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Landfill and Environmental Remediation Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Landfill and Environmental Remediation Liabilities |
Liabilities for Landfill and Environmental Remediation Costs | Liabilities for landfill and environmental remediation costs are presented in the table below (in millions):
|  | September 30, 2018 |  | December 31, 2017
|  |  |  |  | Environmental |  |  |  |  |  |  |  | Environmental |  |  |
|  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 131 |  | $ | 27 |  | $ | 158 |  | $ | 128 |  | $ | 28 |  | $ | 156
Long-term |  |  | 1,622 |  |  | 210 |  |  | 1,832 |  |  | 1,547 |  |  | 223 |  |  | 1,770
|  | $ | 1,753 |  | $ | 237 |  | $ | 1,990 |  | $ | 1,675 |  | $ | 251 |  | $ | 1,926
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the nine months ended September 30, 2018 are reflected in the table below (in millions):
|  |  |  |  | Environmental
|  | Landfill |  | Remediation
December 31, 2017 |  | $ | 1,675 |  | $ | 251
Obligations incurred and capitalized |  |  | 62 |  |  | —
Obligations settled |  |  | (71) |  |  | (18)
Interest accretion |  |  | 71 |  |  | 4
Revisions in estimates and interest rate assumptions (a) (b) |  |  | 7 |  |  | 2
Acquisitions, divestitures and other adjustments |  |  | 9 |  |  | (2)
September 30, 2018 |  | $ | 1,753 |  | $ | 237
| (a) |  | The amount reported for our landfill liabilities includes an increase of $11 million due to the acceleration of the expected timing of capping activities for a landfill. See Note 10 for discussion of the impairment charge related to this landfill.
| (b) |  | The amount reported for our environmental remediation liabilities includes the impact of an increase in the risk-free discount rate used to measure our liabilities from 2.5% at December 31, 2017 to 3.0% at September 30, 2018, resulting in a decrease of $5 million to our environmental remediation liabilities.

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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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