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Asset Retirement Obligations (Changes to AROs) (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($)
Asset Retirement Obligations [Line Items] |  |
AROs, Beginning balance | $ 2,532 | [1]
Obligations incurred during the period | 2,404 | [2]
Obligations settled during the period | (100) |
AROs acquired in the SCANA Combination | 577 |
Revisions in estimated cash flows | (229) | [2]
Accretion | 153 |
AROs, Ending balance | 5,337 | [1]
Virginia Electric and Power Company |  |
Asset Retirement Obligations [Line Items] |  |
AROs, Beginning balance | 1,445 | [3]
Obligations incurred during the period | 2,403 | [2]
Obligations settled during the period | (60) |
Revisions in estimated cash flows | (202) | [2]
Accretion | 94 |
AROs, Ending balance | 3,680 | [3]
Dominion Energy Gas Holdings, LLC |  |
Asset Retirement Obligations [Line Items] |  |
AROs, Beginning balance | 88 | [4]
Obligations settled during the period | (2) |
Accretion | 3 |
AROs, Ending balance | $ 89 | [4]
[1] | Includes $282 million and $317 million reported in other current liabilities at December 31, 2018 and September 30, 2019, respectively.
[2] | Primarily related to future ash pond and landfill closure costs at certain utility generation facilities. See Note 18 for further information.
[3] | Includes $245 million and $262 million reported in other current liabilities at December 31, 2018 and September 30, 2019, respectively.
[4] | Includes $79 million and $76 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and September 30, 2019, respectively.

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- Definition 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 Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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