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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 999 | $ 1,207
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 99 | 250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 900 | 942
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 188 | 297
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 25 | 27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 163 | 270
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 185 | 289
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 28 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 157 | 263
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 132 | 112
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 117 | 99
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 104 | 118
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 46 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 58 | 70
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 3 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1 | 1
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 702 | 800
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 17 | 191
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 685 | 609
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 45 | 181
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 45 | $ 170
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 8 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 8 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | 0 |
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 8 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 8 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | $ 0 |
[1] | Excludes derivative assets of $161 million and $143 million at Dominion Energy and $11 million and $1 million at Virginia Power at September 30, 2024 and December 31, 2023, respectively, which are not subject to master netting or other similar arrangements.

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