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Goodwill and Intangibles (Reconciliation of Goodwill) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Gross goodwill	$ 2,716,000,000		$ 2,375,000,000
Accumulated impairment losses	(130,000,000)		(130,000,000)
Goodwill, beginning balance	2,245,000,000	$ 2,245,000,000
Impairment losses	0	0
Acquisitions	341,000,000	0
Goodwill, ending balance	2,586,000,000	2,245,000,000
Logistics and Storage [Member]
Goodwill [Line Items]
Gross goodwill	503,000,000		162,000,000
Accumulated impairment losses	0		0
Goodwill, beginning balance	162,000,000	162,000,000
Impairment losses	0	0
Acquisitions	341,000,000	0
Goodwill, ending balance	503,000,000	162,000,000
Gathering and Processing [Member]
Goodwill [Line Items]
Gross goodwill	2,213,000,000		2,213,000,000
Accumulated impairment losses	(130,000,000)		$ (130,000,000)
Goodwill, beginning balance	2,083,000,000	2,083,000,000
Impairment losses	0	0
Acquisitions	0	0
Goodwill, ending balance	$ 2,083,000,000	$ 2,083,000,000

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