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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 623 | $ 278
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 45 | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 35 | 47
Net Amounts |  | 543 | 148
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 335 | 94
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 6
Net Amounts |  | 332 | 88
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 77 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 | 2
Net Amounts |  | 64 | 17
Commodity | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 42 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 12
Net Amounts |  | 37 | 7
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
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 |  | 3 | 6
Commodity | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 24 | 115
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 24 | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  |  | 47
Interest rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 557 | 142
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 16 | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 35 |
Net Amounts |  | 506 | 141
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 332 | 88
Net Amounts |  | 332 | 88
Interest rate | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 77 | 17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 13 |
Net Amounts |  | $ 64 | 17
Foreign currency | 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 |  |  | 2
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  |  | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  |  | $ 2
[1] | Excludes $3 million and $1 million of derivative liabilities at June 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $23 million and $9 million of derivative liabilities at June 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.

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