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Related-Party Transactions (Narrative) (Detail) - USD ($) shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset |  | $ 150,000,000 |  | $ 93,000,000 |
Derivative Liabilities |  | 1,646,000,000 |  | 740,000,000 |
DCP | IRCA |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest charges related to others |  |  | $ 29,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset |  | 51,000,000 |  | 24,000,000 |
Derivative Liabilities |  | 1,015,000,000 |  | 466,000,000 |
Payable to affiliates | [1] |  |  | 107,000,000 |
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries |  | $ 0 |  | 0 |
Issuance of common stock to Dominion |  | 0 | 0 |  |
Affiliated receivables |  | $ 3,000,000 |  | 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 |  | 810,000,000 |  | 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 |  | 303,000,000 |  | 287,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset |  | 2,000,000 |  | 3,000,000 |
Derivative Liabilities |  | 20,000,000 |  | 53,000,000 |
Virginia Electric and Power Company | Principal Owner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payable to affiliates |  | 0 |  | 107,000,000 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset |  |  |  | 8,000,000 |
Derivative Liabilities |  | 207,000,000 |  | 86,000,000 |
Payable to affiliates |  | 256,000,000 |  | 260,000,000 | [2]
Affiliated receivables |  | 87,000,000 |  | 362,000,000 | [2]
Merger and integration-related costs |  | 37,000,000 | $ 46,000,000 |  |
Dominion Energy Gas Holdings, LLC | IRCA | Revolving Credit Facility |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payable to affiliates |  | 256,000,000 |  | 251,000,000 |
Dominion Energy Gas Holdings, LLC | IRCA | Maximum | Revolving Credit Facility |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest charges related to others |  | 1,000,000 | 1,000,000 |  |
Dominion Energy Gas Holdings, LLC | DCP | Revolving Credit Facility |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payable to affiliates |  |  |  | 9,000,000 |
Interest charges related to others |  | 1,000,000 | 1,000,000 |  |
Dominion Energy Gas Holdings, LLC | Commercial Paper |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payable to affiliates |  | 1,800,000,000 |  | 1,800,000,000 |
Affiliated receivables |  | 262,000,000 |  | 0 |
Interest income |  | 11,000,000 |  |  |
Dominion Energy Gas Holdings, LLC | Commercial Paper | East Ohio and DGP | IRCA |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest income |  |  | 5,000,000 |  |
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 |  | 331,000,000 |  | 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 |  | 19,000,000 |  | 17,000,000 |
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Unbilled Revenues [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts due from Dominion, noncurrent |  | 21,000,000 |  | 22,000,000 |
Dominion Energy Gas Holdings, LLC | Affiliated Entity | Commodity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset |  | 0 |  | 0 |
Derivative Liabilities |  | 0 |  | 0 |
Cove Point | Commercial Paper | Term Loan Credit Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest income |  |  | 27,000,000 |  |
East Ohio | Commercial Paper |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Affiliated receivables |  | 1,700,000,000 |  | $ 1,700,000,000 |
Interest income |  | $ 18,000,000 |  |  |
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 |  |  | 2,000,000 |  |
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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