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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 1,241 | $ 1,207
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 430 | 250
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 811 | 942
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 275 | 297
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 48 | 27
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 227 | 270
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 229 | 289
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 51 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 178 | 263
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 96 | 112
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 39 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 57 | 99
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 114 | 118
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 65 | 33
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 15
Net Amounts |  | 49 | 70
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 4 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 4 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 1
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 895 | 800
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 311 | 191
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 584 | 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] | 172 | 181
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 170 | $ 170
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 3 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 |
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] | 3 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | $ 0 |
[1] | Excludes derivative assets of $203 million and $143 million at Dominion Energy and $4 million and $1 million at Virginia Power at March 31, 2024 and December 31, 2023, respectively, which are not subject to master netting or other similar arrangements.

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