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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Derivatives Fair Value [Line Items]    
Derivative Asset, Current $ 260 $ 1,137 [1]
Derivative Asset, Noncurrent [2] 995 1,039
Derivatives Assets 1,255 2,176
Derivative Liabilities, Current 332 778 [1]
Derivative Liabilities, Noncurrent [3] 462 626
Derivative Liabilities 794 1,404
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current [4] 61 765 [5]
Derivative Asset, Noncurrent [2] 163 117
Derivatives Assets 224 882
Derivative Liabilities, Current [4] 126 298 [5]
Derivative Liabilities, Noncurrent [3] 112 158
Derivative Liabilities 238 456
Commodity Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 129 532
Derivative Asset, Noncurrent 222 237
Derivative Liabilities, Current 240 700
Derivative Liabilities, Noncurrent 114 226
Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 43 264
Derivative Asset, Noncurrent 46 4
Derivative Liabilities, Current 117 290
Derivative Liabilities, Noncurrent 51 58
Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 131 605
Derivative Asset, Noncurrent 773 802
Derivative Liabilities, Current 83 70
Derivative Liabilities, Noncurrent 298 307
Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 18 501
Derivative Asset, Noncurrent 117 113
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 11 7
Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 9 8
Derivative Liabilities, Noncurrent 50 93
Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 9 8
Derivative Liabilities, Noncurrent 50 93
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 18 501
Derivative Asset, Noncurrent [2] 117 113
Derivatives Assets 135 614
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent [3] 11 7
Derivative Liabilities 11 7
Designated as Hedging Instrument | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 18 501
Derivative Asset, Noncurrent [2] 117 113
Derivatives Assets 135 614
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent [3] 11 7
Derivative Liabilities 11 7
Designated as Hedging Instrument | Commodity Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 0
Derivative Asset, Noncurrent 0 0
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 0 0
Designated as Hedging Instrument | Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 0
Derivative Asset, Noncurrent 0 0
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 0 0
Designated as Hedging Instrument | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 18 501
Derivative Asset, Noncurrent 117 113
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 11 7
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 18 501
Derivative Asset, Noncurrent 117 113
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 11 7
Designated as Hedging Instrument | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 0 0
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 0 0
Fair Value - Derivatives not under Hedge Accounting    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 242 636
Derivative Asset, Noncurrent [2] 878 926
Derivatives Assets 1,120 1,562
Derivative Liabilities, Current 332 778
Derivative Liabilities, Noncurrent [3] 451 619
Derivative Liabilities 783 1,397
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 43 264
Derivative Asset, Noncurrent [2] 46 4
Derivatives Assets 89 268
Derivative Liabilities, Current 126 298
Derivative Liabilities, Noncurrent [3] 101 151
Derivative Liabilities 227 449
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 129 532
Derivative Asset, Noncurrent 222 237
Derivative Liabilities, Current 240 700
Derivative Liabilities, Noncurrent 114 226
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 43 264
Derivative Asset, Noncurrent 46 4
Derivative Liabilities, Current 117 290
Derivative Liabilities, Noncurrent 51 58
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 113 104
Derivative Asset, Noncurrent 656 689
Derivative Liabilities, Current 83 70
Derivative Liabilities, Noncurrent 287 300
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 0
Derivative Asset, Noncurrent 0 0
Derivative Liabilities, Current 0 0
Derivative Liabilities, Noncurrent 0 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 9 8
Derivative Liabilities, Noncurrent 50 93
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities, Current 9 8
Derivative Liabilities, Noncurrent $ 50 $ 93
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Noncurrent derivative assets are presented in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.
[3] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.
[4] See Note 19 for amounts attributable to affiliates.
[5] Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.