Other noncurrent liabilities (Tables)

3 Months Ended

Mar. 31, 2020

Change of asset retirement obligations [Abstract]

Other Noncurrent Liabilities [Table Text Block]

	March 31, 2020		December 31, 2019
	(in millions)
Reserve for underground storage tank removal	$	68	$	67
Accrued environmental expense, long-term	22		23
Other	5		7
Total	$	95	$	97