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Significant Accounting Policies (Narrative) (Detail 1) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 USD ($) $ / shares | Jan. 31, 2022 USD ($) $ / shares | Dec. 31, 2023 USD ($) MWh $ / shares | Sep. 30, 2023 $ / shares | Jun. 30, 2023 $ / shares | Mar. 31, 2023 $ / shares | Mar. 31, 2022 USD ($) $ / shares | Dec. 31, 2023 USD ($) MWh $ / shares | Dec. 31, 2022 USD ($) MWh | Dec. 31, 2021 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Reversal of interest expense on uncertain tax positions effectively settled |  |  |  |  |  |  |  | $ 21,000,000 |  |
Reversal of penalty expense on uncertain tax positions effectively settled |  |  |  |  |  |  |  | 7,000,000 |  |
Margin deposit assets |  |  | $ 38,000,000 |  |  |  |  | 38,000,000 | $ 480,000,000 |
Margin liabilities |  |  | $ 15,000,000 |  |  |  |  | 15,000,000 | 0 |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  |  |  |  | $ 159,000,000 | $ 84,000,000 | $ 96,000,000
Increase in EPS | $ / shares |  |  | $ 0.07 | $ (0.02) | $ (0.01) | $ (0.02) |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  | 35 years |  |  |  |  | 35 years |  |
Estimated proved developed or proved gas and oil reserves rate per unit | MWh |  |  | 1.73 |  |  |  |  | 1.73 | 1.67 |
Cost saving incentive |  |  |  |  |  |  |  | $ 4,000,000 | $ 27,000,000 | 0
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 |  | $ (16,000,000) |  |  |  |  |  | (40,000,000) |  |
Increase (decrease) in depreciation expense, after tax |  | $ (12,000,000) |  |  |  |  |  | $ (30,000,000) |  |
Increase in EPS | $ / shares |  | $ 0.02 |  |  |  |  |  | $ 0.04 |  |
Revision of Estimated Useful Life | Non-jurisdictional and Certain Nonutility Solar Generation Facilities | Subsequent Event |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense | $ 15,000,000 |  |  |  |  |  |  |  |  |
Increase (decrease) in depreciation expense, after tax | $ 11,000,000 |  |  |  |  |  |  |  |  |
Increase in EPS | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  |  |  |  | 86.00% |  |
Margin deposit assets |  |  | $ 35,000,000 |  |  |  |  | $ 35,000,000 | 310,000,000 |
Margin liabilities |  |  | 0 |  |  |  |  | 0 | 0 |
Capitalized interest costs and Capitalized interest costs and AFUDC |  |  |  |  |  |  |  | 86,000,000 | 66,000,000 | 78,000,000
AFUDC recorded as regulatory asset |  |  |  |  |  |  |  |  | 34,000,000 | $ 35,000,000
Finite Lived Intangible Asset Useful Life |  | 35 years |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 25,000,000 | 167,000,000 |
Charges recorded with dismantling after tax |  |  |  |  |  |  |  | 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 |  |  |  |  | 1,000,000 |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax receivable |  |  | 40,000,000 |  |  |  |  | 40,000,000 |  |
Income tax payable |  |  |  |  |  |  |  |  | 22,000,000 |
Virginia Electric and Power Company | Affiliated Entity | Federal |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax receivable |  |  | 45,000,000 |  |  |  |  | 45,000,000 |  |
Income tax payable |  |  |  |  |  |  |  |  | 25,000,000 |
Virginia Electric and Power Company | Affiliated Entity | State |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax receivable |  |  |  |  |  |  |  |  | $ 3,000,000 |
Income tax payable |  |  | $ 5,000,000 |  |  |  |  | $ 5,000,000 |  |
DESC |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of fuel currently subject to deferred fuel accounting |  |  |  |  |  |  |  | 96.00% |  |

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