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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 931 | $ 278
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 51 | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 50 | 47
Net Amounts |  | 830 | 148
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 537 | 94
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 6
Net Amounts |  | 522 | 88
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 117 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 2
Net Amounts |  | 114 | 17
Commodity | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 43 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 18 | 12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 |
Net Amounts |  | 24 | 7
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 16 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 6
Net Amounts |  | 1 |
Commodity | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 34 | 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 |  | 8 | 47
Interest rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 850 | 142
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 4 | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 41 |
Net Amounts |  | 805 | 141
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 521 | 88
Net Amounts |  | 521 | 88
Interest rate | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 113 | 17
Net Amounts |  | 113 | 17
Foreign currency | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 4 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 2
Net Amounts |  | 1 |
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 4 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | $ 2
Net Amounts |  | $ 1 |
[1] | Excludes $3 million and $1 million of derivative liabilities at September 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $17 million and $9 million of derivative liabilities at September 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.

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