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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 505 | $ 697
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 301 | 250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 20 | 30
Net Amounts |  | 184 | 417
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 208 | 240
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 45 | 27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 163 | 183
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 42 | 266
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 20 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 22 | 210
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 15 | 153
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 14 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 30
Net Amounts |  | 1 | 110
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 74 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 54 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 20 | 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] | 1 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 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] | 197 | 359
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 197 | 186
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 0 | 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 Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 192 | 39
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 30 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 162 | 34
Foreign Currency Exchange Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 192 | 39
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 30 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 162 | $ 34
[1] | Excludes derivative liabilities of $7 million at Dominion Energy at December 31, 2024, which are not subject to master netting or similar arrangements. Dominion Energy did no t have any derivative liabilities at December 31, 2023 which were not subject to master netting or similar arrangements. Excludes derivative liabilities of $17 million and $76 million at Virginia Power at December 31, 2024 and 2023, respectively, which are not subject to master netting or similar arrangements.

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