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Landfill and Environmental Remediation Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019 | ​ | 2018
​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​
​ |  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 138 | ​ | $ | 27 | ​ | $ | 165 | ​ | $ | 143 | ​ | $ | 26 | ​ | $ | 169
Long-term | ​ |  | 1,717 | ​ |  | 213 | ​ |  | 1,930 |  |  | 1,617 | ​ |  | 211 | ​ |  | 1,828
​ |  | $ | 1,855 | ​ | $ | 240 | ​ | $ | 2,095 | ​ | $ | 1,760 | ​ | $ | 237 | ​ | $ | 1,997
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the year ended December 31, 2019 are reflected in the table below (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Environmental
​ |  | Landfill |  | Remediation
December 31, 2018 | ​ | $ | 1,760 | ​ | $ | 237
Obligations incurred and capitalized | ​ |  | 72 |  |  | —
Obligations settled | ​ |  | (113) |  |  | (22)
Interest accretion | ​ |  | 98 |  |  | 4
Revisions in estimates and interest rate assumptions (a) (b) | ​ |  | 33 |  |  | 21
Acquisitions, divestitures and other adjustments | ​ |  | 5 |  |  | —
December 31, 2019 | ​ | $ | 1,855 | ​ | $ | 240
(a) | The amount reported for our landfill liabilities includes revisions in estimates resulting primarily from changes in the timing and amount of costs as well as changes in estimates of remaining airspace.
(b) | The amount reported for our environmental remediation liabilities includes an increase of $11 million due to a decrease in the risk-free discount rate used to measure our liabilities from 2.75% at December 31, 2018 to 1.75% at December 31, 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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- Definition Asset Retirement Obligation And Environmental Remediation Rollforward Analysis Table [Text Block] + References No definition available. + Details
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