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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 89 | $ 287
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 51 | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 38 | 204
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 17 | 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 2 | 61
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet |  | 5 | 29
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 2 | 27
Commodity | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 39 | 175
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 18 | 12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 21 | 163
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 17 | 64
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 15 | 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 2 | 58
Commodity | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet |  | 2 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 2 | 3
Commodity | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 37 | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 26 | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 11 | 0
Interest rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 10 | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 4 | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 6 | 17
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 0 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 3
Foreign currency | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 3 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 24
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet |  | 3 | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | $ 0 | $ 24
[1] | Excludes $4 million and $7 million of derivative assets at September 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $3 million and $26 million of derivative assets at September 30, 2019 and December 31, 2018, respectively, which are not subject to master netting or similar arrangements.

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