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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 263 | $ 505
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 93 | 301
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 52 | 20
Net Amounts |  | 118 | 184
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 80 | 208
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 24 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 0
Net Amounts |  | 55 | 163
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 24 | 42
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 9 | 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 15 | 22
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 14 | 15
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 7 | 1
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 115 | 74
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 63 | 54
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 52 | 20
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 | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 0
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 114 | 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 14 | 197
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 100 | 0
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 55 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 10 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 45 | 0
Foreign Currency Exchange Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 10 | 192
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 3 | 162
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] | 10 | 192
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 30
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 3 | $ 162
[1] | Excludes derivative liabilities of $4 million and $7 million at Dominion Energy and $10 million and $17 million at Virginia Power at September 30, 2025 and December 31, 2024, respectively, which are not subject to master netting or similar arrangements.

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