Reportable Segments Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 9,955	$ 13,495	[1]	$ 28,920	$ 40,493	[1]
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Revenues	654	764		1,763	2,385	[1]
Intrastate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	614	675		1,615	2,115
Intrastate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	40	89		148	270
Interstate transportation and storage
Segment Reporting Information [Line Items]
Revenues	471	479		1,380	1,470	[1]
Interstate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	466	475		1,365	1,454
Interstate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	5	4		15	16
Midstream
Segment Reporting Information [Line Items]
Revenues	1,377	1,580		3,565	4,496	[1]
Midstream | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	585	704		1,477	1,704
Midstream | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	792	876		2,088	2,792
NGL and refined products transportation and services
Segment Reporting Information [Line Items]
Revenues	2,623	2,878		7,457	8,521	[1]
NGL and refined products transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	2,207	2,271		5,991	7,340
NGL and refined products transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	416	607		1,466	1,181
Crude oil transportation and services
Segment Reporting Information [Line Items]
Revenues	2,850	4,453		8,877	13,685	[1]
Crude oil transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	2,849	4,453		8,873	13,685
Crude oil transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	1	0		4	0
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Revenues	2,805	4,331		8,157	12,498	[1]
Investment In Sunoco LP [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	2,801	4,328		8,104	12,494
Investment In Sunoco LP [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	4	3		53	4
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Revenues	161	175		509	520	[1]
Investment In USAC [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	158	169		500	505
Investment In USAC [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	3	6		9	15
All other
Segment Reporting Information [Line Items]
Revenues	367	441		1,372	1,276	[1]
All other | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	275	420		995	1,196
All other | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	92	21		377	80
Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (1,353)	$ (1,606)		$ (4,160)	$ (4,358)	[1]

[1] *As adjusted. See Note 1.