Other Noncurrent Liabilities

12 Months Ended

Dec. 31, 2019

Other Liabilities Disclosure [Abstract]

Other Noncurrent Liabilities

Other Noncurrent Liabilities

Other noncurrent liabilities consisted of the following:

	December 31, 2019		December 31, 2018
	(in millions)
Reserve for underground storage tank removal	$	67	$	54
Accrued environmental expense, long-term	23		29
Unfavorable lease liability (1)	—		16
Others	7		24
Total	$	97	$	123

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(1) As a part of ASC 842, unfavorable lease liabilities were reclassed to adjust the operating lease right-of-use asset.

We record an asset retirement obligation for the estimated future cost to remove underground storage tanks. Revisions to the liability could occur due to changes in tank removal costs, tank useful lives or if federal and/or state regulators enact new guidance on the removal of such tanks. Changes in the carrying amount of asset retirement obligations for the years ended December 31, 2019 and 2018 were as follows:

	Year Ended December 31,
	2019			2018
	(in millions)
Balance at beginning of year	$	54		$	41
Liabilities incurred	12			4
Liabilities settled	(1		)	(1		)
Accretion expense	2			10
Balance at end of year	$	67		$	54