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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 118 | $ 283
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 118 | 283
Total derivatives, not subject to a master netting or similar arrangement |  | 1
Gross Amounts of Recognized Liabilities, Total | 118 | 284
Derivative Liabilities | 118 | 284
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 42 | 99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 11 | 46
Net Amounts | 65 | 138
Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 9 | 61
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 9 | 61
Total derivatives, not subject to a master netting or similar arrangement | 5 | 5
Gross Amounts of Recognized Liabilities, Total | 14 | 66
Derivative Liabilities | 14 | 66
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 6 | 4
Net Amounts | 3 | 57
Dominion Energy Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 16 | 8
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 16 | 8
Derivative Liabilities | 16 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 6 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 10 | 6
Commodity contracts | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 23 | 76
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 23 | 76
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 7 | 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 6
Net Amounts | 16 | 61
Commodity contracts | Exchange |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 32 | 120
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 32 | 120
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 21 | 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 11 | 40
Commodity contracts | Virginia Electric and Power Company | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 3 | 4
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 3 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 3 | 4
Commodity contracts | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 7 | 6
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 7 | 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 | 7 | 6
Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 58 | 85
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 58 | 85
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 9 | 8
Net Amounts | 49 | 77
Interest rate | Virginia Electric and Power Company | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 6 | 57
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 6 | 57
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 3 |
Net Amounts | 3 | 57
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 4 | 0
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 4 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 1 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 3 | 0
Foreign currency | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 5 | 2
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 5 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 5 | 2
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 5 | 2
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 5 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 5 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | $ 0 | $ 0

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