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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivatives Fair Value [Line Items]    
Derivative Asset $ 93 $ 294
Derivative Liabilities 740 279
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 24 93
Derivative Liabilities 466 103
Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset 8 31
Derivative Liabilities 86 19
Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset   3
Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 83 17
Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3  
Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 68 223
Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 67 209
Current Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 1 14
Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 20  
Derivative Liabilities   63
Current Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 20 60
Current Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   10
Current Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [2]   5
Current Assets | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset   3
Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset   2
Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 25 71
Noncurrent Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 7 41
Noncurrent Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 10 4
Noncurrent Assets | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 8 26
Noncurrent Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 4  
Derivative Liabilities   30
Noncurrent Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   30
Noncurrent Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 185  
Derivative Liabilities   78
Noncurrent Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [4] 8 26
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset   26
Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 408 157
Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 83 129
Current Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 322 26
Current Liabilities | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3 2
Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 243 25
Current Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 58  
Current Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 178  
Current Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [6] 33 11
Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 30 9
Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3 2
Noncurrent Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [7] 332 122
Noncurrent Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 48 6
Noncurrent Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 284 116
Noncurrent Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 223 78
Noncurrent Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 45  
Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3  
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 [8] 8
Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 8
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Derivative Asset 50 105
Derivative Liabilities 598 166
Designated as Hedging Instrument | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 2 3
Derivative Liabilities 363 88
Designated as Hedging Instrument | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset   31
Derivative Liabilities 86 19
Designated as Hedging Instrument | Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 31 69
Designated as Hedging Instrument | Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 30 55
Designated as Hedging Instrument | Current Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 1 14
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 0  
Derivative Liabilities   3
Designated as Hedging Instrument | Current Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   10
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [2]   5
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset   3
Designated as Hedging Instrument | Current Assets | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset   2
Designated as Hedging Instrument | Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 19 36
Designated as Hedging Instrument | Noncurrent Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 1 6
Designated as Hedging Instrument | Noncurrent Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 10 4
Designated as Hedging Instrument | Noncurrent Assets | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 8 26
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   0
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 0  
Derivative Liabilities   0
Designated as Hedging Instrument | Noncurrent Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 185  
Derivative Liabilities   78
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [4] 8 26
Designated as Hedging Instrument | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset   26
Designated as Hedging Instrument | Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 330 45
Designated as Hedging Instrument | Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 6 17
Designated as Hedging Instrument | Current Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 321 26
Designated as Hedging Instrument | Current Liabilities | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3 2
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 185 10
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   15
Designated as Hedging Instrument | Current Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 178  
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [6] 33 11
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 30 9
Designated as Hedging Instrument | Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3 2
Designated as Hedging Instrument | Noncurrent Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [7] 268 121
Designated as Hedging Instrument | Noncurrent Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 1 5
Designated as Hedging Instrument | Noncurrent Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 267 116
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 178 78
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 0  
Designated as Hedging Instrument | Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 3  
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 [8] 8
Designated as Hedging Instrument | Noncurrent Liabilities | Dominion Energy Gas Holdings, LLC | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 8
Fair Value - Derivatives not under Hedge Accounting    
Derivatives Fair Value [Line Items]    
Derivative Asset 43 189
Derivative Liabilities 142 113
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 22 90
Derivative Liabilities 103 15
Fair Value - Derivatives not under Hedge Accounting | Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 37 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 37 154
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 0 0
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 20  
Derivative Liabilities   60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 20 60
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 0  
Derivative Liabilities   0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 6 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 6 35
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 0 0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 0 0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 2  
Derivative Liabilities   30
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 0  
Derivative Liabilities   0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 78 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 77 112
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 1 0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 0 0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 58 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 58 15
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 0  
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [7] 64 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 47 1
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 17 0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 45 $ 0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 45  
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities $ 0  
[1] Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[2] Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.
[3] Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[4] Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[5] Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets.
[6] Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2019. Current derivative liabilities include $2 million in other current liabilities, with the remainder recorded in current liabilities of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018.
[7] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[8] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.