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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 |  | 19 | 19 | [1]
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 |  | 26 | 115 | [1]
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 |  | 323 | 142 | [1]
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 | 2 | [1]
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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