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Landfill and Environmental Remediation Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2020
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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2020 | ​ | December 31, 2019
​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​
​ |  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 110 | ​ | $ | 27 | ​ | $ | 137 | ​ | $ | 138 | ​ | $ | 27 | ​ | $ | 165
Long-term | ​ |  | 1,770 | ​ |  | 221 | ​ |  | 1,991 |  |  | 1,717 | ​ |  | 213 | ​ |  | 1,930
​ |  | $ | 1,880 | ​ | $ | 248 | ​ | $ | 2,128 | ​ | $ | 1,855 | ​ | $ | 240 | ​ | $ | 2,095
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the three months ended March 31, 2020 are reflected in the table below (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Environmental
​ |  | Landfill |  | Remediation
December 31, 2019 | ​ | $ | 1,855 | ​ | $ | 240
Obligations incurred and capitalized | ​ |  | 20 |  |  | —
Obligations settled | ​ |  | (18) |  |  | (5)
Interest accretion | ​ |  | 24 |  |  | 1
Revisions in estimates and interest rate assumptions (a) | ​ |  | 3 |  |  | 12
Acquisitions, divestitures and other adjustments | ​ |  | (4) |  |  | —
March 31, 2020 | ​ | $ | 1,880 | ​ | $ | 248
(a) | The amount reported for our environmental remediation liabilities includes an increase of $12 million due to a decrease in the risk-free discount rate used to measure our liabilities from 1.75% at December 31, 2019 to 0.75% at March 31, 2020.

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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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