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Significant Accounting Policies (Narrative) (Detail 1) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Feb. 29, 2024 USD ($) | Jan. 31, 2024 USD ($) $ / shares | Jan. 31, 2022 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Dec. 31, 2024 USD ($) MWh $ / shares | Sep. 30, 2024 $ / shares | Jun. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) $ / shares | Dec. 31, 2024 USD ($) MWh | Dec. 31, 2023 USD ($) MWh $ / shares | Dec. 31, 2022 USD ($) MWh
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Margin deposit assets |  |  |  |  | $ 104,000,000 |  |  |  |  |  | $ 104,000,000 | $ 38,000,000 |
Margin liabilities |  |  |  |  | $ 3,000,000 |  |  |  |  |  | 3,000,000 | 15,000,000 |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 | $ 307,000,000 | $ 1,401,000,000
Increase in EPS | $ / shares |  |  |  |  | $ (0.03) | $ (0.01) | $ (0.01) | $ (0.28) |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  |  |  | 35 years |  |  |  |  |  | 35 years |  |
Estimated proved developed or proved gas and oil reserves rate per unit | MWh |  |  |  |  | 1.83 |  |  |  |  |  | 1.83 | 1.73 | 1.67
Cost saving incentive |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 4,000,000 | $ 27,000,000
Non-jurisdictional and Certain Nonutility Solar Generation Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  | 35 years |  |  |  |  |  |  |  |  |  |
Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in EPS | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |
Revision of Estimated Useful Life | Non-jurisdictional and Certain Nonutility Solar Generation Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  | $ (17,000,000) | $ (16,000,000) |  |  |  |  |  |  |  |  | (35,000,000) |
Increase (decrease) in depreciation expense, after tax |  | $ (13,000,000) | $ (12,000,000) |  |  |  |  |  |  |  |  | $ (26,000,000) |
Increase in EPS | $ / shares |  | $ 0.02 | $ 0.02 |  |  |  |  |  |  |  |  | $ 0.03 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  |  |  |  |  |  |  | 87.00% |  |
Estimated under-recovered balances | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |
Margin deposit assets |  |  |  |  | $ 1,000,000 |  |  |  |  |  | 1,000,000 | $ 35,000,000 |
Margin liabilities |  |  |  |  | 0 |  |  |  |  |  | 0 | 0 |
AFUDC recorded as regulatory asset |  |  |  |  | $ 3,000,000 |  |  |  |  |  | $ 3,000,000 |  | 34,000,000
Finite Lived Intangible Asset Useful Life |  |  |  |  | 35 years |  |  |  |  |  | 35 years |  |
Percentage of remaining construction costs, including contingency |  |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |
Expected disallowance charge |  |  |  |  | $ 103,000,000 |  |  |  |  |  |  |  |
Expected disallowance charge after tax |  |  |  |  | 77,000,000 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Rider OSW |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated projected cost |  |  |  |  | 600,000,000 |  |  |  |  |  | $ 600,000,000 |  |
Increase for increased contingency for remaining construction activities |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |
Virginia Electric and Power Company | CVOW Commercial Project |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated projected cost |  |  |  | $ 600,000,000 | $ 10,700,000,000 |  |  |  |  |  | $ 10,700,000,000 |  |
Increase for increased contingency for remaining construction activities |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Percentage of remaining construction costs, including contingency |  |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  |  |  |  |  |  |  |  | $ (60,000,000) |  |  |
Increase (decrease) in depreciation expense, after tax |  |  |  |  |  |  |  |  |  | $ (45,000,000) |  |  |
Virginia Electric and Power Company | Revision of Estimated Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense |  |  | $ (6,000,000) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense, after tax |  |  | $ (4,000,000) |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Electric Generation Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Charges recorded with dismantling |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 | 25,000,000 | 167,000,000
Charges recorded with dismantling after tax |  |  |  |  |  |  |  |  |  |  | 30,000,000 | 19,000,000 | $ 124,000,000
Virginia Electric and Power Company | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
AFUDC recorded as regulatory asset |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | $ 191,000,000 |  | 25,000,000 |  |
Impairment of assets and other charges after tax |  |  |  |  |  |  |  |  | $ 142,000,000 |  | 18,000,000 |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes receivable |  |  |  |  | $ 26,000,000 |  |  |  |  |  | 26,000,000 | 40,000,000 |
Virginia Electric and Power Company | Affiliated Entity | Federal |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes receivable |  |  |  |  | 21,000,000 |  |  |  |  |  | 21,000,000 | 45,000,000 |
Virginia Electric and Power Company | Affiliated Entity | State |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes receivable |  |  |  |  | $ 5,000,000 |  |  |  |  |  | $ 5,000,000 |  |
Income taxes payable |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |

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