Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	As of September 30, 2020						As of September 30, 2019
	Gathering and Processing		Logistics and Marketing		Total		Gathering and Processing		Logistics and Marketing		Total
	(millions)
Balance, beginning of period	$	159	$	—	$	159	$	159	$	72	$	231
Impairment	(159)		—		(159)		—		(35)		(35)
Dispositions	—		—		—		—		(37)		(37)
Balance, end of period	$	—	$	—	$	—	$	159	$	—	$	159

Schedule of Finite-Lived Intangible Assets

	September 30,		December 31,
	2020		2019
	(millions)
Gross carrying amount	$	145	$	145
Accumulated amortization	(88)		(84)
Accumulated impairment	(11)		—
Intangible assets, net	$	46	$	61