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Related-Party Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 | Jun. 30, 2018 | Feb. 28, 2018 | May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | $ 294,000,000 |  | $ 307,000,000 |  |
Derivative Liabilities |  |  |  |  | 279,000,000 |  | 284,000,000 |  |
Interest income |  |  |  |  | 11,000,000 |  | 11,000,000 |  |
Facility Limit |  |  |  |  | 6,000,000,000 | [1] | 5,500,000,000 |  |
DMLPHCII |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissorry note term |  |  |  |  |  |  |  | 5 years |
Unbilled Revenues [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Affiliated receivables |  |  |  |  | 7,000,000 |  | 7,000,000 |  |
Commercial Paper | DMLPHCII |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.75% |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 15,000,000.0 |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 500,000,000 | $ 950,000,000 |  | 3,000,000,000.0 |  |  |  |
Promissorry note term |  | 364 days | 364 days |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | $ 500,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  | 0 |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 31,000,000 |  | 33,000,000 |  |
Derivative Liabilities |  |  |  |  | 19,000,000 |  | 8,000,000 |  |
Short term demand note |  |  |  |  | 3,097,000,000 |  | 2,806,000,000 |  |
Affiliated receivables |  |  |  |  | 319,000,000 |  | 65,000,000 |  |
Payables to affiliates |  |  |  |  | 124,000,000 |  | 138,000,000 |  |
Facility Limit |  |  |  |  | 1,500,000,000 | [2] | 1,500,000,000 |  |
Distributions to affiliates |  |  |  |  | 230,000,000 |  | 239,000,000 | 868,000,000 |
Dominion Energy Gas Holdings, LLC | Commercial Paper |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  | $ 79,000,000 |  | $ 69,000,000 | 54,000,000 |
Dominion Energy Gas Holdings, LLC | Three Point Eight Zero Promissory Notes [Member] | Commercial Paper |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.80% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 1,400,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Five Point One Seven Promissory Notes [Member] | Commercial Paper |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.17% |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,400,000,000 |  |
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  |  |  |  | $ 218,000,000,000 |  | $ 18,000,000,000 |  |
Weighted- average interest rate percentage |  |  |  |  | 2.78% |  | 1.60% |  |
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA | DCPI |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  |  |  |  | $ 2,900,000,000 |  | $ 2,700,000,000 |  |
Interest Rate |  |  |  |  | 3.43% |  | 3.45% |  |
Interest charges related to others |  |  |  |  | $ 96,000,000 |  | $ 82,000,000 | 47,000,000 |
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA | DMLPHCII |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  |  |  |  | $ 22,000,000 |  | $ 21,000,000 |  |
Interest Rate |  |  |  |  | 3.43% |  | 3.45% |  |
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA | Maximum | DMLPHCII |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  | $ 1,000,000 |  |  |  |
Interest charges related to others |  |  |  |  | 1,000,000 |  | $ 1,000,000 | 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 |  |  |  |  | 319,000,000 |  | 305,000,000 |  |
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 |  |  |  |  | 13,000,000 |  | 7,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 93,000,000 |  | 166,000,000 |  |
Derivative Liabilities |  |  |  |  | 103,000,000 |  | 66,000,000 |  |
Short term demand note |  |  |  |  | 224,000,000 |  | 33,000,000 |  |
Affiliated receivables |  |  |  |  | 101,000,000 |  | 3,000,000 |  |
Interest income |  |  |  |  | 11,000,000 |  | 11,000,000 |  |
Payables to affiliates |  |  |  |  | 209,000,000 |  | 125,000,000 |  |
Facility Limit |  |  |  |  | 6,000,000,000 | [3] | 5,500,000,000 |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 26,000,000 |  | 11,000,000 |  |
Derivative Liabilities |  |  |  |  | 10,000,000 |  | 5,000,000 |  |
Virginia Electric and Power Company | Principal Owner |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Short term demand note |  |  |  |  | $ 224,000,000 |  | $ 33,000,000 |  |
Weighted- average interest rate percentage |  |  |  |  | 2.94% |  | 1.65% |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  |  |  |  | $ 632,000,000 |  | $ 505,000,000 |  |
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 |  |  |  |  | 254,000,000 |  | 199,000,000 |  |
Cove Point | Term Loan Credit Agreement | Commercial Paper |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  | $ 3,000,000,000.0 |  |  |  |
Interest Rate |  |  |  |  | 3.60% |  |  |  |
Interest income |  |  |  |  | $ 21,000,000.0 |  |  |  |
Cove Point | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 50,000,000 |  |  |  |
Maturity date |  |  |  |  | Mar. 30, 2019 |  |  |  |
East Ohio | Affiliated Entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Payables to affiliates |  |  |  |  | $ 704,000,000 |  |  |  |
Dominion Gathering and Processing Inc | Affiliated Entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Payables to affiliates |  |  |  |  |  |  | 519,000,000 |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  | 1,000,000 |  | 2,000,000 |  |
Credit facility, outstanding amount |  |  |  |  | $ 73,000,000 |  | 26,400,000 |  |
Facility Limit |  |  |  |  |  |  | $ 300,000,000 |  |
Repayments under facility | $ 73,000,000 |  |  | $ 73,000,000.0 |  |  |  |  |
Dominion Energy Midstream Partners, LP | Maximum |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  | $ 1,000,000 |
[1] | This credit facility matures in March 2023 and can be used by the Companies 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] | 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 and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2018, 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.
[3] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2018, 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.

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