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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Derivatives Fair Value [Line Items]    
Derivative Asset, Current [1] $ 597 $ 122
Derivative Asset, Current 596 122 [2]
Derivative Asset, Noncurrent 1,513 491 [2]
Derivative Asset 2,110 613
Derivative Liabilities, Current 984 [3] 359
Derivative Liabilities, Current 982 359 [2]
Derivative Liabilities, Noncurrent [4] 666 509
Derivative Liabilities 1,650 868
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 345 76 [5]
Derivative Asset, Noncurrent [6] 446 224
Derivative Asset 791 300
Derivative Liabilities, Current [7] 308 134 [5]
Derivative Liabilities, Noncurrent [8] 277 336
Derivative Liabilities 585 470
Commodity Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 553 103
Derivative Asset, Noncurrent 212 179
Derivative Liabilities, Current 942 304
Derivative Liabilities, Noncurrent 262 165
Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 345 74
Derivative Asset, Noncurrent 2 72
Derivative Liabilities, Current 298 92
Derivative Liabilities, Noncurrent 106 41
Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 44 18
Derivative Asset, Noncurrent 1,301 305
Derivative Liabilities, Current 32 55
Derivative Liabilities, Noncurrent 301 344
Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 1
Derivative Asset, Noncurrent 444 145
Derivative Liabilities, Current   42
Derivative Liabilities, Noncurrent 68 295
Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   1
Derivative Asset, Noncurrent   7
Derivative Liabilities, Current 10  
Derivative Liabilities, Noncurrent 103  
Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   1
Derivative Asset, Noncurrent   7
Derivative Liabilities, Current 10  
Derivative Liabilities, Noncurrent 103  
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current [1] 11 1
Derivative Asset, Noncurrent 444 145
Derivative Asset 455 146
Derivative Liabilities, Current 0 [3] 42
Derivative Liabilities, Noncurrent [4] 68 295
Derivative Liabilities 68 337
Designated as Hedging Instrument | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 1
Derivative Asset, Noncurrent [6] 444 145
Derivative Asset 444 146
Derivative Liabilities, Current 0 42
Derivative Liabilities, Noncurrent [8] 68 295
Derivative Liabilities 68 337
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 11 1
Derivative Asset, Noncurrent 444 145
Derivative Liabilities, Current 0 42
Derivative Liabilities, Noncurrent 68 295
Designated as Hedging Instrument | Interest Rate Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 0 1
Derivative Asset, Noncurrent 444 145
Derivative Liabilities, Current   42
Derivative Liabilities, Noncurrent 68 295
Designated as Hedging Instrument | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   0
Derivative Asset, Noncurrent   0
Derivative Liabilities, Current 0  
Derivative Liabilities, Noncurrent 0  
Designated as Hedging Instrument | Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   0
Derivative Asset, Noncurrent   0
Derivative Liabilities, Current 0  
Derivative Liabilities, Noncurrent 0  
Fair Value - Derivatives not under Hedge Accounting    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current [1] 586 121
Derivative Asset, Noncurrent 1,069 346
Derivative Asset 1,655 467
Derivative Liabilities, Current 984 [3] 317
Derivative Liabilities, Noncurrent [4] 598 214
Derivative Liabilities 1,582 531
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 345 75
Derivative Asset, Noncurrent [6] 2 79
Derivative Asset 347 154
Derivative Liabilities, Current 308 92
Derivative Liabilities, Noncurrent [8] 209 41
Derivative Liabilities 517 133
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 553 103
Derivative Asset, Noncurrent 212 179
Derivative Liabilities, Current 942 304
Derivative Liabilities, Noncurrent 262 165
Fair Value - Derivatives not under Hedge Accounting | Commodity Contract | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 345 74
Derivative Asset, Noncurrent 2 72
Derivative Liabilities, Current 298 92
Derivative Liabilities, Noncurrent 106 41
Fair Value - Derivatives not under Hedge Accounting | Interest Rate Contract    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current 33 17
Derivative Asset, Noncurrent 857 160
Derivative Liabilities, Current 32 13
Derivative Liabilities, Noncurrent 233 49
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
Derivative Liabilities, Noncurrent 0 0
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   1
Derivative Asset, Noncurrent   7
Derivative Liabilities, Current 10  
Derivative Liabilities, Noncurrent 103  
Fair Value - Derivatives not under Hedge Accounting | Foreign currency exchange rate | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset, Current   1
Derivative Asset, Noncurrent   $ 7
Derivative Liabilities, Current 10  
Derivative Liabilities, Noncurrent $ 103  
[1] At June 30, 2022, $1 million is recorded in current assets held for sale in Dominion Energy’s Consolidated Balance Sheets. No such amounts are classified as held for sale at December 31, 2021.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] At June 30, 2022, $2 million is recorded in current liabilities held for sale in Dominion Energy’s Consolidated Balance Sheets. No such amounts are classified as held for sale at December 31, 2021.
[4] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[5] Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[6] Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets. 
[7] See Note 19 for amounts attributable to affiliates.
[8] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.