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Reportable Segments Table - Revenues (External and Intersegment) by Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues $ 7,338 $ 13,877 [1] $ 18,965 $ 26,998 [1]
Intrastate Transportation And Storage [Member]        
Revenues 516 765 1,109 1,621
Investment In Sunoco LP [Member]        
Revenues 2,080 4,475 5,352 8,167
Investment In USAC [Member]        
Revenues 169 174 348 345
Interstate Transportation and Storage [Member]        
Revenues 445 493 909 991
Midstream [Member]        
Revenues 1,018 1,198 2,188 2,916
NGL and refined products transportation and services [Member]        
Revenues 2,119 2,612 4,834 5,643
Crude oil transportation and services [Member]        
Revenues 1,839 5,046 6,052 9,232
Other Segments [Member]        
Revenues 492 391 1,005 888
Intersegment Eliminations [Member]        
Revenues (1,340) (1,277) (2,832) (2,805)
Intersegment [Member] | Intrastate Transportation And Storage [Member]        
Revenues 51 94 108 181
Intersegment [Member] | Investment In Sunoco LP [Member]        
Revenues 37 1 49 1
Intersegment [Member] | Investment In USAC [Member]        
Revenues 3 5 6 9
Intersegment [Member] | Interstate Transportation and Storage [Member]        
Revenues 5 6 10 12
Intersegment [Member] | Midstream [Member]        
Revenues 627 861 1,296 1,916
Intersegment [Member] | NGL and refined products transportation and services [Member]        
Revenues 453 256 1,050 574
Intersegment [Member] | Crude oil transportation and services [Member]        
Revenues 28 34 28 53
Intersegment [Member] | Other Segments [Member]        
Revenues 136 20 285 59
External Customers [Member] | Intrastate Transportation And Storage [Member]        
Revenues 465 671 1,001 1,440
External Customers [Member] | Investment In Sunoco LP [Member]        
Revenues 2,043 4,474 5,303 8,166
External Customers [Member] | Investment In USAC [Member]        
Revenues 166 169 342 336
External Customers [Member] | Interstate Transportation and Storage [Member]        
Revenues 440 487 899 979
External Customers [Member] | Midstream [Member]        
Revenues 391 337 892 1,000
External Customers [Member] | NGL and refined products transportation and services [Member]        
Revenues 1,666 2,356 3,784 5,069
External Customers [Member] | Crude oil transportation and services [Member]        
Revenues 1,811 5,012 6,024 9,179
External Customers [Member] | Other Segments [Member]        
Revenues $ 356 $ 371 $ 720 $ 829
[1]
*As adjusted. See Note 1.