Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 11,627	$ 13,121
Intrastate Transportation And Storage [Member]
Revenues	593	856
Investment In Sunoco LP [Member]
Revenues	3,272	3,692
Investment In USAC [Member]
Revenues	179	171
Interstate Transportation and Storage [Member]
Revenues	464	498
Midstream [Member]
Revenues	1,170	1,718
NGL and refined products transportation and services [Member]
Revenues	2,715	3,031
Crude oil transportation and services [Member]
Revenues	4,213	4,186
Other Segments [Member]
Revenues	513	497
Intersegment Eliminations [Member]
Revenues	(1,492)	(1,528)
Intersegment [Member] | Intrastate Transportation And Storage [Member]
Revenues	57	87
Intersegment [Member] | Investment In Sunoco LP [Member]
Revenues	12	0
Intersegment [Member] | Investment In USAC [Member]
Revenues	3	4
Intersegment [Member] | Interstate Transportation and Storage [Member]
Revenues	5	6
Intersegment [Member] | Midstream [Member]
Revenues	669	1,055
Intersegment [Member] | NGL and refined products transportation and services [Member]
Revenues	597	318
Intersegment [Member] | Crude oil transportation and services [Member]
Revenues	0	19
Intersegment [Member] | Other Segments [Member]
Revenues	149	39
External Customers [Member] | Intrastate Transportation And Storage [Member]
Revenues	536	769
External Customers [Member] | Investment In Sunoco LP [Member]
Revenues	3,260	3,692
External Customers [Member] | Investment In USAC [Member]
Revenues	176	167
External Customers [Member] | Interstate Transportation and Storage [Member]
Revenues	459	492
External Customers [Member] | Midstream [Member]
Revenues	501	663
External Customers [Member] | NGL and refined products transportation and services [Member]
Revenues	2,118	2,713
External Customers [Member] | Crude oil transportation and services [Member]
Revenues	4,213	4,167
External Customers [Member] | Other Segments [Member]
Revenues	$ 364	$ 458