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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 283 | $ 153
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 283 | 153
Total derivatives, not subject to a master netting or similar arrangement | 1 | 2
Gross Amounts of Recognized Liabilities, Total | 284 | 155
Derivative Liabilities | 284 | 155
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 99 | 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 46 | 27
Net Amounts | 138 | 59
Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 61 | 23
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 61 | 23
Total derivatives, not subject to a master netting or similar arrangement | 5 | 8
Gross Amounts of Recognized Liabilities, Total | 66 | 31
Derivative Liabilities | 66 | 31
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 4 | 2
Net Amounts | 57 | 21
Dominion Energy Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 8 | 11
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 8 | 11
Derivative Liabilities | 8 | 11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 6 | 11
Commodity | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 76 | 23
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 76 | 23
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 9 | 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 6 |
Net Amounts | 61 | 9
Commodity | Exchange |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 120 | 71
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 120 | 71
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 80 | 44
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 40 | 27
Commodity | Virginia Electric and Power Company | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 4 | 2
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 4 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 4 | 2
Commodity | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 6 | 5
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 6 | 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 | 6 | 5
Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 85 | 53
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 85 | 53
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 8 | 9
Net Amounts | 77 | 44
Interest rate | Virginia Electric and Power Company | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 57 | 21
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 57 | 21
Net Amounts | 57 | 21
Foreign currency | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 2 | 6
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 2 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 |
Net Amounts |  | 6
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 2 | 6
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 2 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | $ 0 | $ 6

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