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Landfill and Environmental Remediation Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Environmental | ​ | ​ | ​
​ |  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 137 | ​ | $ | 29 | ​ | $ | 166 | ​ | $ | 138 | ​ | $ | 26 | ​ | $ | 164
Long-term | ​ |  | 2,189 | ​ |  | 184 | ​ |  | 2,373 |  |  | 2,018 | ​ |  | 204 | ​ |  | 2,222
​ |  | $ | 2,326 | ​ | $ | 213 | ​ | $ | 2,539 | ​ | $ | 2,156 | ​ | $ | 230 | ​ | $ | 2,386
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the year ended December 31, 2021 are reflected in the table below (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Environmental
​ |  | Landfill |  | Remediation
December 31, 2020 | ​ | $ | 2,156 | ​ | $ | 230
Obligations incurred and capitalized | ​ |  | 117 |  |  | —
Obligations settled | ​ |  | (101) |  |  | (22)
Interest accretion | ​ |  | 108 |  |  | 3
Revisions in estimates and interest rate assumptions (a) | ​ |  | 33 |  |  | 2
Acquisitions, divestitures and other adjustments (b) | ​ |  | 13 |  |  | —
December 31, 2021 | ​ | $ | 2,326 | ​ | $ | 213
(a) | The amount reported for our landfill liabilities includes an increase of $15 million due to a business decision to accelerate the closure timing of a landfill in our West Tier segment, which resulted in the acceleration of the expected timing of capping, closure and post-closure activities. The remaining increase relates to revisions in estimated costs and timing of capping, closure and post-closure liabilities.
(b) | The amount reported for our landfill liabilities includes an increase of $13 million related to changes in the fair values assigned to certain acquired Advanced Disposal sites.

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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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