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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 697 | $ 1,404
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 250 | 435
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 30 | 396
Net Amounts |  | 417 | 573
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 240 | 430
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 27 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 30 | 247
Net Amounts |  | 183 | 138
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 266 | 443
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 26 | 34
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 30 | 71
Net Amounts |  | 210 | 338
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 153 | 146
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 30 | 71
Net Amounts |  | 110 | 62
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 33 | 483
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 33 | 159
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 324
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] | 3 | 176
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 176
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 39 | 377
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 210
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 1
Net Amounts |  | 34 | 166
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 39 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 34 | 7
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 359 | 101
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 186 | 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 173 | 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] | 45 | 101
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 39 | $ 69
[1] | Excludes derivative liabilities of $76 million and $26 million at Virginia Power at December 31, 2023 and 2022, respectively, which are not subject to master netting or similar arrangements. Dominion Energy did no t have any derivative liabilities at December 31, 2023 or 2022 which were not subject to master netting or similar arrangements.

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