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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | $ 231 | $ 1,137
Derivative Asset, Noncurrent |  | 1,415 | 1,039
Derivatives Assets |  | 1,646 | 2,176
Derivative Liabilities, Current | [2] | 469 | 778
Derivative Liabilities, Noncurrent |  | 609 | 626
Derivative Liabilities |  | 1,078 | 1,404
Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 55 | 765
Derivative Asset, Noncurrent |  | 419 | 117
Derivatives Assets |  | 474 | 882
Derivative Liabilities, Current | [2] | 310 | 298
Derivative Liabilities, Noncurrent |  | 160 | 158
Derivative Liabilities |  | 470 | 456
Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 159 | 532
Derivative Asset, Noncurrent |  | 177 | 237
Derivative Liabilities, Current |  | 350 | 700
Derivative Liabilities, Noncurrent |  | 138 | 226
Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 46 | 264
Derivative Asset, Noncurrent |  | 30 | 4
Derivative Liabilities, Current |  | 256 | 290
Derivative Liabilities, Noncurrent |  | 52 | 58
Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 63 | 605
Derivative Asset, Noncurrent |  | 1,238 | 802
Derivative Liabilities, Current |  | 65 | 70
Derivative Liabilities, Noncurrent |  | 363 | 307
Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 501
Derivative Asset, Noncurrent |  | 389 | 113
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 7
Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 |
Derivative Liabilities, Current |  | 54 | 8
Derivative Liabilities, Noncurrent |  | 108 | 93
Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 |
Derivative Liabilities, Current |  | 54 | 8
Derivative Liabilities, Noncurrent |  | 108 | 93
Designated as Hedging Instrument |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 0 | 501
Derivative Asset, Noncurrent |  | 389 | 113
Derivatives Assets |  | 389 | 614
Derivative Liabilities, Current | [2] | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 7
Derivative Liabilities |  | 0 | 7
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 0 | 501
Derivative Asset, Noncurrent |  | 389 | 113
Derivatives Assets |  | 389 | 614
Derivative Liabilities, Current | [2] | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 7
Derivative Liabilities |  | 0 | 7
Designated as Hedging Instrument | Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 0
Designated as Hedging Instrument | Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 0
Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 501
Derivative Asset, Noncurrent |  | 389 | 113
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 7
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 501
Derivative Asset, Noncurrent |  | 389 | 113
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 7
Designated as Hedging Instrument | Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 |
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 0
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 |
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 0
Fair Value - Derivatives not under Hedge Accounting |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 231 | 636
Derivative Asset, Noncurrent |  | 1,026 | 926
Derivatives Assets |  | 1,257 | 1,562
Derivative Liabilities, Current | [2] | 469 | 778
Derivative Liabilities, Noncurrent |  | 609 | 619
Derivative Liabilities |  | 1,078 | 1,397
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current | [1] | 55 | 264
Derivative Asset, Noncurrent |  | 30 | 4
Derivatives Assets |  | 85 | 268
Derivative Liabilities, Current | [2] | 310 | 298
Derivative Liabilities, Noncurrent |  | 160 | 151
Derivative Liabilities |  | 470 | 449
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 159 | 532
Derivative Asset, Noncurrent |  | 177 | 237
Derivative Liabilities, Current |  | 350 | 700
Derivative Liabilities, Noncurrent |  | 138 | 226
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 46 | 264
Derivative Asset, Noncurrent |  | 30 | 4
Derivative Liabilities, Current |  | 256 | 290
Derivative Liabilities, Noncurrent |  | 52 | 58
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 63 | 104
Derivative Asset, Noncurrent |  | 849 | 689
Derivative Liabilities, Current |  | 65 | 70
Derivative Liabilities, Noncurrent |  | 363 | 300
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 0 | 0
Derivative Asset, Noncurrent |  | 0 | 0
Derivative Liabilities, Current |  | 0 | 0
Derivative Liabilities, Noncurrent |  | 0 | 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 |
Derivative Liabilities, Current |  | 54 | 8
Derivative Liabilities, Noncurrent |  | 108 | 93
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |
Derivatives Fair Value [Line Items] |  |  |
Derivative Asset, Current |  | 9 |
Derivative Liabilities, Current |  | 54 | 8
Derivative Liabilities, Noncurrent |  | $ 108 | $ 93
[1] | Includes $10 million and $118 million recorded in current assets held for sale in Dominion Energy's Consolidated Balance Sheets at September 30, 2023 and December 31, 2022, respectively.
[2] | Includes $12 million and $6 million recorded in current liabilities held for sale in Dominion Energy's Consolidated Balance Sheets at September 30, 2023 and December 31, 2022, respectively.

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