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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation [Abstract] |
Changes to Asset Retirement Obligations | The changes to AROs during 2015 and 2016 were as follows:
| Amount |
(millions) |
Dominion |
AROs at December 31, 2014 | $ | 1,714 |
Obligations incurred during the period(1) | 315 |
Obligations settled during the period | (106 | )
Revisions in estimated cash flows(1) | 88 |
Accretion | 93 |
Other | (1 | )
AROs at December 31, 2015(2) | $ | 2,103 |
Obligations incurred during the period(3) | 204 |
Obligations settled during the period | (171 | )
Revisions in estimated cash flows(1) | 245 |
Accretion | 104 |
AROs at December 31, 2016(2) | $ | 2,485 |
Virginia Power |  |
AROs at December 31, 2014 | $ | 855 |
Obligations incurred during the period(1) | 289 |
Obligations settled during the period | (39 | )
Revisions in estimated cash flows(1) | 92 |
Accretion | 50 |
AROs at December 31, 2015 | $ | 1,247 |
Obligations incurred during the period | 9 |
Obligations settled during the period | (115 | )
Revisions in estimated cash flows(1) | 245 |
Accretion | 57 |
AROs at December 31, 2016 | $ | 1,443 |
Dominion Gas |  |
AROs at December 31, 2014 | $ | 147 |
Obligations incurred during the period | 5 |
Obligations settled during the period | (6 | )
Revisions in estimated cash flows | (5 | )
Accretion | 9 |
Other | (1 | )
AROs at December 31, 2015(4) | $ | 149 |
Obligations incurred during the period | 6 |
Obligations settled during the period | (8 | )
Revisions in estimated cash flows | — |
Accretion | 9 |
AROs at December 31, 2016(4) | $ | 156 |
(1) | Primarily reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 22 for further information.
(2) | Includes $216 million and $249 million reported in other current liabilities at December 31, 2015, and 2016, respectively.
(3) | Primarily reflects AROs assumed in the Dominion Questar Combination. See Note 3 for further information.
(4) | Includes $137 million and $147 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2015 and 2016, 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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