2. Landfill and Environmental Remediation Liabilities

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


	September 30, 2012						December 31, 2011
	Landfill		Environmental Remediation		Total		Landfill		Environmental Remediation		Total
Current (in accrued liabilities)	$	118	$	36	$	154	$	123	$	38	$	161
Long-term		1,225		228		1,453		1,169		235		1,404

	$	1,343	$	264	$	1,607	$	1,292	$	273	$	1,565

The changes to landfill and environmental remediation liabilities for the year ended December 31, 2011 and the nine months ended September 30, 2012 are reflected in the table below (in millions):


	Landfill			Environmental Remediation
December 31, 2010	$	1,266		$	284
Obligations incurred and capitalized		49			—
Obligations settled		(80	)		(37	)
Interest accretion		84			6
Revisions in cost estimates and interest rate assumptions		(30	)		23
Acquisitions, divestitures and other adjustments		3			(3	)

December 31, 2011		1,292			273
Obligations incurred and capitalized		43			—
Obligations settled		(58	)		(19	)
Interest accretion		62			3
Revisions in cost estimates and interest rate assumptions		4			7
Acquisitions, divestitures and other adjustments		—			—

September 30, 2012	$	1,343		$	264

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.