Reportable Segments Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019	[1]
Segment Reporting Information [Line Items]
Revenues	$ 7,338	$ 13,877	[1]	$ 18,965	$ 26,998
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Revenues	516	765		1,109	1,621
Intrastate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	465	671		1,001	1,440
Intrastate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	51	94		108	181
Interstate transportation and storage
Segment Reporting Information [Line Items]
Revenues	445	493		909	991
Interstate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	440	487		899	979
Interstate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	5	6		10	12
Midstream
Segment Reporting Information [Line Items]
Revenues	1,018	1,198		2,188	2,916
Midstream | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	391	337		892	1,000
Midstream | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	627	861		1,296	1,916
NGL and refined products transportation and services
Segment Reporting Information [Line Items]
Revenues	2,119	2,612		4,834	5,643
NGL and refined products transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	1,666	2,356		3,784	5,069
NGL and refined products transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	453	256		1,050	574
Crude oil transportation and services
Segment Reporting Information [Line Items]
Revenues	1,839	5,046		6,052	9,232
Crude oil transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	1,811	5,012		6,024	9,179
Crude oil transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	28	34		28	53
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Revenues	2,080	4,475		5,352	8,167
Investment In Sunoco LP [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	2,043	4,474		5,303	8,166
Investment In Sunoco LP [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	37	1		49	1
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Revenues	169	174		348	345
Investment In USAC [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	166	169		342	336
Investment In USAC [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	3	5		6	9
All other
Segment Reporting Information [Line Items]
Revenues	492	391		1,005	888
All other | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	356	371		720	829
All other | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	136	20		285	59
Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (1,340)	$ (1,277)		$ (2,832)	$ (2,805)

[1] *As adjusted. See Note 1.