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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 90 | $ 283
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 90 | 283
Total derivatives, not subject to a master netting or similar arrangement | 0 | 1
Gross Amounts of Recognized Liabilities, Total | 90 | 284
Derivative Liabilities | 90 | 284
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 34 | 99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 46
Net Amounts | 56 | 138
Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 16 | 61
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 16 | 61
Total derivatives, not subject to a master netting or similar arrangement | 7 | 5
Gross Amounts of Recognized Liabilities, Total | 23 | 66
Derivative Liabilities | 23 | 66
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 5 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 11 | 57
Dominion Energy Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 1 | 8
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 1 | 8
Derivative Liabilities | 1 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 1 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 0 | 6
Commodity | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 12 | 76
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 12 | 76
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 5 | 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 6
Net Amounts | 7 | 61
Commodity | Over-the-counter | Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 2 | 4
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 2 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 2 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 0 | 0
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 0 | 6
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities 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 | 0 | 0
Net Amounts | 0 | 6
Commodity | Exchange |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 19 | 120
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 19 | 120
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 19 | 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 40
Net Amounts | 0 | 0
Interest rate | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 58 | 85
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
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
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 49 | 77
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 14 | 57
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 14 | 57
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 3 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral | 0 | 0
Net Amounts | 11 | 57
Foreign currency | Over-the-counter |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 1 | 2
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 1 | 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 | 0 | 0
Net Amounts | 0 | 0
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 1 | 2
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 1 | 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 | 0 | 0
Net Amounts | $ 0 | $ 0

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