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Asset Retirement Obligations (Changes to AROs) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |  |
Asset retirement obligations, non current | $ 5,020 | $ 2,250 | [1]
Virginia Electric and Power Company |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset retirement obligations, non current | 3,418 | 1,200 | [2]
Current Liabilities |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset retirement obligations | 317 | 282 |
Current Liabilities | Virginia Electric and Power Company |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset retirement obligations | 262 | 245 |
Other Deferred Credits And Other Liabilities | Dominion Energy Gas Holdings, LLC |  |  |
Asset Retirement Obligations [Line Items] |  |  |
Asset retirement obligations, non current | $ 134 | $ 153 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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