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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 177 | $ 697
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 99 | 250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 78 | 417
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 75 | 240
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 25 | 27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 50 | 183
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 59 | 266
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 28 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 31 | 210
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 21 | 153
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 6 | 110
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 46 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 46 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
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] | 2 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 20 | 359
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 17 | 186
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 3 | 173
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 0 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 0 | 39
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 52 | 39
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 8 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 44 | 34
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] | 52 | 39
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 8 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 44 | $ 34
[1] | Excludes derivative liabilities of $4 million at Dominion Energy at September 30, 2024 and $37 million and $76 million at Virginia Power at September 30, 2024 and December 31, 2023, respectively, which are not subject to master netting or similar arrangements. Dominion Energy did not have any derivative liabilities at December 31, 2023 which were not subject to master netting or similar arrangements.

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