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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 1,157 | $ 1,207
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 301 | 250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 856 | 942
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 357 | 297
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 45 | 27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 312 | 270
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 197 | 289
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 20 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 177 | 263
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 95 | 112
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 14 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 81 | 99
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 55 | 118
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 54 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 1 | 70
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 2 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 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] | 875 | 800
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 197 | 191
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 678 | 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] | 230 | 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 |  | 230 | $ 170
Foreign Currency Exchange Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 30 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 30 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | 0 |
Foreign Currency Exchange Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 30 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 30 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | $ 0 |
[1] | Excludes derivative assets of $242 million and $143 million at Dominion Energy, and $18 million and $1 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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