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Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ (16,995) $ (11,627)
Intersegment Eliminations [Member]    
Revenues (3,733) (1,492)
Intrastate Transportation And Storage [Member]    
Revenues (4,900) (593)
Investment In Sunoco LP [Member]    
Revenues (3,471) (3,272)
Investment In USAC [Member]    
Revenues (158) (179)
Interstate Transportation and Storage [Member]    
Revenues (525) (464)
Midstream [Member]    
Revenues (2,672) (1,170)
NGL and refined products transportation and services [Member]    
Revenues (3,990) (2,715)
Crude oil transportation and services [Member]    
Revenues (3,500) (4,213)
Other Segments [Member]    
Revenues (1,512) (513)
Intersegment [Member] | Intrastate Transportation And Storage [Member]    
Revenues (924) (57)
Intersegment [Member] | Investment In Sunoco LP [Member]    
Revenues (2) (12)
Intersegment [Member] | Investment In USAC [Member]    
Revenues (3) (3)
Intersegment [Member] | Interstate Transportation and Storage [Member]    
Revenues (24) (5)
Intersegment [Member] | Midstream [Member]    
Revenues (2,094) (669)
Intersegment [Member] | NGL and refined products transportation and services [Member]    
Revenues (593) (597)
Intersegment [Member] | Crude oil transportation and services [Member]    
Revenues 0 0
Intersegment [Member] | Other Segments [Member]    
Revenues (93) (149)
External Customers [Member] | Intrastate Transportation And Storage [Member]    
Revenues (3,976) (536)
External Customers [Member] | Investment In Sunoco LP [Member]    
Revenues (3,469) (3,260)
External Customers [Member] | Investment In USAC [Member]    
Revenues (155) (176)
External Customers [Member] | Interstate Transportation and Storage [Member]    
Revenues (501) (459)
External Customers [Member] | Midstream [Member]    
Revenues (578) (501)
External Customers [Member] | NGL and refined products transportation and services [Member]    
Revenues (3,397) (2,118)
External Customers [Member] | Crude oil transportation and services [Member]    
Revenues (3,500) (4,213)
External Customers [Member] | Other Segments [Member]    
Revenues $ (1,419) $ (364)