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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current | [1] | $ 597 |  | $ 122 |
Derivative Asset, Current |  | 596 |  | 122 | [2]
Derivative Asset, Noncurrent |  | 1,513 |  | 491 | [2]
Derivative Asset |  | 2,110 |  | 613 |
Derivative Liabilities, Current |  | 984 | [3] | 359 |
Derivative Liabilities, Current |  | 982 |  | 359 | [2]
Derivative Liabilities, Noncurrent | [4] | 666 |  | 509 |
Derivative Liabilities |  | 1,650 |  | 868 |
Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 345 |  | 76 | [5]
Derivative Asset, Noncurrent | [6] | 446 |  | 224 |
Derivative Asset |  | 791 |  | 300 |
Derivative Liabilities, Current | [7] | 308 |  | 134 | [5]
Derivative Liabilities, Noncurrent | [8] | 277 |  | 336 |
Derivative Liabilities |  | 585 |  | 470 |
Commodity Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 553 |  | 103 |
Derivative Asset, Noncurrent |  | 212 |  | 179 |
Derivative Liabilities, Current |  | 942 |  | 304 |
Derivative Liabilities, Noncurrent |  | 262 |  | 165 |
Commodity Contract | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 345 |  | 74 |
Derivative Asset, Noncurrent |  | 2 |  | 72 |
Derivative Liabilities, Current |  | 298 |  | 92 |
Derivative Liabilities, Noncurrent |  | 106 |  | 41 |
Interest Rate Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 44 |  | 18 |
Derivative Asset, Noncurrent |  | 1,301 |  | 305 |
Derivative Liabilities, Current |  | 32 |  | 55 |
Derivative Liabilities, Noncurrent |  | 301 |  | 344 |
Interest Rate Contract | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 0 |  | 1 |
Derivative Asset, Noncurrent |  | 444 |  | 145 |
Derivative Liabilities, Current |  |  |  | 42 |
Derivative Liabilities, Noncurrent |  | 68 |  | 295 |
Foreign currency exchange rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 1 |
Derivative Asset, Noncurrent |  |  |  | 7 |
Derivative Liabilities, Current |  | 10 |  |  |
Derivative Liabilities, Noncurrent |  | 103 |  |  |
Foreign currency exchange rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 1 |
Derivative Asset, Noncurrent |  |  |  | 7 |
Derivative Liabilities, Current |  | 10 |  |  |
Derivative Liabilities, Noncurrent |  | 103 |  |  |
Designated as Hedging Instrument |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current | [1] | 11 |  | 1 |
Derivative Asset, Noncurrent |  | 444 |  | 145 |
Derivative Asset |  | 455 |  | 146 |
Derivative Liabilities, Current |  | 0 | [3] | 42 |
Derivative Liabilities, Noncurrent | [4] | 68 |  | 295 |
Derivative Liabilities |  | 68 |  | 337 |
Designated as Hedging Instrument | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 0 |  | 1 |
Derivative Asset, Noncurrent | [6] | 444 |  | 145 |
Derivative Asset |  | 444 |  | 146 |
Derivative Liabilities, Current |  | 0 |  | 42 |
Derivative Liabilities, Noncurrent | [8] | 68 |  | 295 |
Derivative Liabilities |  | 68 |  | 337 |
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 |  | 11 |  | 1 |
Derivative Asset, Noncurrent |  | 444 |  | 145 |
Derivative Liabilities, Current |  | 0 |  | 42 |
Derivative Liabilities, Noncurrent |  | 68 |  | 295 |
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 0 |  | 1 |
Derivative Asset, Noncurrent |  | 444 |  | 145 |
Derivative Liabilities, Current |  |  |  | 42 |
Derivative Liabilities, Noncurrent |  | 68 |  | 295 |
Designated as Hedging Instrument | Foreign currency exchange rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 0 |
Derivative Asset, Noncurrent |  |  |  | 0 |
Derivative Liabilities, Current |  | 0 |  |  |
Derivative Liabilities, Noncurrent |  | 0 |  |  |
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 0 |
Derivative Asset, Noncurrent |  |  |  | 0 |
Derivative Liabilities, Current |  | 0 |  |  |
Derivative Liabilities, Noncurrent |  | 0 |  |  |
Fair Value - Derivatives not under Hedge Accounting |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current | [1] | 586 |  | 121 |
Derivative Asset, Noncurrent |  | 1,069 |  | 346 |
Derivative Asset |  | 1,655 |  | 467 |
Derivative Liabilities, Current |  | 984 | [3] | 317 |
Derivative Liabilities, Noncurrent | [4] | 598 |  | 214 |
Derivative Liabilities |  | 1,582 |  | 531 |
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 345 |  | 75 |
Derivative Asset, Noncurrent | [6] | 2 |  | 79 |
Derivative Asset |  | 347 |  | 154 |
Derivative Liabilities, Current |  | 308 |  | 92 |
Derivative Liabilities, Noncurrent | [8] | 209 |  | 41 |
Derivative Liabilities |  | 517 |  | 133 |
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 553 |  | 103 |
Derivative Asset, Noncurrent |  | 212 |  | 179 |
Derivative Liabilities, Current |  | 942 |  | 304 |
Derivative Liabilities, Noncurrent |  | 262 |  | 165 |
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 345 |  | 74 |
Derivative Asset, Noncurrent |  | 2 |  | 72 |
Derivative Liabilities, Current |  | 298 |  | 92 |
Derivative Liabilities, Noncurrent |  | 106 |  | 41 |
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  | 33 |  | 17 |
Derivative Asset, Noncurrent |  | 857 |  | 160 |
Derivative Liabilities, Current |  | 32 |  | 13 |
Derivative Liabilities, Noncurrent |  | 233 |  | 49 |
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 |
Derivative Liabilities, Noncurrent |  | 0 |  | 0 |
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 1 |
Derivative Asset, Noncurrent |  |  |  | 7 |
Derivative Liabilities, Current |  | 10 |  |  |
Derivative Liabilities, Noncurrent |  | 103 |  |  |
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Current |  |  |  | 1 |
Derivative Asset, Noncurrent |  |  |  | $ 7 |
Derivative Liabilities, Current |  | 10 |  |  |
Derivative Liabilities, Noncurrent |  | $ 103 |  |  |
[1] | At June 30, 2022, $1 million is recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets. No such amounts are classified as held for sale at December 31, 2021.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | At June 30, 2022, $2 million is recorded in current liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets. No such amounts are classified as held for sale at December 31, 2021.
[4] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[5] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[6] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[7] | See Note 19 for amounts attributable to affiliates.
[8] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

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