Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 13,877	$ 14,118	$ 26,998	$ 26,000
Intrastate Transportation And Storage [Member]
Revenues	765	813	1,621	1,688
Investment In Sunoco LP [Member]
Revenues	4,475	4,607	8,167	8,356
Investment In USAC [Member]
Revenues	174	167	345	167
Interstate Transportation and Storage [Member]
Revenues	493	378	991	743
Midstream [Member]
Revenues	1,198	1,874	2,916	3,488
NGL and refined products transportation and services [Member]
Revenues	2,612	2,568	5,643	5,114
Crude oil transportation and services [Member]
Revenues	5,046	4,803	9,232	8,548
Other Segments [Member]
Revenues	391	502	888	1,073
Intersegment Eliminations [Member]
Revenues	(1,277)	(1,594)	(2,805)	(3,177)
Intersegment [Member] \| Intrastate Transportation And Storage [Member]
Revenues	94	52	181	110
Intersegment [Member] \| Investment In Sunoco LP [Member]
Revenues	1	1	1	2
Intersegment [Member] \| Investment In USAC [Member]
Revenues	5	2	9	2
Intersegment [Member] \| Interstate Transportation and Storage [Member]
Revenues	6	5	12	8
Intersegment [Member] \| Midstream [Member]
Revenues	861	1,280	1,916	2,454
Intersegment [Member] \| NGL and refined products transportation and services [Member]
Revenues	256	209	574	492
Intersegment [Member] \| Crude oil transportation and services [Member]
Revenues	34	14	53	28
Intersegment [Member] \| Other Segments [Member]
Revenues	20	31	59	81
External Customers [Member] \| Intrastate Transportation And Storage [Member]
Revenues	671	761	1,440	1,578
External Customers [Member] \| Investment In Sunoco LP [Member]
Revenues	4,474	4,606	8,166	8,354
External Customers [Member] \| Investment In USAC [Member]
Revenues	169	165	336	165
External Customers [Member] \| Interstate Transportation and Storage [Member]
Revenues	487	373	979	735
External Customers [Member] \| Midstream [Member]
Revenues	337	594	1,000	1,034
External Customers [Member] \| NGL and refined products transportation and services [Member]
Revenues	2,356	2,359	5,069	4,622
External Customers [Member] \| Crude oil transportation and services [Member]
Revenues	5,012	4,789	9,179	8,520
External Customers [Member] \| Other Segments [Member]
Revenues	$ 371	$ 471	$ 829	$ 992