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Related-Party Transactions (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset | $ 216,000,000 |  |  | $ 216,000,000 |  | $ 93,000,000 |
Derivative Liabilities | 1,334,000,000 |  |  | 1,334,000,000 |  | 740,000,000 |
DCP | IRCA |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest charges related to others |  | $ 29,000,000 |  |  | $ 58,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset | 133,000,000 |  |  | 133,000,000 |  | 24,000,000 |
Derivative Liabilities | 1,004,000,000 |  |  | 1,004,000,000 |  | 466,000,000 |
Payable to affiliates | 340,000,000 |  |  | 340,000,000 |  | 107,000,000 | [1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries | $ 0 |  |  | $ 0 |  | 0 |
Issuance of common stock to Dominion | 0 | 0 |  | 0 | 0 |  |
Affiliated receivables | $ 2,000,000 |  |  | $ 2,000,000 |  | 27,000,000 | [1]
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent | 838,000,000 |  |  | 838,000,000 |  | 782,000,000 |
Virginia Electric and Power Company | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent | 318,000,000 |  |  | 318,000,000 |  | 287,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset | 3,000,000 |  |  | 3,000,000 |  | 3,000,000 |
Derivative Liabilities | 19,000,000 |  |  | 19,000,000 |  | 53,000,000 |
Virginia Electric and Power Company | Principal Owner |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates | 340,000,000 |  |  | 340,000,000 |  | 107,000,000 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset |  |  |  |  |  | 8,000,000 |
Derivative Liabilities | 204,000,000 |  |  | 204,000,000 |  | 86,000,000 |
Payable to affiliates | 314,000,000 |  |  | 314,000,000 |  | 260,000,000 | [2]
Affiliated receivables | 77,000,000 |  |  | 77,000,000 |  | 362,000,000 | [2]
Business combination acquisition related costs |  |  |  | 1,700,000,000 | $ 323,000,000 |  |
Dominion Energy Gas Holdings, LLC | IRCA | Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates | 314,000,000 |  |  | 314,000,000 |  | 251,000,000 |
Dominion Energy Gas Holdings, LLC | DCP | Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  |  |  |  |  | 9,000,000 |
Dominion Energy Gas Holdings, LLC | Maximum | IRCA | Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest charges related to others | 1,000,000 | $ 1,000,000 |  | 2,000,000 | 1,000,000 |  |
Dominion Energy Gas Holdings, LLC | Maximum | DCP | Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest charges related to others | 1,000,000 | 1,000,000 |  | 1,000,000 | 2,000,000 |  |
Dominion Energy Gas Holdings, LLC | Commercial Paper |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates | 2,300,000,000 |  |  | 2,300,000,000 |  | 1,800,000,000 |
Affiliated receivables | 263,000,000 |  |  | 263,000,000 |  | 0 |
Interest income | 12,000,000 |  |  | 23,000,000 |  |  |
Dominion Energy Gas Holdings, LLC | Commercial Paper | East Ohio and DGP | IRCA |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest income |  | 3,000,000 |  |  | 8,000,000 |  |
Dominion Energy Gas Holdings, LLC | Commercial Paper | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest income | 1,000,000 |  |  | 2,000,000 |  |  |
Dominion Energy Gas Holdings, LLC | Amounts Associated with the Dominion Pension Plan | Other Deferred Charges and Other Assets |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent | 334,000,000 |  |  | 334,000,000 |  | 326,000,000 |
Dominion Energy Gas Holdings, LLC | Amounts Associated with the Dominion Retiree Health and Welfare Plan | Other Deferred Charges and Other Assets |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent | 20,000,000 |  |  | 20,000,000 |  | 17,000,000 |
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Unbilled Revenues |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent | 18,000,000 |  |  | 18,000,000 |  | 22,000,000 |
Dominion Energy Gas Holdings, LLC | Affiliated Entity | Commodity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative Asset | 0 |  |  | 0 |  | 0 |
Derivative Liabilities | 0 |  |  | 0 |  | 0 |
Cove Point | Commercial Paper | Term Loan Credit Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest income |  | 27,000,000 |  |  | 54,000,000 |  |
East Ohio | Commercial Paper |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Affiliated receivables |  |  |  |  |  | $ 1,700,000,000 |
Interest income | $ 15,000,000 |  |  | $ 33,000,000 |  |  |
Dominion Energy Midstream Partners, LP | Commercial Paper | Term Loan Credit Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  |  | $ 395,000,000 |  |  |  |
Interest charges related to others |  | $ 3,000,000 |  |  | $ 6,000,000 |  |
Debt instrument, face amount |  |  | $ 400,000,000 |  |  |  |
Debt maturity year |  |  | 2022 |  |  |  |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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