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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | $ 209 | $ 294
Current Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 113 | 223
Dominion Energy Gas Holdings, LLC |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 16 | 31
Dominion Energy Gas Holdings, LLC | Current Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [1] | $ 2 | 5
Dominion Energy Gas Holdings, LLC | Current Assets | Discontinued Operations |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  |  | $ 2
[1] | Current derivative assets include $2 million in other current assets at December 31, 2018, with the remainder recorded in current assets of discontinued operations in Dominion Energy Gas’ Consolidated Balance Sheets. All current derivative assets are included in current assets of discontinued operations of Dominion Energy Gas’ Consolidated Balance Sheets at June 30, 2019.

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- 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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