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Estimates (Schedule Of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill			$ 5,167			$ 5,167	$ 4,885
Goodwill acquired						9	307
Goodwill	$ 2,391			$ 5,167		2,391	5,167
Goodwill impairment				(9)	$ (12)	(2,815)	(21)
Goodwill, Other Changes						30	(4)
Intrastate Transportation And Storage [Member]
Goodwill [Roll Forward]
Goodwill			10			10	10
Goodwill acquired						0	0
Goodwill	0			10		0	10
Goodwill impairment	(10)					(10)	0
Goodwill, Other Changes						0	0
Interstate Transportation and Storage [Member]
Goodwill [Roll Forward]
Goodwill			226			226	196
Goodwill acquired						0	42
Goodwill	0			226		0	226
Goodwill impairment		$ (43)	(183)			(226)	(12)
Goodwill, Other Changes						0	0
Midstream [Member]
Goodwill [Roll Forward]
Goodwill			483			483	492
Goodwill acquired						0	0
Goodwill	0			483		0	483
Goodwill impairment			(483)	(378)		(483)	(9)
Goodwill, Other Changes						0	0
NGL and refined products transportation and services [Member]
Goodwill [Roll Forward]
Goodwill			693			693	693
Goodwill acquired						0	0
Goodwill	693			693		693	693
Goodwill impairment						0	0
Goodwill, Other Changes						0	0
Crude oil transportation and services [Member]
Goodwill [Roll Forward]
Goodwill			1,397			1,397	1,167
Goodwill acquired						0	230
Goodwill	52			1,397		52	1,397
Goodwill impairment		(1,280)				(1,279)	0
Goodwill, Other Changes						(66)	0
Investment In Sunoco LP [Member]
Goodwill [Roll Forward]
Goodwill			1,555			1,555	1,559
Goodwill acquired						9	0
Goodwill	1,564			1,555		1,564	1,555
Goodwill impairment						0	0
Goodwill, Other Changes						0	(4)
Investment In USAC [Member]
Goodwill [Roll Forward]
Goodwill			619			619	619
Goodwill acquired						0	0
Goodwill	0			619		0	619
Goodwill impairment			(619)			(619)	0
Goodwill, Other Changes						0	0
Other Segments [Member]
Goodwill [Roll Forward]
Goodwill			184			184	149
Goodwill acquired						0	35
Goodwill	82			$ 184		82	184
Goodwill impairment	$ (15)	$ (132)	$ (40)			(198)	0
Goodwill, Other Changes						$ 96	$ 0

X

- Definition

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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