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Fair Value Measurements (Narrative) (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
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
Maximum |  |
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 | $ 1,000,000 |
Level 3 | Corporate Office Building |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-lived assets, estimated fair value | 35,000,000 |
Impairment of Assets and Other Charges | Corporate Office Building |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment of assets and other charges | 91,000,000 |
Asset impairment charges after tax | 68,000,000 |
Virginia Electric and Power Company |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment of assets and other charges | 7,000,000 | 4,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category | $ 0 | $ 0

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