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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, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill			$ 5,167			$ 2,391	$ 5,167
Goodwill						142	9
Goodwill	$ 2,391			$ 5,167		2,533	2,391
Goodwill impairment				(9)	$ (12)		(2,815)
Goodwill, Other Changes							30
Intrastate Transportation and Storage
Goodwill [Roll Forward]
Goodwill			10			0	10
Goodwill						0	0
Goodwill	0			10		0	0
Goodwill impairment	(10)						(10)
Goodwill, Other Changes							0
Interstate Transportation and Storage
Goodwill [Roll Forward]
Goodwill			226			0	226
Goodwill						0	0
Goodwill	0			226		0	0
Goodwill impairment		$ (43)	(183)				(226)
Goodwill, Other Changes							0
Midstream
Goodwill [Roll Forward]
Goodwill			483			0	483
Goodwill						0	0
Goodwill	0			483		0	0
Goodwill impairment			(483)				(483)
Goodwill, Other Changes							0
NGL and Refined Products Transportation and Services
Goodwill [Roll Forward]
Goodwill			693			693	693
Goodwill						0	0
Goodwill	693			693		693	693
Goodwill impairment							0
Goodwill, Other Changes							0
Crude Oil Transportation and Services
Goodwill [Roll Forward]
Goodwill			1,397			52	1,397
Goodwill						138	0
Goodwill	52			1,397		190	52
Goodwill impairment		(1,280)					(1,279)
Goodwill, Other Changes							(66)
Investment in Sunoco LP
Goodwill [Roll Forward]
Goodwill			1,555			1,564	1,555
Goodwill						4	9
Goodwill	1,564			1,555		1,568	1,564
Goodwill impairment							0
Goodwill, Other Changes							0
Investment in USAC
Goodwill [Roll Forward]
Goodwill			619			0	619
Goodwill						0	0
Goodwill	0			619		0	0
Goodwill impairment			(619)				(619)
Goodwill, Other Changes							0
All Other
Goodwill [Roll Forward]
Goodwill			184			82	184
Goodwill						0	0
Goodwill	82			$ 184		$ 82	82
Goodwill impairment	$ (15)	$ (132)	$ (40)				(198)
Goodwill, Other Changes							$ 96

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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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