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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 1,404 | $ 868
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 435 | 69
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 396 | 432
Net Amounts |  | 573 | 367
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 430 | 464
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 45 | 35
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 247 | 90
Net Amounts |  | 138 | 339
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 443 | 95
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 34 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 71 | 54
Net Amounts |  | 338 | 28
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 146 | 84
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 71 | 54
Net Amounts |  | 62 | 22
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 483 | 374
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 159 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 324 | 367
Net Amounts |  | 0 | 0
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 176 | 43
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 176 | 36
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 377 | 399
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 210 | 49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 11
Net Amounts |  | 166 | 339
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 7 | 337
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 7 | $ 317
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 101 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 32 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 |
Net Amounts |  | 69 |
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 101 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 32 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 |
Net Amounts |  | $ 69 |
[1] | Excludes derivative liabilities of $26 million and $6 million at Virginia Power at December 31, 2022 and 2021, respectively, which are not subject to master netting or similar arrangements. Dominion Energy did no t have any derivative liabilities at December 31, 2022 or 2021 which were not subject to master netting or similar arrangements.

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