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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | $ 215 | $ 91
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 43 | 53
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 7 | 0
Net Amounts |  | 165 | 38
Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 129 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 124 | 3
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 0
Commodity | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 136 | 35
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 9 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 127 | 14
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 129 | 19
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 5 | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 124 | 1
Commodity | Exchange |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 45 | 37
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 20 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 7 | 0
Net Amounts |  | 18 | 16
Interest rate | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 34 | 11
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 14 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 20 | 8
Foreign currency | Over-the-counter |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [1] | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | 0 | 0
Foreign currency | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet | [2] | 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 | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Assets [Line Items] |  |  |
Gross Assets Presented in the Consolidated Balance Sheet |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received |  | 0 | 0
Net Amounts |  | $ 0 | $ 0
[1] | Excludes $1 million and $2 million of derivative assets at June 30, 2020 and December 31, 2019, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $4 million and $3 million of derivative assets at June 30, 2020 and December 31, 2019, respectively, which are not subject to master netting or similar arrangements.

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