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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | $ 279 |  | $ 272 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 279 |  | 272 |
Total derivatives, not subject to a master netting or similar arrangement |  | 2 |  | 7 |
Gross Amounts of Recognized Assets, Total |  | 281 |  | 279 |
Derivative Asset |  | 281 | [1] | 279 | [2]
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 66 |  | 67 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 213 |  | 205 |
Virginia Electric and Power Company |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 154 |  | 153 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 154 |  | 153 |
Total derivatives, not subject to a master netting or similar arrangement |  | 13 |  | 41 |
Gross Amounts of Recognized Assets, Total |  | 167 |  | 194 |
Derivative Asset | [2] | 167 |  | 194 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 |  | 2 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 154 |  | 151 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 17 |  |  |
Total derivatives, not subject to a master netting or similar arrangement |  | 17 |  | 0 |
Derivative Asset |  | 17 |  |  |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 |  |  |
Net Amounts |  | 12 |  |  |
Commodity | Over-the-counter |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 200 |  | 211 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 200 |  | 211 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 8 |  | 14 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 192 |  | 197 |
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 154 |  | 147 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 154 |  | 147 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 |  | 2 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 154 |  | 145 |
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 2 |  |  |
Net Amounts |  | 2 |  |  |
Commodity | Exchange |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 50 |  | 44 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 50 |  | 44 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 42 |  | 44 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 8 |  | 0 |
Interest rate | Over-the-counter |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 14 |  | 17 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 14 |  | 17 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 11 |  | 9 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 3 |  | 8 |
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 0 |  | 6 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 0 |  | 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 Received |  | 0 |  | 0 |
Net Amounts |  | 0 |  | 6 |
Foreign currency | Over-the-counter |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Gross Amounts of Recognized Assets |  | 15 |  | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet |  | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 15 |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 |  | 0 |
Net Amounts |  | 10 |  | $ 0 |
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Offsetting Assets [Line Items] |  |  |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet |  | 15 |  |  |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 |  |  |
Net Amounts |  | $ 10 |  |  |
[1] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[2] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.

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