Contract Liabilities (Tables)

6 Months Ended

Jun. 30, 2020

Contract Assets and Liabilities [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

	June 30,
	2020
	(millions)
Balance, beginning of period	$	33
Additions	3
Revenue recognized (a)	(1)
Balance, end of period	$	35

(a) Deferred revenue recognized is included in transportation, processing and other on the condensed consolidated statement of operations.