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Estimates (Schedule Of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill				$ 4,885	$ 4,768
Goodwill acquired				307	495
Goodwill, Transfers					0
Goodwill		$ 4,885	$ 4,768	5,167	4,885
Goodwill impairment	$ (12)	(9)		(21)	(378)
Goodwill, Other Changes				(4)	0
Intrastate Transportation And Storage [Member]
Goodwill [Roll Forward]
Goodwill				10	10
Goodwill acquired				0	0
Goodwill, Transfers					0
Goodwill		10	10	10	10
Goodwill impairment				0	0
Goodwill, Other Changes				0	0
Interstate Transportation and Storage [Member]
Goodwill [Roll Forward]
Goodwill				196	196
Goodwill acquired				42	0
Goodwill, Transfers					0
Goodwill		196	196	226	196
Goodwill impairment			(262)	(12)	0
Goodwill, Other Changes				0	0
Midstream [Member]
Goodwill [Roll Forward]
Goodwill				492	870
Goodwill acquired				0	0
Goodwill, Transfers					0
Goodwill		492	870	483	492
Goodwill impairment		378		(9)	(378)
Goodwill, Other Changes				0	0
NGL and refined products transportation and services [Member]
Goodwill [Roll Forward]
Goodwill				693	693
Goodwill acquired				0	0
Goodwill, Transfers					0
Goodwill		693	693	693	693
Goodwill impairment			(79)	0	0
Goodwill, Other Changes				0	0
Crude oil transportation and services [Member]
Goodwill [Roll Forward]
Goodwill				1,167	1,167
Goodwill acquired				230	0
Goodwill, Transfers					0
Goodwill		1,167	1,167	1,397	1,167
Goodwill impairment				0	0
Goodwill, Other Changes				0	0
Investment In Sunoco LP [Member]
Goodwill [Roll Forward]
Goodwill				1,559	1,430
Goodwill acquired				0	129
Goodwill, Transfers					0
Goodwill		1,559	1,430	1,555	1,559
Goodwill impairment			(387)	0	0
Goodwill, Other Changes				(4)	0
Investment In USAC [Member]
Goodwill [Roll Forward]
Goodwill				619	0
Goodwill acquired				0	366
Goodwill, Transfers					253
Goodwill		619	0	619	619
Goodwill impairment				0	0
Goodwill, Other Changes				0	0
Other Segments [Member]
Goodwill [Roll Forward]
Goodwill				149	402
Goodwill acquired				35	0
Goodwill, Transfers					(253)
Goodwill		$ 149	402	184	149
Goodwill impairment			$ (452)	0	0
Goodwill, Other Changes				$ 0	$ 0

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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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