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Landfill and Environmental Remediation Liabilities | 6 Months Ended
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Jun. 30, 2018
Landfill and Environmental Remediation Liabilities |
Landfill and Environmental Remediation Liabilities | 2. Landfill and Environmental Remediation Liabilities Liabilities for landfill and environmental remediation costs are presented in the table below (in millions):
|  | June 30, 2018 |  | December 31, 2017
|  |  |  |  | Environmental |  |  |  |  |  |  |  | Environmental |  |  |
|  | Landfill |  | Remediation |  | Total |  | Landfill |  | Remediation |  | Total
Current (in accrued liabilities) |  | $ | 130 |  | $ | 28 |  | $ | 158 |  | $ | 128 |  | $ | 28 |  | $ | 156
Long-term |  |  | 1,589 |  |  | 221 |  |  | 1,810 |  |  | 1,547 |  |  | 223 |  |  | 1,770
|  | $ | 1,719 |  | $ | 249 |  | $ | 1,968 |  | $ | 1,675 |  | $ | 251 |  | $ | 1,926
The changes to landfill and environmental remediation liabilities for the six months ended June 30, 2018 are reflected in the table below (in millions):
|  |  |  |  | Environmental
|  | Landfill |  | Remediation
December 31, 2017 |  | $ | 1,675 |  | $ | 251
Obligations incurred and capitalized |  |  | 41 |  |  | —
Obligations settled |  |  | (45) |  |  | (10)
Interest accretion |  |  | 47 |  |  | 2
Revisions in estimates and interest rate assumptions |  |  | (7) |  |  | 6
Acquisitions, divestitures and other adjustments |  |  | 8 |  |  | —
June 30, 2018 |  | $ | 1,719 |  | $ | 249
At several of our landfills, we provide financial assurance by depositing cash into restricted trust funds or escrow accounts for purposes of demonstrating our ability to meet our final capping, closure, post-closure and environmental remediation obligations. Generally, these trust funds are established to comply with statutory requirements and operating agreements. See Note 13 for additional information related to these trusts.

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