Reportable Segments Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 11,568	$ 13,121	[1]
Intrastate transportation and storage
Segment Reporting Information [Line Items]
Revenues	593	856
Intrastate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	536	769
Intrastate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	57	87
Interstate transportation and storage
Segment Reporting Information [Line Items]
Revenues	464	498
Interstate transportation and storage | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	459	492
Interstate transportation and storage | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	5	6
Midstream
Segment Reporting Information [Line Items]
Revenues	1,170	1,718
Midstream | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	501	663
Midstream | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	669	1,055
NGL and refined products transportation and services
Segment Reporting Information [Line Items]
Revenues	2,715	3,031
NGL and refined products transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	2,118	2,713
NGL and refined products transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	597	318
Crude oil transportation and services
Segment Reporting Information [Line Items]
Revenues	4,213	4,186
Crude oil transportation and services | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	4,213	4,167
Crude oil transportation and services | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	0	19
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Revenues	3,272	3,692
Investment In Sunoco LP [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	3,260	3,692
Investment In Sunoco LP [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	12	0
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Revenues	179	171
Investment In USAC [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	176	167
Investment In USAC [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	3	4
All other
Segment Reporting Information [Line Items]
Revenues	454	497
All other | External Customers [Member]
Segment Reporting Information [Line Items]
Revenues	305	458
All other | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	149	39
Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (1,492)	$ (1,528)

[1] *As adjusted. See Note 1.