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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Changes to Asset Retirement Obligations | The changes to AROs during 2018 and 2019 were as follows:
|  | Amount |
(millions) |  |  |
Dominion Energy |  |  |  |
AROs at December 31, 2017 |  | $ | 2,432 |
Obligations incurred during the period |  |  | 20 |
Obligations settled during the period |  |  | (159 | )
Revisions in estimated cash flows (2) |  |  | 120 |
Accretion |  |  | 119 |
AROs at December 31, 2018 (1) |  | $ | 2,532 |
Obligations incurred during the period (2) |  |  | 2,413 |
Obligations settled during the period |  |  | (137 | )
AROs acquired in the SCANA Combination |  |  | 577 |
Revisions in estimated cash flows (3) |  |  | (324 | )
Accretion |  |  | 213 |
AROs at December 31, 2019 (1) |  | $ | 5,274 |
Virginia Power |  |  |  |
AROs at December 31, 2017 |  | $ | 1,365 |
Obligations incurred during the period |  |  | 14 |
Obligations settled during the period |  |  | (119 | )
Revisions in estimated cash flows (2) |  |  | 120 |
Accretion |  |  | 65 |
AROs at December 31, 2018 |  | $ | 1,445 |
Obligations incurred during the period ( 2 ) |  |  | 2,408 |
Obligations settled during the period |  |  | (81 | )
Revisions in estimated cash flows (3) |  |  | (323 | )
Accretion |  |  | 132 |
AROs at December 31, 2019 |  | $ | 3,581 |
Dominion Energy Gas |  |  |  |
AROs at December 31, 2017 |  | $ | 85 |
Obligations incurred during the period |  |  | 3 |
Obligations settled during the period |  |  | (6 | )
Accretion |  |  | 6 |
AROs at December 31, 2018 ( 4 ) |  | $ | 88 |
Obligations settled during the period |  |  | (3 | )
Accretion |  |  | 4 |
AROs at December 31, 2019 ( 4 ) |  | $ | 89 |
(1) | Includes $282 million and $408 million reported in other current liabilities at December 31, 2018, and 2019, respectively.
(2) | Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.
(3) | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities as well as revisions for 20 year license extensions for regulated nuclear power stations in Virginia.
(4) | Includes $74 million and $75 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and 2019, respectively.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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