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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 1,046 | $ 1,975
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 353 | 435
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 693 | 1,540
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 232 | 852
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 81 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 151 | 807
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 238 | 408
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 91 | 28
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 147 | 380
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 128 | 238
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 57 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 71 | 231
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 59 | 160
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 59 | 159
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 1
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 13 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 748 | 1,407
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 202 | 248
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 546 | 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] | 90 | 614
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 10 | 38
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 80 | $ 576
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 1 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 |
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] | 1 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |
Net Amounts |  | $ 0 |
[1] | Excludes derivative assets of $151 million and $201 million at Dominion Energy and $1 million and $30 million at Virginia Power at March 31, 2023 and December 31, 2022, respectively, which are not subject to master netting or other similar arrangements.

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