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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 not have any derivative liabilities at September 30, 2023 and December 31, 2022 which were not subject to master netting or similar arrangements.