000,000 |  |  |  |
Level 3 | Corporate Office Building |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  |  | 23,000,000 |  | $ 35,000,000 |  |
Level 3 | Nonregulated renewable natural gas facilities | Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  | 1,000,000 | 1,000,000 |  |  | $ 1,000,000 |
Impairment of Assets and Other Charges | Corporate Office Building |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | 17,000,000 |  | 91,000,000 |  |
Asset impairment charges after tax |  |  |  |  | 12,000,000 |  | $ 68,000,000 |  |
Impairment of Assets and Other Charges | Nonregulated renewable natural gas facilities |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 27,000,000 | 33,000,000 |  |  |  |
Asset impairment charges after tax |  |  |  | 21,000,000 | $ 25,000,000 |  |  |  |
Acquisition of Wind Project |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Offshore wind project price expected |  | $ 160,000,000 |  |  |  |  |  |  |
Acquisition of Solar Project Foxhound Virginia |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Date Agreement Entered |  |  |  |  |  |  |  | 2023-03 |
Date Agreement Closed |  |  |  |  |  |  |  | February 2024 |
Date of Commercial Operations |  |  |  |  |  |  |  | April 2024 |
Acquisition Of Offshore Wind Project |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Date Agreement Entered |  |  |  |  |  |  |  | 2024-07 |
Date Agreement Closed |  |  |  |  |  |  |  | October 2024 |
Miles of area acquired | mi |  | 27 |  |  |  |  |  |  |
Acres of area acquired | a |  | 40,000 |  |  |  |  |  |  |
Power generating capacity | MW |  | 800 |  |  |  |  |  |  |
CVOW Commercial Project Excluding Financing Costs | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs | $ 9,800,000,000 |  |  |  |  |  |  |  |
CVOW Commercial Project Excluding Financing Costs Condition Two | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs | $ 11,300,000,000 |  |  |  |  |  |  |  |
Virginia Power and Stonepeak | Maximum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs |  |  | $ 11,300,000,000 |  |  |  |  |  |
Virginia Power and Stonepeak | CVOW Commercial Project |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Remaining capital percentage |  |  | 50.00% |  |  |  |  |  |
Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Percentage of proceeds from sale of non controlling interests in CVOW commercial project | 50.00% |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs |  |  | $ 13,700,000,000 |  |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 25,000,000 |  |  |  |  |
Asset impairment charges after tax |  |  |  | $ 18,000,000 |  |  |  |  |
Virginia Electric and Power Company | CVOW Commercial Project |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 50.00% |  |  |  |  |  |
Virginia Electric and Power Company | CVOW Commercial Project | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Initial withholding amount | $ 145,000,000 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | CVOW Commercial Project Excluding Financing Costs | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Initial withholding amount | 100,000,000 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | CVOW Commercial Project Excluding Financing Costs Condition Two | Subsequent Event |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of non controlling interests in CVOW commercial project | $ 2,600,000,000 |  |  |  |  |  |  |  |
Stonepeak | Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs |  |  | $ 11,300,000,000 |  |  |  |  |  |
Stonepeak | Maximum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total project costs |  |  | 13,700,000,000 |  |  |  |  |  |
Additional capital costs |  |  | $ 11,300,000,000 |  |  |  |  |  |

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