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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 153 | $ 335
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 153 | 335
Total derivatives, not subject to a master netting or similar arrangement | 2 | 8
Gross Amounts of Recognized Liabilities, Total | 155 | 343
Derivative liabilities | 155 | 343
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 67 | 141
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 27 | 0
Net Amounts | 59 | 194
Commodity | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 23 | 70
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 23 | 70
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 14 | 37
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 9 | 33
Commodity | Exchange |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 71 | 82
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 71 | 82
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 44 | 82
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 27 | 0
Net Amounts | 0 | 0
Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 53 | 183
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 53 | 183
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 9 | 22
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 44 | 161
Foreign currency | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 6 | 0
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 6 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 6 | 0
Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 23 | 64
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 23 | 64
Total derivatives, not subject to a master netting or similar arrangement | 8 | 22
Gross Amounts of Recognized Liabilities, Total | 31 | 86
Derivative liabilities | 31 | 86
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 | 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 21 | 51
Virginia Electric and Power Company | Commodity | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 2 | 5
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 2 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 0 | 2
Virginia Electric and Power Company | Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 21 | 59
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 21 | 59
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 10
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 21 | 49
Dominion Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 11 | 14
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 11 | 14
Derivative liabilities | 11 | 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 11 | 14
Dominion Gas Holdings, LLC | Commodity | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 5 | 0
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 5 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 5 | 0
Dominion Gas Holdings, LLC | Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 0 | 14
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 0 | 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | 0 | 14
Dominion Gas Holdings, LLC | Foreign currency | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 6 | 0
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 6 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Paid | 0 | 0
Net Amounts | $ 6 | $ 0

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