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Fair Value Measurements (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | $ 2,063,000,000 | $ 195,000,000 | $ 2,105,000,000
Unrealized gains or losses included in earnings in Level 3 fair value category |  |  | 0 | 0 | 0
Virginia Electric and Power Company |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized gains or losses included in earnings in Level 3 fair value category |  |  | $ 0 | 0 | 0
Corporate Office Building | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  | 26,000,000 |
Nonregulated Retail Software Development | Level 2 | Maximum | Virginia Electric and Power Company |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-lived assets, estimated fair value |  |  |  | 1,000,000 |
Impairment of Assets and Other Charges | Virginia Electric and Power Company |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of assets and other charges | $ 751,000,000 | $ 76,000,000 |  |  | 127,000,000
Asset impairment charges after tax | $ 559,000,000 | $ 56,000,000 |  |  | $ 94,000,000
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 |  |  |  | 16,000,000 |
Asset impairment charges after tax |  |  |  | 12,000,000 |
Impairment of Assets and Other Charges | Nonregulated Retail Software Development | Virginia Electric and Power Company |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  |  | 20,000,000 |
Asset impairment charges after tax |  |  |  | $ 15,000,000 |

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