Landfill and Environmental Remediation Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Landfill and Environmental Remediation Liabilities

Liabilities for Landfill and Environmental Remediation Costs

Liabilities for landfill and environmental remediation costs as of December 31 are presented in the table below (in millions):

	2019						2018
			Environmental						Environmental
	Landfill		Remediation		Total		Landfill		Remediation		Total
Current (in accrued liabilities)	$	138	$	27	$	165	$	143	$	26	$	169
Long-term		1,717		213		1,930		1,617		211		1,828
	$	1,855	$	240	$	2,095	$	1,760	$	237	$	1,997

Changes to Landfill and Environmental Remediation Liabilities

The changes to landfill and environmental remediation liabilities for the year ended December 31, 2019 are reflected in the table below (in millions):

			Environmental
	Landfill		Remediation
December 31, 2018	$	1,760	$	237
Obligations incurred and capitalized		72		—
Obligations settled		(113)		(22)
Interest accretion		98		4
Revisions in estimates and interest rate assumptions (a) (b)		33		21
Acquisitions, divestitures and other adjustments		5		—
December 31, 2019	$	1,855	$	240

(a) The amount reported for our landfill liabilities includes revisions in estimates resulting primarily from changes in the timing and amount of costs as well as changes in estimates of remaining airspace.

(b) The amount reported for our environmental remediation liabilities includes an increase of $11 million due to a decrease in the risk-free discount rate used to measure our liabilities from 2.75% at December 31, 2018 to 1.75% at December 31, 2019.