2. Landfill and Environmental Remediation Liabilities

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


	March 31, 2018						December 31, 2017
			Environmental						Environmental
	Landfill		Remediation		Total		Landfill		Remediation		Total
Current (in accrued liabilities)	$	129	$	28	$	157	$	128	$	28	$	156
Long-term		1,572		223		1,795		1,547		223		1,770
	$	1,701	$	251	$	1,952	$	1,675	$	251	$	1,926

The changes to landfill and environmental remediation liabilities for the three months ended March 31, 2018 are reflected in the table below (in millions):


			Environmental
	Landfill		Remediation
December 31, 2017	$	1,675	$	251
Obligations incurred and capitalized		19		—
Obligations settled		(19)		(5)
Interest accretion		23		1
Revisions in estimates and interest rate assumptions		(9)		4
Acquisitions, divestitures and other adjustments		12		—
March 31, 2018	$	1,701	$	251

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.