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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 1,207 | $ 1,975
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 250 | 435
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 15 | 0
Net Amounts |  | 942 | 1,540
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 297 | 852
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 27 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 270 | 807
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 289 | 408
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 26 | 28
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 263 | 380
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 112 | 238
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 99 | 231
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 118 | 160
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 33 | 159
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 15 | 0
Net Amounts |  | 70 | 1
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 4 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 800 | 1,407
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 191 | 248
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 609 | 1,159
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 181 | 614
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 11 | 38
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | $ 170 | $ 576
[1] | Excludes derivative assets of $143 million and $201 million at Dominion Energy, and $1 million and $30 million at Virginia Power, at December 31, 2023 and 2022, respectively, which are not subject to master netting or similar arrangements.

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