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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | $ 2,469 | $ 613
Derivative Liabilities |  | 2,371 | 868
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 961 | 300
Derivative Liabilities |  | 917 | 470
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 7,772 | 8,161
Total Liabilities |  | 2,371 | 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 |  | 3,809 | 3,847
Total Liabilities |  | 917 | 470
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 3,514 | 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 | [2] | 1,870 | 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] | 563 | 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 | [2] | 372 | 531
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,226 | 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 | [2] | 606 | 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 | [2] |  | (3)
Fair Value, Measurements, Recurring | Foreign Exchange |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 6 | 8
Derivative Liabilities |  | 387 |
Fair Value, Measurements, Recurring | Foreign Exchange | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 6 | 8
Derivative Liabilities |  | 387 |
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 870 | 282
Derivative Liabilities |  | 1,509 | 469
Fair Value, Measurements, Recurring | Commodity | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 359 | 146
Derivative Liabilities |  | 503 | 133
Fair Value, Measurements, Recurring | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 1,593 | 323
Derivative Liabilities |  | 475 | 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] |  |  |
Derivative Asset |  | 596 | 146
Derivative Liabilities |  | 27 | 337
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 3,673 | 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 |  | 1,958 | 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] | 3,514 | 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 | [2] | 1,870 | 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] | 159 | 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 | [2] | 88 | 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 | [2] |  | (3)
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 3,600 | 2,520
Total Liabilities |  | 2,354 | 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 |  | 1,563 | 1,227
Total Liabilities |  | 900 | 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] | 563 | 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 | [2] | 372 | 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] | 1,067 | 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 | [2] | 518 | 506
Fair Value, Measurements, Recurring | Level 2 | Foreign Exchange |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 6 | 8
Derivative Liabilities |  | 387 |
Fair Value, Measurements, Recurring | Level 2 | Foreign Exchange | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 6 | 8
Derivative Liabilities |  | 387 |
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 371 | 52
Derivative Liabilities |  | 1,492 | 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] |  |  |
Derivative Asset |  | 71 | 36
Derivative Liabilities |  | 486 | 125
Fair Value, Measurements, Recurring | Level 2 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 1,593 | 323
Derivative Liabilities |  | 475 | 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] |  |  |
Derivative Asset |  | 596 | 146
Derivative Liabilities |  | 27 | 337
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 499 | 230
Total Liabilities |  | 17 | 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 |  | 288 | 110
Total Liabilities |  | 17 | 8
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 499 | 230
Derivative Liabilities |  | 17 | 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] |  |  |
Derivative Asset |  | 288 | 110
Derivative Liabilities |  | $ 17 | $ 8
[1] | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $238 million and $366 million of assets at September 30, 2022 and December 31, 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] | Includes investments held in the nuclear decommissioning trusts. Excludes $150 million and $185 million of assets at September 30, 2022 and December 31, 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.

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