Impairment of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2017
Goodwill [Roll Forward]
Balance as of December 31, 2019	$ 12
Goodwill impairment	(12)
Balance as of June 30, 2020	0
Gathering and Processing
Goodwill [Roll Forward]
Balance as of December 31, 2019	12
Goodwill acquired		$ 12
Goodwill impairment	(12)
Balance as of June 30, 2020	0
Transportation and Storage
Goodwill [Roll Forward]
Balance as of December 31, 2019	0
Goodwill impairment	0
Balance as of June 30, 2020	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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