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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | $ 1,350 |  | $ 2,176
Derivative Liabilities |  | 697 |  | 1,404
Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 298 |  | 882
Derivative Liabilities |  | 316 |  | 456
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 7,865 |  | 7,782
Total liabilities |  | 697 |  | 1,404
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 3,770 |  | 3,902
Total liabilities |  | 316 |  | 456
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 4,527 |  | 3,810
Fair Value, Measurements, Recurring | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 2,362 |  | 2,028
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 500 |  | 576
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 274 |  | 360
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 1,457 |  | 1,220
Fair Value, Measurements, Recurring | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 816 |  | 632
Fair Value, Measurements, Recurring | Cash equivalents and other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 31 |  |
Fair Value, Measurements, Recurring | Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 20 |  |
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Liabilities |  | 39 |  | 101
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Liabilities |  | 39 |  | 101
Fair Value, Measurements, Recurring | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 550 |  | 769
Derivative Liabilities |  | 299 |  | 926
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 117 |  | 268
Derivative Liabilities |  | 232 |  | 348
Fair Value, Measurements, Recurring | Interest Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 800 |  | 1,407
Derivative Liabilities |  | 359 |  | 377
Fair Value, Measurements, Recurring | Interest Rate | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 181 |  | 614
Derivative Liabilities |  | 45 |  | 7
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 4,777 |  | 3,971
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 2,511 |  | 2,118
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 4,527 |  | 3,810
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 2,362 |  | 2,028
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 219 |  | 161
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 129 |  | 90
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 31 |  |
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 20 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 2,863 |  | 3,374
Total liabilities |  | 558 |  | 1,389
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 1,238 |  | 1,548
Total liabilities |  | 179 |  | 441
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 500 |  | 576
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 274 |  | 360
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 1,238 |  | 1,059
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 687 |  | 542
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Liabilities |  | 39 |  | 101
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Liabilities |  | 39 |  | 101
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 325 |  | 332
Derivative Liabilities |  | 160 |  | 911
Fair Value, Measurements, Recurring | Level 2 | Commodity | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 96 |  | 32
Derivative Liabilities |  | 95 |  | 333
Fair Value, Measurements, Recurring | Level 2 | Interest Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 800 |  | 1,407
Derivative Liabilities |  | 359 |  | 377
Fair Value, Measurements, Recurring | Level 2 | Interest Rate | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 181 |  | 614
Derivative Liabilities |  | 45 |  | 7
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 225 | [2] | 437
Total liabilities |  | 139 | [2] | 15
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 21 | [2] | 236
Total liabilities |  | 137 | [2] | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 225 |  | 437
Derivative Liabilities |  | 139 |  | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 21 |  | 236
Derivative Liabilities |  | $ 137 |  | $ 15
[1] | Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $457 million and $404 million of assets at Dominion Energy, inclusive of $217 million and $161 million at Virginia Power, at December 31, 2023 and 2022, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
[2] | Represents market prices beyond defined terms for Levels 1 and 2.

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