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Landfill and Environmental Remediation Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
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):
|  | 2018 |  | 2017
|  |  |  |  | Environmental |  |  |  |  |  |  |  | Environmental |  |  |
|  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 143 |  | $ | 26 |  | $ | 169 |  | $ | 128 |  | $ | 28 |  | $ | 156
Long-term |  |  | 1,617 |  |  | 211 |  |  | 1,828 |  |  | 1,547 |  |  | 223 |  |  | 1,770
|  | $ | 1,760 |  | $ | 237 |  | $ | 1,997 |  | $ | 1,675 |  | $ | 251 |  | $ | 1,926
Changes to Landfill and Environmental Remediation Liabilities | The changes to landfill and environmental remediation liabilities for the year ended December 31, 2018 are reflected in the table below (in millions):
|  |  |  |  | Environmental
|  | Landfill |  | Remediation
December 31, 2017 |  | $ | 1,675 |  | $ | 251
Obligations incurred and capitalized |  |  | 83 |  |  | —
Obligations settled |  |  | (108) |  |  | (26)
Interest accretion |  |  | 95 |  |  | 5
Revisions in estimates and interest rate assumptions (a) (b) |  |  | (3) |  |  | 9
Acquisitions, divestitures and other adjustments (c) |  |  | 18 |  |  | (2)
December 31, 2018 |  | $ | 1,760 |  | $ | 237
| (a) |  | The amount reported for our landfill liabilities includes a net decrease of $15 million primarily related to our year-end annual review of landfill final capping, closure and post-closure obligations partially offset by an increase of $12 million due to the acceleration of the expected timing of capping activities for a landfill. See Note 11 for discussion of the impairment charge related to this landfill.
| (b) |  | The amount reported for our environmental remediation liabilities includes changes in cost estimates associated with environmental remediation projects resulting in an increase in the required obligation. These charges were partially offset by a decrease of $3 million in our environmental remediation liabilities due to an increase in the risk-free discount rate used to measure our liabilities from 2.5% at December 31, 2017 to 2.75% at December 31, 2018.
| (c) |  | The amount reported for our landfill liabilities includes an increase of $27 million due to landfill acquisitions partially offset by landfill divestitures and other adjustments.

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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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