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Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Detail) - USD ($)
$ in Millions

Sep. 30, 2019

Dec. 31, 2018

Carrying Amount

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[1]

$ 34,662

$ 29,952

Credit facility borrowings

73

Junior subordinated notes

^[2]

3,797

3,430

Remarketable subordinated notes

^[2]

1,386

Estimate of Fair Value

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[1],[3]

38,894

31,045

Credit facility borrowings

^[3]

73

Junior subordinated notes

^[2],[3]

3,951

3,358

Remarketable subordinated notes

^[2],[3]

1,340

Virginia Electric and Power Company | Carrying Amount

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[2]

11,795

11,671

Virginia Electric and Power Company | Estimate of Fair Value

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[2],[3]

13,732

12,400

Dominion Energy Gas Holdings, LLC

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Affiliated Long-Term Debt

395

Dominion Energy Gas Holdings, LLC | Carrying Amount

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[4]

4,478

7,770

Affiliated Long-Term Debt

395

Credit facility borrowings

73

Dominion Energy Gas Holdings, LLC | Estimate of Fair Value

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, including securities due within one year

^[3],[4]

4,745

7,803

Affiliated Long-Term Debt

$ 395

Credit facility borrowings

^[3]

$ 73

[1]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium and foreign currency remeasurement adjustments. At September 30, 2019 and December 31, 2018, includes the valuation of certain fair value hedges associated with fixed rate debt of $6 million and $(20) million, respectively.
[2]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium.
[3]	Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.
[4]	Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium and foreign currency remeasurement adjustments.

X

- Definition

Remarketable Subordinated Notes, Fair Value Disclosure

+ References

No definition available.

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- Definition

Amount of receivables owed to an entity that is affiliated with the reporting entity by means of direct or indirect ownership, which are usually due after one year (or one business cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
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-Name Accounting Standards Codification
-Topic 850
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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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