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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Parenthetical) (Detail) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

Derivatives, Fair Value [Line Items]

Derivative asset

$ 173

$ 294

Other Current Assets [Member]

Derivatives, Fair Value [Line Items]

Derivative asset

^[1]

96

223

Dominion Energy Gas Holdings, LLC

Derivatives, Fair Value [Line Items]

Derivative asset

13

31

Dominion Energy Gas Holdings, LLC | Other Current Assets [Member]

Derivatives, Fair Value [Line Items]

Derivative asset

^[2]

5

Dominion Energy Gas Holdings, LLC | Other Current Assets [Member] | Discontinued Operations [Member]

Derivatives, Fair Value [Line Items]

Derivative asset

$ 2

$ 2

[1]	Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[2]	Current derivative assets include $2 million in other current assets, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets.

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: 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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

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Balance Type:	debit
Period Type:	instant

X

- 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

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=d_DominionEnergyGasHoldingsLLCMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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