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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 278 | $ 283
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 83 | 99
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 47 | 46
Net Amounts |  | 148 | 138
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 94 | 61
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 4
Net Amounts |  | 88 | 57
Commodity | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 19 | 76
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 12 | 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  |  | 6
Net Amounts |  | 7 | 61
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 6 | 4
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 4
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  |  | 6
Net Amounts |  |  | 6
Commodity | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 115 | 120
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 68 | 80
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 47 | 40
Interest rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 142 | 85
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 8
Net Amounts |  | 141 | 77
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 88 | 57
Net Amounts |  | 88 | 57
Interest rate | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 17 |
Net Amounts |  | 17 |
Foreign currency | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 2 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 2
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 2 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | $ 2 | $ 2
[1] | Excludes $1 million of derivative liabilities at December 31, 2018 and 2017, which are not subject to master netting or similar arrangements.
[2] | Excludes $9 million and $5 million of derivative liabilities at December 31, 2018 and 2017, respectively, which are not subject to master netting or similar arrangements.

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