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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity | [1] |  |  | $ 6,000,000,000 |  |  |  | $ 6,000,000,000
Questar Gas |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  | 250,000,000 |  |  |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  | $ 73,000,000 |
Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  | $ 2,200,000,000 |  |  |
South Carolina Generating Company Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  | $ 200,000,000 |  |  |
Six Billion Joint Revolving Credit Facility | Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  | 500,000,000 |
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  | 30,000,000 |  |  |  |
Credit Facilities Maturing In May 2018 With 1 Year Automatic Renewals Through 2024 [Member] | Dominion Solar Projects III, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  | 25,000,000 |  |  |  |
Term Loan Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | $ 3,000,000,000.0 |  |  |  |  | $ 3,000,000,000.0
Weighted average useful life |  |  | 364 days |  |  |  |  |
Term Loan Due in 2021 | Dominion Energy Questar Corporation |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of principal |  | $ 1,000,000,000.0 |  | 2,000,000,000.0 |  |  |  |
Term Loan Due in 2021 | Cove Point |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of principal |  |  |  | 3,000,000,000.0 |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  | $ 21,000,000 |
Credit facility, outstanding amount |  |  |  | $ 21,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  | $ 700,000,000 |  |
[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.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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