2. Landfill and Environmental Remediation Liabilities

Liabilities for landfill and environmental remediation costs are presented in the table below (in millions):


	September 30, 2017						December 31, 2016
			Environmental						Environmental
	Landfill		Remediation		Total		Landfill		Remediation		Total
Current (in accrued liabilities)	$	140	$	23	$	163	$	119	$	28	$	147
Long-term		1,500		227		1,727		1,457		218		1,675
	$	1,640	$	250	$	1,890	$	1,576	$	246	$	1,822

The changes to landfill and environmental remediation liabilities for the nine months ended September 30, 2017 are reflected in the table below (in millions):


			Environmental
	Landfill		Remediation
December 31, 2016	$	1,576	$	246
Obligations incurred and capitalized		51		—
Obligations settled		(74)		(14)
Interest accretion		68		2
Revisions in estimates and interest rate assumptions (a)		14		16
Acquisitions, divestitures and other adjustments		5		—
September 30, 2017	$	1,640	$	250

(a)

Includes a $9 million charge to adjust our subsidiary’s estimated potential share of an environmental remediation liability and related costs for a closed site in Harris County, Texas, as further discussed in Note 6.

At several of our landfills, we provide financial assurance by depositing cash into restricted trust funds or escrow accounts for purposes of settling 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.