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.