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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Changes to Asset Retirement Obligations | The changes to AROs during 2019 and 2020 were as follows:
| Amount |
(millions) |  |  |
Dominion Energy |  |  |
AROs at December 31, 2018 | $ | 2,444 |
Obligations incurred during the period(1) |  | 2,413 |
AROs acquired in the SCANA Combination |  | 577 |
Obligations settled during the period |  | (134 | )
Revisions in estimated cash flows(2) |  | (324 | )
Accretion |  | 208 |
AROs at December 31, 2019(3) | $ | 5,184 |
Obligations incurred during the period |  | 67 |
Obligations settled during the period |  | (114 | )
Revisions in estimated cash flows(4) |  | 228 |
Accretion |  | 218 |
AROs at December 31, 2020(3) | $ | 5,583 |
Virginia Power |  |  |
AROs at December 31, 2018 | $ | 1,445 |
Obligations incurred during the period(1) |  | 2,408 |
Obligations settled during the period |  | (81 | )
Revisions in estimated cash flows(2) |  | (323 | )
Accretion |  | 132 |
AROs at December 31, 2019 | $ | 3,581 |
Obligations incurred during the period |  | 48 |
Obligations settled during the period |  | (85 | )
Revisions in estimated cash flows(5) |  | 139 |
Accretion |  | 137 |
AROs at December 31, 2020 | $ | 3,820 |
(1) | Reflects future ash pond and landfill closure costs at certain utility generation facilities. See discussion below.
(2) | 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.
(3) | Includes $394 million and $179 million reported in other current liabilities at December 31, 2019 and 2020, respectively.
(4) | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities, asbestos abatement costs associated with certain utility facilities and from the completion of a nuclear decommissioning cost study related to Summer.
(5) | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities and asbestos abatement costs associated with certain utility facilities.

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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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