Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ (15,101)	$ (7,338)	$ (32,096)	$ (18,965)
Intersegment Eliminations [Member]
Revenues	2,520	1,315	(6,253)	(2,807)
Intrastate Transportation And Storage [Member]
Revenues	(949)	(516)	(5,849)	(1,109)
Investment In Sunoco LP [Member]
Revenues	(4,392)	(2,080)	(7,863)	(5,352)
Investment In USAC [Member]
Revenues	(156)	(169)	(314)	(348)
Interstate Transportation and Storage [Member]
Revenues	(407)	(445)	(932)	(909)
Midstream [Member]
Revenues	(2,199)	(1,018)	(4,871)	(2,188)
NGL and refined products transportation and services [Member]
Revenues	(4,522)	(2,119)	(8,512)	(4,834)
Crude oil transportation and services [Member]
Revenues	(4,420)	(1,814)	(7,920)	(6,027)
Other Segments [Member]
Revenues	(576)	(492)	(2,088)	(1,005)
Intersegment [Member] \| Intrastate Transportation And Storage [Member]
Revenues	(97)	(51)	(1,021)	(108)
Intersegment [Member] \| Investment In Sunoco LP [Member]
Revenues	(7)	(37)	(9)	(49)
Intersegment [Member] \| Investment In USAC [Member]
Revenues	(3)	(3)	(6)	(6)
Intersegment [Member] \| Interstate Transportation and Storage [Member]
Revenues	(3)	(5)	(27)	(10)
Intersegment [Member] \| Midstream [Member]
Revenues	(1,628)	(627)	(3,722)	(1,296)
Intersegment [Member] \| NGL and refined products transportation and services [Member]
Revenues	(692)	(453)	(1,285)	(1,050)
Intersegment [Member] \| Crude oil transportation and services [Member]
Revenues	0	(3)	0	(3)
Intersegment [Member] \| Other Segments [Member]
Revenues	(90)	(136)	(183)	(285)
External Customers [Member] \| Intrastate Transportation And Storage [Member]
Revenues	(852)	(465)	(4,828)	(1,001)
External Customers [Member] \| Investment In Sunoco LP [Member]
Revenues	(4,385)	(2,043)	(7,854)	(5,303)
External Customers [Member] \| Investment In USAC [Member]
Revenues	(153)	(166)	(308)	(342)
External Customers [Member] \| Interstate Transportation and Storage [Member]
Revenues	(404)	(440)	(905)	(899)
External Customers [Member] \| Midstream [Member]
Revenues	(571)	(391)	(1,149)	(892)
External Customers [Member] \| NGL and refined products transportation and services [Member]
Revenues	(3,830)	(1,666)	(7,227)	(3,784)
External Customers [Member] \| Crude oil transportation and services [Member]
Revenues	(4,420)	(1,811)	(7,920)	(6,024)
External Customers [Member] \| Other Segments [Member]
Revenues	$ (486)	$ (356)	$ (1,905)	$ (720)