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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Significant Accounting Policies [Line Items] |  |  |  |
Changes in net unrecognized pension and other postretirement benefit costs (credits), net of tax | $ 2 | $ 0 | $ 0 |
Changes in net unrecognized pension and other postretirement benefit costs (credits), tax | (1) |  | (1) |
Net pension and other postretirement benefit costs (credits), net of tax | (12) | (13) | (13) |
Net pension and other postretirement benefit costs (credits), tax | 4 | 5 | 5 |
Increase (decrease) in assets held for sale |  | 48 |  |
Accrued unbilled revenue | 797 | 1,000 |  |
Cumulative decrease of retained earnings with related to mark-to-market- impacts |  |  |  | $ (1,200)
Change In Method of Accounting for Employee Benefit Plan Market-Related Impacts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Changes in net unrecognized pension and other postretirement benefit costs (credits), net of tax | 278 | (27) | 218 |
Changes in net unrecognized pension and other postretirement benefit costs (credits), tax | (98) | 9 | (75) |
Net pension and other postretirement benefit costs (credits), net of tax | (68) | 28 | (88) |
Net pension and other postretirement benefit costs (credits), tax | 24 | (15) | $ 32 |
Current Assets Held for Sale | Held for Sale |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Accrued unbilled revenue |  | 284 |  |
Virginia Electric and Power Company |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Accrued unbilled revenue | $ 611 | $ 550 |  |
Stonepeak | OSWP |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners | 50.00% |  |  |

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