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Estimates (Schedule Of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill	$ 4,768	$ 5,670
Goodwill acquired	495	12
Goodwill, Transfers	0
Goodwill	4,885	4,768	$ 5,670
Goodwill impairment	(378)	895
Goodwill, Other Changes	0	(19)
Intrastate Transportation And Storage [Member]
Goodwill [Roll Forward]
Goodwill	10	10
Goodwill acquired	0	0
Goodwill, Transfers	0
Goodwill	10	10	10
Goodwill impairment	0	0
Goodwill, Other Changes	0	0
Interstate Transportation and Storage [Member]
Goodwill [Roll Forward]
Goodwill	196	458
Goodwill acquired	0	0
Goodwill, Transfers	0
Goodwill	196	196	458
Goodwill impairment	0	262	638
Goodwill, Other Changes	0	0
Midstream [Member]
Goodwill [Roll Forward]
Goodwill	870	863
Goodwill acquired	0	8
Goodwill, Transfers	0
Goodwill	492	870	863
Goodwill impairment	(378)	0	32
Goodwill, Other Changes	0	(1)
NGL and refined products transportation and services [Member]
Goodwill [Roll Forward]
Goodwill	693	772
Goodwill acquired	0	0
Goodwill, Transfers	0
Goodwill	693	693	772
Goodwill impairment	0	79
Goodwill, Other Changes	0	0
Crude oil transportation and services [Member]
Goodwill [Roll Forward]
Goodwill	1,167	1,163
Goodwill acquired	0	4
Goodwill, Transfers	0
Goodwill	1,167	1,167	1,163
Goodwill impairment	0	0
Goodwill, Other Changes	0	0
Investment In Sunoco LP [Member]
Goodwill [Roll Forward]
Goodwill	1,430	1,550
Goodwill acquired	129	0
Goodwill, Transfers	0
Goodwill	1,559	1,430	1,550
Goodwill impairment	0	387	641
Goodwill, Other Changes	0	(18)
Investment In USAC [Member]
Goodwill [Roll Forward]
Goodwill	0	0
Goodwill acquired	366	0
Goodwill, Transfers	253
Goodwill	619	0	0
Goodwill impairment	0	0
Goodwill, Other Changes	0	0
Other Segments [Member]
Goodwill [Roll Forward]
Goodwill	402	854
Goodwill acquired	0	0
Goodwill, Transfers	(253)
Goodwill	149	402	854
Goodwill impairment	0	452
Goodwill, Other Changes	$ 0	0
Continuing Operations [Member] | Investment In Sunoco LP [Member]
Goodwill [Roll Forward]
Goodwill impairment		$ 102	$ 227

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