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Landfill and Environmental Remediation Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Landfill and Environmental Remediation Liabilities |
Liabilities for Landfill and Environmental Remediation Costs | Liabilities for landfill and environmental remediation costs as of December 31 are presented in the table below (in millions):
|  | 2017 |  | 2016
|  |  |  |  | Environmental |  |  |  |  |  |  |  | Environmental |  |  |
|  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 128 |  | $ | 28 |  | $ | 156 |  | $ | 119 |  | $ | 28 |  | $ | 147
Long-term |  |  | 1,547 |  |  | 223 |  |  | 1,770 |  |  | 1,457 |  |  | 218 |  |  | 1,675
|  | $ | 1,675 |  | $ | 251 |  | $ | 1,926 |  | $ | 1,576 |  | $ | 246 |  | $ | 1,822
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the year ended December 31, 2017 are reflected in the table below (in millions):
|  |  |  |  | Environmental
|  | Landfill |  | Remediation
December 31, 2016 |  | $ | 1,576 |  | $ | 246
Obligations incurred and capitalized |  |  | 69 |  |  | —
Obligations settled |  |  | (105) |  |  | (21)
Interest accretion |  |  | 92 |  |  | 4
Revisions in estimates and interest rate assumptions (a) (b) |  |  | 33 |  |  | 23
Acquisitions, divestitures and other adjustments |  |  | 10 |  |  | (1)
December 31, 2017 |  | $ | 1,675 |  | $ | 251
| (a) |  | The amount reported for our landfill liabilities includes (i) a net increase of $19 million related to our year-end annual review of landfill final capping, closure and post-closure obligations and (ii) an increase of $12 million primarily for enhancements to our gas and leachate collection systems at certain closed landfills.
| (b) |  | Our environmental remediation liabilities include $11 million of charges to adjust our subsidiary’s estimated potential share of an environmental remediation liability and related costs for a closed site in Harris County, Texas, as discussed in Note 10.

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- Definition Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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