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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	$ 3,759	$ 5,268	$ 5,630
Advances to and investments in unconsolidated affiliates		3,060	3,460	2,642
Intrastate Transportation And Storage [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	49	124	344
Advances to and investments in unconsolidated affiliates		89	88	83
Interstate Transportation and Storage [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	150	375	812
Advances to and investments in unconsolidated affiliates		2,278	2,524	2,070
Midstream [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	487	827	1,161
Advances to and investments in unconsolidated affiliates		110	112	124
NGL and refined products transportation and services [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	2,403	2,976	2,381
Advances to and investments in unconsolidated affiliates		509	461	243
Crude oil transportation and services [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	291	403	474
Advances to and investments in unconsolidated affiliates		22	242	28
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	124	148	103
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	119	200	205
Other Segments [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	[1]	136	215	150
Advances to and investments in unconsolidated affiliates		$ 52	$ 33	$ 94
[1] Excluding acquisitions, net of contributions in aid of construction costs (capital expenditures related to the Partnership’s proportionate ownership on an accrual basis).

X

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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X

- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

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+ References

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