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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | $ 91 | [1] | $ 287
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 53 |  | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  |  | 0
Net Amounts | 38 |  | 204
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 21 |  | 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 18 |  | 6
Net Amounts | 3 |  | 61
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 8 |  | 31
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 8 |  | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 0 |  | 29
Commodity | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 35 | [1] | 175
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 21 |  | 12
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  |
Net Amounts | 14 |  | 163
Commodity | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 37 | [1] | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 21 |  | 68
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 16 |  |
Commodity | Virginia Electric and Power Company | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 19 |  | 64
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 18 |  | 6
Net Amounts | 1 |  | 58
Commodity | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 0 |  | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 |  | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 0 |  | 3
Interest rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 11 | [1] | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 3 |  | 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 8 |  | 17
Interest rate | Virginia Electric and Power Company | Over-the-counter |  |  |
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 |  | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 2 |  | 3
Interest rate | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 0 |  | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 0 |  | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 0 |  | 2
Foreign currency | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 8 | [1] | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 8 |  | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | 0 |  | 24
Foreign currency | Dominion Energy Gas Holdings, LLC | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | 8 |  | 26
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments | 8 |  | 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received | 0 |  | 0
Net Amounts | $ 0 |  | $ 24
[1] | Excludes $2 million and $7 million of derivative assets at December 31, 2019 and 2018, respectively, which are not subject to master netting or similar arrangements.

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