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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, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | $ 2,110 | $ 613
Derivative Liabilities |  | 1,650 | 868
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 791 | 300
Derivative Liabilities |  | 585 | 470
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 7,674 | 8,161
Total Liabilities |  | 1,650 | 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 |  | 3,775 | 3,847
Total Liabilities |  | 585 | 470
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 3,704 | 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] | 1,977 | 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] | 618 | 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] | 419 | 531
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,242 | 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] | 588 | 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 Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 113 | 8
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 Asset |  |  | 8
Derivative Liabilities |  | 113 |
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 765 | 282
Derivative Liabilities |  | 1,204 | 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 |  | 347 | 146
Derivative Liabilities |  | 404 | 133
Fair Value, Measurements, Recurring | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 1,345 | 323
Derivative Liabilities |  | 333 | 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 |  | 444 | 146
Derivative Liabilities |  | 68 | 337
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 3,867 | 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 |  | 2,068 | 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] | 3,704 | 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] | 1,977 | 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] | 163 | 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] | 91 | 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 |  | 3,305 | 2,520
Total Liabilities |  | 1,628 | 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 |  | 1,440 | 1,227
Total Liabilities |  | 563 | 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] | 618 | 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] | 419 | 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] | 1,079 | 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] | 497 | 506
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Exchange Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 113 | 8
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 Asset |  |  | 8
Derivative Liabilities |  | 113 |
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 263 | 52
Derivative Liabilities |  | 1,182 | 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 |  | 80 | 36
Derivative Liabilities |  | 382 | 125
Fair Value, Measurements, Recurring | Level 2 | Interest Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 1,345 | 323
Derivative Liabilities |  | 333 | 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 |  | 444 | 146
Derivative Liabilities |  | 68 | 337
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 502 | 230
Total Liabilities |  | 22 | 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 |  | 267 | 110
Total Liabilities |  | 22 | 8
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 502 | 230
Derivative Liabilities |  | 22 | 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 |  | 267 | 110
Derivative Liabilities |  | $ 22 | $ 8
[1] | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $257 million and $366 million of assets at June 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 $173 million and $185 million of assets at June 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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