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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 369 | $ 278
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 38 | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 47
Net Amounts |  | 330 | 148
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 184 | 94
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 |
Net Amounts |  | 181 | 88
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 42 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 7 | 2
Net Amounts |  | 35 | 17
Commodity | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 19 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 |
Net Amounts |  | 13 | 7
Commodity | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 26 | 115
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 26 | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  |  | 47
Commodity | Virginia Electric and Power Company | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 3 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 2 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 |
Interest rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 323 | 142
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 | 1
Net Amounts |  | 317 | 141
Interest rate | Virginia Electric and Power Company | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 181 | 88
Net Amounts |  | 181 | 88
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 41 | 17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 6 |
Net Amounts |  | 35 | 17
Foreign currency | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 1 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 2
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 1 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | $ 1 | $ 2
[1] | Excludes $— million and $1 million of derivative liabilities at March 31, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $6 million and $9 million of derivative liabilities at March 31, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.

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