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Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues $ 13,121 $ 11,882
Intrastate Transportation And Storage [Member]    
Revenues 856 875
Investment In Sunoco LP [Member]    
Revenues 3,692 3,749
Investment In USAC [Member]    
Revenues 171 0
Interstate Transportation and Storage [Member]    
Revenues 498 365
Midstream [Member]    
Revenues 1,718 1,614
NGL and refined products transportation and services [Member]    
Revenues 3,031 2,546
Crude oil transportation and services [Member]    
Revenues 4,186 3,745
Other Segments [Member]    
Revenues 497 571
Intersegment Eliminations [Member]    
Revenues (1,528) (1,583)
Intersegment [Member] | Intrastate Transportation And Storage [Member]    
Revenues 87 58
Intersegment [Member] | Investment In Sunoco LP [Member]    
Revenues 0 1
Intersegment [Member] | Investment In USAC [Member]    
Revenues 4 0
Intersegment [Member] | Interstate Transportation and Storage [Member]    
Revenues 6 3
Intersegment [Member] | Midstream [Member]    
Revenues 1,055 1,174
Intersegment [Member] | NGL and refined products transportation and services [Member]    
Revenues 318 283
Intersegment [Member] | Crude oil transportation and services [Member]    
Revenues 19 14
Intersegment [Member] | Other Segments [Member]    
Revenues 39 50
External Customers [Member] | Intrastate Transportation And Storage [Member]    
Revenues 769 817
External Customers [Member] | Investment In Sunoco LP [Member]    
Revenues 3,692 3,748
External Customers [Member] | Investment In USAC [Member]    
Revenues 167 0
External Customers [Member] | Interstate Transportation and Storage [Member]    
Revenues 492 362
External Customers [Member] | Midstream [Member]    
Revenues 663 440
External Customers [Member] | NGL and refined products transportation and services [Member]    
Revenues 2,713 2,263
External Customers [Member] | Crude oil transportation and services [Member]    
Revenues 4,167 3,731
External Customers [Member] | Other Segments [Member]    
Revenues $ 458 $ 521