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Related-Party Transactions (Narrative) (Detail) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Aug. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Proceeds From Debt |  |  |  |  |  | $ 2,298,000,000 | $ 4,400,000,000 |  |
Facility Limit | [1] | $ 6,000,000,000 |  | $ 6,000,000,000 |  | 6,000,000,000 |  |  |
Derivative Asset |  | 93,000,000 |  | 93,000,000 |  | 93,000,000 |  | $ 294,000,000 |
Derivative Liabilities |  | 934,000,000 |  | 934,000,000 |  | 934,000,000 |  | 279,000,000 |
Issuance of common stock to Dominion |  |  | 18.5 |  |  |  |  |  |
Dominion Cove Point L N G L P [Member] | Term Loan Due In Two Thousand Twenty One [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Repayments Of Debt |  | 3,000,000,000.0 |  |  |  | 3,000,000,000.0 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Due From Related Parties Current |  | 8,000,000 |  | 8,000,000 |  | 8,000,000 |  | 101,000,000 | [2]
Proceeds From Debt |  |  |  |  |  | 698,000,000 | $ 700,000,000 |  |
Facility Limit | [3] | 6,000,000,000 |  | 6,000,000,000 |  | 6,000,000,000 |  |  |
Derivative Asset |  | 20,000,000 |  | 20,000,000 |  | 20,000,000 |  | 93,000,000 |
Derivative Liabilities |  | 554,000,000 |  | 554,000,000 |  | 554,000,000 |  | 103,000,000 |
Short term demand note |  | 9,000,000 |  | 9,000,000 |  | 9,000,000 |  | 224,000,000 | [2]
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 | 0.0 | 0.0 |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  | 750,000,000 |  | $ 750,000,000 |  | $ 750,000,000 |  | 632,000,000 |
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 |  | 272,000,000 |  | 272,000,000 |  | 272,000,000 |  | 254,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  | 3,000,000 |  | 3,000,000 |  | 3,000,000 |  | 26,000,000 |
Derivative Liabilities |  | 18,000,000 |  | 18,000,000 |  | 18,000,000 |  | 10,000,000 |
Virginia Electric and Power Company | Principal Owner |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  | 9,000,000 |  | 9,000,000 |  | 9,000,000 |  | 224,000,000 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Due From Related Parties Current |  | 308,000,000 |  | 308,000,000 |  | 308,000,000 |  | 319,000,000 | [4]
Interest income |  |  |  | 30,000,000 |  | 88,000,000 |  |  |
Proceeds From Debt |  |  |  |  |  |  | $ 2,750,000,000 |  |
Facility Limit | [5] | 1,500,000,000 |  | 1,500,000,000 |  | 1,500,000,000 |  |  |
Derivative Asset |  | 5,000,000 |  | 5,000,000 |  | 5,000,000 |  | 31,000,000 |
Derivative Liabilities |  | 117,000,000 |  | 117,000,000 |  | 117,000,000 |  | 19,000,000 |
Amounts due to Dominion, noncurrent |  | 395,000,000 |  | 395,000,000 |  | 395,000,000 |  |  |
Short term demand note |  | 3,129,000,000 |  | 3,129,000,000 |  | 3,129,000,000 |  | 3,097,000,000 | [4]
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  | 160,000,000 |  | 160,000,000 |  | 160,000,000 |  | 218,000,000 |
Interest charges |  |  |  | 1,000,000 | $ 1,000,000 | 2,000,000 | 1,000,000 |  |
Dominion Energy Gas Holdings, LLC | Maximum [Member] | Revolving Credit Facility | IRCA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest On Debt |  |  |  | 1,000,000 |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  | 323,000,000 |  | 323,000,000 |  | 323,000,000 |  | 319,000,000 |
Dominion Energy Gas Holdings, LLC | 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 |  | 15,000,000 |  | 15,000,000 |  | 15,000,000 |  | 13,000,000 |
Discontinued Operations [Member] | Medical Coverage for Local retirees | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  | 4,000,000 |  | 4,000,000 |  | 4,000,000 |  |  |
Discontinued Operations [Member] | Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  | 455,000,000 |  | 455,000,000 |  | 455,000,000 |  | 442,000,000 |
Discontinued Operations [Member] | Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  |  |  |  |  |  |  | 4,000,000 |
Intersegment Eliminations [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  | 551,000,000 | 143,000,000 |  |
Commercial Paper [Member] | Dominion Cove Point L N G L P [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Proceeds From Debt |  |  |  |  |  | 3,000,000,000.0 |  |  |
Commercial Paper [Member] | Dominion Energy Midstream Partners L P [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest On Debt |  |  |  | 4,000,000 |  | 9,000,000 |  |  |
Facility Limit |  | $ 400,000,000 |  | $ 400,000,000 |  | $ 400,000,000 |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 3.50% |  | 3.50% |  | 3.50% |  |  |
Amounts due to Dominion, noncurrent |  | $ 395,000,000 |  | $ 395,000,000 |  | $ 395,000,000 |  |  |
Commercial Paper [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income |  |  |  | 50,000,000 | 22,000,000 | 148,000,000 | 60,000,000 |  |
East Ohio [Member] | Dominion Energy Gas Holdings, LLC | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  | 655,000,000 |  | 655,000,000 |  | 655,000,000 |  |  |
DGP [Member] | Dominion Energy Gas Holdings, LLC | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  |  |  |  |  |  |  | 704,000,000 |
DCPI [Member] | Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  | 2,900,000,000 |  | 2,900,000,000 |  | 2,900,000,000 |  | 2,900,000,000 |
Interest charges |  |  |  | 30,000,000 | 25,000,000 | 88,000,000 | 72,000,000 |  |
DMLPHCII [Member] | Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  | 22,000,000 |  | 22,000,000 |  | 22,000,000 |  | 22,000,000 |
Interest charges |  |  |  | 1,000,000 | $ 1,000,000 | 1,000,000 | $ 1,000,000 |  |
Unbilled Revenues [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Due From Related Parties Current |  | $ 13,000,000 |  | $ 13,000,000 |  | $ 13,000,000 |  | $ 7,000,000 |
[1] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At September 30, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[4] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At September 30, 2019, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.

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