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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Changes to Asset Retirement Obligations | The changes to AROs during 2016 and 2017 were as follows:
|  | Amount |
(millions) |  |  |
Dominion Energy |  |  |  |
AROs at December 31, 2015 |  | $ | 2,103 |
Obligations incurred during the period(1) |  |  | 204 |
Obligations settled during the period |  |  | (171 | )
Revisions in estimated cash flows(2) |  |  | 245 |
Accretion |  |  | 104 |
AROs at December 31, 2016(3) |  | $ | 2,485 |
Obligations incurred during the period |  |  | 37 |
Obligations settled during the period |  |  | (214 | )
Revisions in estimated cash flows |  |  | 7 |
Accretion |  |  | 117 |
AROs at December 31, 2017(3) |  | $ | 2,432 |
Virginia Power |  |  |  |
AROs at December 31, 2015 |  | $ | 1,247 |
Obligations incurred during the period |  |  | 9 |
Obligations settled during the period |  |  | (115 | )
Revisions in estimated cash flows(2) |  |  | 245 |
Accretion |  |  | 57 |
AROs at December 31, 2016 |  | $ | 1,443 |
Obligations incurred during the period |  |  | 11 |
Obligations settled during the period |  |  | (152 | )
Revisions in estimated cash flows |  |  | (1 | )
Accretion |  |  | 64 |
AROs at December 31, 2017 |  | $ | 1,365 |
Dominion Energy Gas |  |  |  |
AROs at December 31, 2015 |  | $ | 149 |
Obligations incurred during the period |  |  | 6 |
Obligations settled during the period |  |  | (8 | )
Accretion |  |  | 9 |
AROs at December 31, 2016(4) |  | $ | 156 |
Obligations incurred during the period |  |  | 2 |
Obligations settled during the period |  |  | (7 | )
Accretion |  |  | 9 |
AROs at December 31, 2017(4) |  | $ | 160 |
(1) | Primarily reflects AROs assumed in the Dominion Energy Questar Combination. See Note 3 for further information.
(2) | Primarily reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 22 for further information.
(3) | Includes $249 million and $263 million reported in other current liabilities at December 31, 2016, and 2017, respectively.
(4) | Includes $147 million and $146 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2016 and 2017, 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://www.xbrl.org/2003/role/presentationRef -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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