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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 147 $ 153
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 147 153
Total derivatives, not subject to a master netting or similar arrangement 3 2
Gross Amounts of Recognized Liabilities, Total 150 155
Derivative Liabilities 150 155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 59 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 21 27
Net Amounts 67 59
Commodity | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 21 23
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 21 23
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 2 0
Net Amounts 13 9
Commodity | Exchange    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 61 71
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 61 71
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 42 44
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 19 27
Net Amounts 0 0
Interest rate | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 59 53
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 59 53
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 11 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 0 0
Net Amounts 48 44
Foreign currency | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 6 6
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 6 6
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 6 6
Virginia Electric and Power Company    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 30 23
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 30 23
Total derivatives, not subject to a master netting or similar arrangement 3 8
Gross Amounts of Recognized Liabilities, Total 33 31
Derivative Liabilities 33 31
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 2 0
Net Amounts 27 21
Virginia Electric and Power Company | Commodity | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 8 2
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 8 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral 2 0
Net Amounts 5 0
Virginia Electric and Power Company | Interest rate | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 22 21
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 22 21
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 22 21
Dominion Gas Holdings, LLC    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 7 11
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 7 11
Derivative Liabilities 7 11
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 7 11
Dominion Gas Holdings, LLC | Commodity | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 1 5
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 1 5
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 1 5
Dominion Gas Holdings, LLC | Foreign currency | Over-the-counter    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 6 6
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet 6 6
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 $ 6 $ 6