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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | $ 1,255 | $ 2,176
Derivative Liabilities |  | 794 | 1,404
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 224 | 882
Derivative Liabilities |  | 238 | 456
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 7,489 | 7,782
Total Liabilities |  | 794 | 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 |  | 3,574 | 3,902
Total Liabilities |  | 238 | 456
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 4,354 | 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] | 2,317 | 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] | 539 | 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] | 323 | 360
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,314 | 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] | 709 | 632
Fair Value, Measurements, Recurring | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents and other |  | 27 |
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] |  |  |
Cash equivalents and other |  | 1 |
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liabilities |  | 59 | 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 |  | 59 | 101
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 351 | 769
Derivative Liabilities |  | 354 | 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 |  | 89 | 268
Derivative Liabilities |  | 168 | 348
Fair Value, Measurements, Recurring | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 904 | 1,407
Derivative Liabilities |  | 381 | 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 |  | 135 | 614
Derivative Liabilities |  | 11 | 7
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 4,552 | 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 |  | 2,409 | 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] | 4,354 | 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] | 2,317 | 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] | 170 | 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] | 90 | 90
Fair Value, Measurements, Recurring | Level 1 | Cash Equivalents and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents and other |  | 27 |
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] |  |  |
Cash equivalents and other |  | 1 |
Fair Value, Measurements, Recurring | Level 1 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 1 |
Fair Value, Measurements, Recurring | Level 1 | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 1 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 2,781 | 3,374
Total Liabilities |  | 772 | 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 |  | 1,150 | 1,548
Total Liabilities |  | 220 | 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] | 539 | 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] | 323 | 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] | 1,144 | 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] | 619 | 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 |  | 59 | 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 |  | 59 | 101
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 194 | 332
Derivative Liabilities |  | 332 | 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 |  | 73 | 32
Derivative Liabilities |  | 150 | 333
Fair Value, Measurements, Recurring | Level 2 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 904 | 1,407
Derivative Liabilities |  | 381 | 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 |  | 135 | 614
Derivative Liabilities |  | 11 | 7
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 156 | 437
Total Liabilities |  | 22 | 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 |  | 15 | 236
Total Liabilities |  | 18 | 15
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives Assets |  | 156 | 437
Derivative Liabilities |  | 22 | 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 |  | 15 | 236
Derivative Liabilities |  | $ 18 | $ 15
[1] | Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $375 million and $404 million of assets at Dominion Energy, inclusive of $152 million and $161 million at Virginia Power, at June 30, 2023 and December 31, 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.

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