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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 1,078 | $ 1,404
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 437 | 435
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 96 | 396
Net Amounts |  | 545 | 573
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 415 | 430
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 103 | 45
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 14 | 247
Net Amounts |  | 298 | 138
Commodity Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 347 | 443
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 60 | 34
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 71
Net Amounts |  | 287 | 338
Commodity Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 236 | 146
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 37 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 71
Net Amounts |  | 199 | 62
Commodity Contract | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 141 | 483
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 46 | 159
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 95 | 324
Net Amounts |  | 0 | 0
Commodity Contract | Exchange | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 17 | 176
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 14 | 176
Net Amounts |  | 0 | 0
Interest Rate Contract | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 428 | 377
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 268 | 210
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 1
Net Amounts |  | 159 | 166
Interest Rate Contract | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 0 | 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 0 | 7
Foreign currency exchange rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 162 | 101
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 63 | 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 99 | 69
Foreign currency exchange rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 162 | 101
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 63 | 32
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 99 | $ 69
[1] | Excludes derivative liabilities of $55 million and $26 million at Virginia Power at September 30, 2023 and December 31, 2022, respectively, which are not subject to master netting or similar arrangements. Dominion Energy did no t have any derivative liabilities at September 30, 2023 and December 31, 2022 which were not subject to master netting or similar arrangements.

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