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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized gains or losses included in operating revenue in Level 3 fair value category | $ 0 | $ (6,000,000) |  | $ 0 | $ (8,000,000)
Virginia Electric and Power Company |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized gains or losses included in operating revenue in Level 3 fair value category | $ 0 | $ 0 |  | $ 0 | $ 0
Virginia Electric and Power Company | Level 2 | Nonregulated Retail Software Development | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-lived assets, estimated fair value |  |  | $ 1,000,000 |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges | Nonregulated Retail Software Development |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of assets and other charges (benefits) |  |  | 20,000,000 |  |
Asset impairment charges after tax |  |  | $ 15,000,000 |  |

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