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Landfill and Environmental Remediation Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019 | ​ | December 31, 2018
​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​
​ |  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 125 | ​ | $ | 26 | ​ | $ | 151 | ​ | $ | 143 | ​ | $ | 26 | ​ | $ | 169
Long-term | ​ |  | 1,685 | ​ |  | 215 | ​ |  | 1,900 |  |  | 1,617 | ​ |  | 211 | ​ |  | 1,828
​ |  | $ | 1,810 | ​ | $ | 241 | ​ | $ | 2,051 | ​ | $ | 1,760 | ​ | $ | 237 | ​ | $ | 1,997
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the six months ended June 30, 2019 are reflected in the table below (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Environmental
​ |  | Landfill |  | Remediation
December 31, 2018 | ​ | $ | 1,760 | ​ | $ | 237
Obligations incurred and capitalized | ​ |  | 36 |  |  | —
Obligations settled | ​ |  | (41) |  |  | (9)
Interest accretion | ​ |  | 47 |  |  | 3
Revisions in estimates and interest rate assumptions (a) | ​ |  | 3 |  |  | 10
Acquisitions, divestitures and other adjustments | ​ |  | 5 |  |  | —
June 30, 2019 | ​ | $ | 1,810 | ​ | $ | 241
(a) | The amount reported for our environmental remediation liabilities includes an increase of $8 million due to a decrease in the risk-free discount rate used to measure our liabilities from 2.75% at December 31, 2018 to 2.0% at June 30, 2019.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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