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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 1,975 | $ 493
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 435 | 69
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1,540 | 424
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 852 | 271
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 45 | 35
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 807 | 236
Commodity Contract | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 408 | 153
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 28 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 380 | 140
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 238 | 110
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 231 | 102
Commodity Contract | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 160 | 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 159 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1 | 2
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 0 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 7
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] | 1,407 | 323
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 248 | 49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 1,159 | 274
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 614 | 146
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 38 | 20
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | $ 576 | 126
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 |  |  | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  |  | 0
Net Amounts |  |  | 8
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 |  |  | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  |  | 0
Net Amounts |  |  | $ 8
[1] | Excludes derivative assets of $201 million and $120 million at Dominion Energy, and $30 million and $29 million at Virginia Power, at December 31, 2022 and 2021, respectively, which are not subject to master netting or similar arrangements.

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