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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives Fair Value [Line Items]    
Derivative Asset $ 307 $ 279
Derivative Liabilities 284 155
Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 166 194
Derivative Liabilities 66 31
Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Derivative Liabilities 8 11
Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 169 140
Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 163 130
Current Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 6 10
Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset [2] 75 66
Current Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 75 60
Current Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset   6
Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 138 139
Noncurrent Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 95 132
Noncurrent Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 11 7
Noncurrent Assets | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Noncurrent Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 91 128
Noncurrent Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 91 128
Noncurrent Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [4] 32  
Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 250 128
Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 195 92
Current Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 33
Current Liabilities | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 2 3
Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [6] 53 18
Current Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 9 10
Current Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 44 8
Current Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [7] 8 7
Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 6 4
Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 2 3
Noncurrent Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [8] 34 27
Noncurrent Liabilities [Member] | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 2 4
Noncurrent Liabilities [Member] | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 32 20
Noncurrent Liabilities [Member] | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   3
Noncurrent Liabilities [Member] | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [9] 13 13
Noncurrent Liabilities [Member] | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 13 13
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [10]   4
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   1
Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   3
Fair Value - Derivatives under Hedge Accounting [Member]    
Derivatives Fair Value [Line Items]    
Derivative Asset 54 46
Derivative Liabilities 191 111
Fair Value - Derivatives under Hedge Accounting [Member] | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset   6
Derivative Liabilities 57 21
Fair Value - Derivatives under Hedge Accounting [Member] | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Derivative Liabilities 8 11
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 11 39
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 5 29
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 6 10
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset [2]   6
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset   6
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 43 7
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Asset 11 7
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Asset [4] 32  
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Asset 32  
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 158 87
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 103 51
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 53 33
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 2 3
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [6] 44 8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 44 8
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [7] 8 7
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 6 4
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 2 3
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [8] 33 24
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 1 1
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 32 20
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   3
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [9] 13 13
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company | Interest rate    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 13 13
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [10]   4
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   1
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Dominion Energy Gas Holdings, LLC | Foreign currency    
Derivatives Fair Value [Line Items]    
Derivative Liabilities   3
Derivatives Not Designated as Hedging Instruments    
Derivatives Fair Value [Line Items]    
Derivative Asset 253 233
Derivative Liabilities 93 44
Derivatives Not Designated as Hedging Instruments | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 166 188
Derivative Liabilities 9 10
Derivatives Not Designated as Hedging Instruments | Current Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [1] 158 101
Derivatives Not Designated as Hedging Instruments | Current Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 158 101
Derivatives Not Designated as Hedging Instruments | Current Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset [2] 75 60
Derivatives Not Designated as Hedging Instruments | Current Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 75 60
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets    
Derivatives Fair Value [Line Items]    
Derivative Asset [3] 95 132
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 95 132
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Asset 91 128
Derivatives Not Designated as Hedging Instruments | Noncurrent Assets | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Asset 91 128
Derivatives Not Designated as Hedging Instruments | Current Liabilities    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [5] 92 41
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 92 41
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Virginia Electric and Power Company    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [6] 9 10
Derivatives Not Designated as Hedging Instruments | Current Liabilities | Virginia Electric and Power Company | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities 9 10
Derivatives Not Designated as Hedging Instruments | Noncurrent Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative Liabilities [8] 1 3
Derivatives Not Designated as Hedging Instruments | Noncurrent Liabilities [Member] | Commodity    
Derivatives Fair Value [Line Items]    
Derivative Liabilities $ 1 $ 3
[1] Current derivative assets are presented in other current assets in Dominion Energy's Consolidated Balance Sheets.
[2] Current derivative assets are presented in other current assets in Virginia Power's 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 Virginia Power's Consolidated Balance Sheets.
[7] Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.
[8] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy's Consolidated Balance Sheets.
[9] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power's Consolidated Balance Sheets.
[10] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy Gas' Consolidated Balance Sheets.