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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | $ 1,640 | $ 735
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 40 | 53
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 24 | 35
Net Amounts |  | 1,576 | 647
Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 995 | 422
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 0
Net Amounts |  | 993 | 404
Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 207 | 86
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 207 | 78
Commodity | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 27 | 105
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 3 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 0
Net Amounts |  | 23 | 84
Commodity | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 4 | 59
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 1 | 18
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 1 | 0
Net Amounts |  | 2 | 41
Commodity | Exchange |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 16 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 16 | 21
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 0 | 0
Interest rate | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 1,580 | 606
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 21 | 8
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 23 | 35
Net Amounts |  | 1,536 | 563
Interest rate | Over-the-counter | Virginia Electric and Power Company |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [2] | 991 | 363
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 991 | 363
Interest rate | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 190 | 83
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 5
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 190 | 78
Foreign currency | Over-the-counter |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet | [1] | 17 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | 17 | 0
Foreign currency | Over-the-counter | Dominion Energy Gas Holdings, LLC |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross Liabilities Presented in the Consolidated Balance Sheet |  | 17 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments |  | 0 | 3
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral |  | 0 | 0
Net Amounts |  | $ 17 | $ 0
[1] | Excludes $6 million and $5 million of derivative liabilities at March 31, 2020 and December 31, 2019, respectively, which are not subject to master netting or similar arrangements.
[2] | Excludes $20 million and $44 million of derivative liabilities at March 31, 2020 and December 31, 2019, respectively, which are not subject to master netting or similar arrangements.

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