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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, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | $ 2,176 |  | $ 613
Derivative Liabilities |  | 1,404 |  | 868
Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 882 |  | 300
Derivative Liabilities |  | 456 |  | 470
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 7,782 |  | 8,161
Total liabilities |  | 1,404 |  | 868
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 3,902 |  | 3,847
Total liabilities |  | 456 |  | 470
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 3,810 |  | 5,241
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] | 2,028 |  | 2,420
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 576 |  | 881
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] | 360 |  | 531
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments | [1] | 1,220 |  | 1,455
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] | 632 |  | 599
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 | [1] |  |  | (29)
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] |  |  | (3)
Fair Value, Measurements, Recurring | Foreign Currency Exchange Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  |  |  | 8
Derivative Liabilities |  | 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] |  |  |  |
Derivatives Assets |  |  |  | 8
Derivative Liabilities |  | 101 |  |
Fair Value, Measurements, Recurring | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 769 |  | 282
Derivative Liabilities |  | 926 |  | 469
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 |  | 268 |  | 146
Derivative Liabilities |  | 348 |  | 133
Fair Value, Measurements, Recurring | Interest rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 1,407 |  | 323
Derivative Liabilities |  | 377 |  | 399
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 |  | 614 |  | 146
Derivative Liabilities |  | 7 |  | 337
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 3,971 |  | 5,411
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 |  | 2,118 |  | 2,510
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] | 3,810 |  | 5,241
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] | 2,028 |  | 2,420
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] | 161 |  | 199
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 |  | 93
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 | [1] |  |  | (29)
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] |  |  | (3)
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 3,374 |  | 2,520
Total liabilities |  | 1,389 |  | 860
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 |  | 1,548 |  | 1,227
Total liabilities |  | 441 |  | 462
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] | 576 |  | 881
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] | 360 |  | 531
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] | 1,059 |  | 1,256
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] | 542 |  | 506
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  |  |  | 8
Derivative Liabilities |  | 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] |  |  |  |
Derivatives Assets |  |  |  | 8
Derivative Liabilities |  | 101 |  |
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 332 |  | 52
Derivative Liabilities |  | 911 |  | 461
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 |  | 32 |  | 36
Derivative Liabilities |  | 333 |  | 125
Fair Value, Measurements, Recurring | Level 2 | Interest rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 1,407 |  | 323
Derivative Liabilities |  | 377 |  | 399
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 |  | 614 |  | 146
Derivative Liabilities |  | 7 |  | 337
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 437 | [2] | 230
Total liabilities |  | 15 | [2] | 8
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 |  | 236 | [2] | 110
Total liabilities |  | 15 | [2] | 8
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives Assets |  | 437 |  | 230
Derivative Liabilities |  | 15 |  | 8
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 |  | 236 |  | 110
Derivative Liabilities |  | $ 15 |  | $ 8
[1] | Includes investments held in the nuclear decommissioning trusts and rabbi trusts. Excludes $404 million and $366 million of assets at Dominion Energy, inclusive of $161 million and $185 million at Virginia Power, at December 31, 2022 and 2021, 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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