Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ (16,664)	$ (9,955)	$ (48,760)	$ (28,920)
Intersegment Eliminations [Member]
Revenues	3,364	1,353	(9,617)	(4,160)
Intrastate Transportation And Storage [Member]
Revenues	(1,217)	(654)	(7,066)	(1,763)
Investment In Sunoco LP [Member]
Revenues	(4,779)	(2,805)	(12,642)	(8,157)
Investment In USAC [Member]
Revenues	(159)	(161)	(473)	(509)
Interstate Transportation and Storage [Member]
Revenues	(418)	(471)	(1,350)	(1,380)
Midstream [Member]
Revenues	(2,919)	(1,377)	(7,790)	(3,565)
NGL and refined products transportation and services [Member]
Revenues	(5,262)	(2,623)	(13,774)	(7,457)
Crude oil transportation and services [Member]
Revenues	(4,578)	(2,850)	(12,498)	(8,877)
Other Segments [Member]
Revenues	(696)	(367)	(2,784)	(1,372)
Intersegment [Member] \| Intrastate Transportation And Storage [Member]
Revenues	(105)	(40)	(1,126)	(148)
Intersegment [Member] \| Investment In Sunoco LP [Member]
Revenues	(7)	(4)	(16)	(53)
Intersegment [Member] \| Investment In USAC [Member]
Revenues	(3)	(3)	(9)	(9)
Intersegment [Member] \| Interstate Transportation and Storage [Member]
Revenues	(6)	(5)	(33)	(15)
Intersegment [Member] \| Midstream [Member]
Revenues	(2,359)	(792)	(6,081)	(2,088)
Intersegment [Member] \| NGL and refined products transportation and services [Member]
Revenues	(763)	(416)	(2,048)	(1,466)
Intersegment [Member] \| Crude oil transportation and services [Member]
Revenues	(1)	(1)	(1)	(4)
Intersegment [Member] \| Other Segments [Member]
Revenues	(120)	(92)	(303)	(377)
External Customers [Member] \| Intrastate Transportation And Storage [Member]
Revenues	(1,112)	(614)	(5,940)	(1,615)
External Customers [Member] \| Investment In Sunoco LP [Member]
Revenues	(4,772)	(2,801)	(12,626)	(8,104)
External Customers [Member] \| Investment In USAC [Member]
Revenues	(156)	(158)	(464)	(500)
External Customers [Member] \| Interstate Transportation and Storage [Member]
Revenues	(412)	(466)	(1,317)	(1,365)
External Customers [Member] \| Midstream [Member]
Revenues	(560)	(585)	(1,709)	(1,477)
External Customers [Member] \| NGL and refined products transportation and services [Member]
Revenues	(4,499)	(2,207)	(11,726)	(5,991)
External Customers [Member] \| Crude oil transportation and services [Member]
Revenues	(4,577)	(2,849)	(12,497)	(8,873)
External Customers [Member] \| Other Segments [Member]
Revenues	$ (576)	$ (275)	$ (2,481)	$ (995)