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Reportable Segments Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from External Customer [Line Items]                      
Revenues $ 13,720 $ 13,495 $ 13,877 $ 13,121 $ 13,573 $ 14,514 $ 14,118 $ 11,882 $ 54,213 $ 54,087 $ 40,523
Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 698 508 0
Intersegment Eliminations [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (5,951) (7,039) (5,609)
Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 1,689 2,228 2,901
Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 18,447 17,332 11,703
NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 11,641 11,123 8,648
Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 6,031 7,522 6,943
Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 1,963 1,682 1,131
Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 3,099 3,737 3,083
Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 16,596 16,994 11,723
Intersegment [Member] | Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 20 13 0
Intersegment [Member] | Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 81 155 161
Intersegment [Member] | Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 0 96 31
Intersegment [Member] | NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 1,721 1,004 763
Intersegment [Member] | Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 3,751 5,432 4,433
Intersegment [Member] | Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 22 18 19
Intersegment [Member] | Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 350 309 192
Intersegment [Member] | Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 6 12 10
External Customers [Member] | Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 678 495 0
External Customers [Member] | Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 1,608 2,073 2,740
External Customers [Member] | Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 18,447 17,236 11,672
External Customers [Member] | NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 9,920 10,119 7,885
External Customers [Member] | Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 2,280 2,090 2,510
External Customers [Member] | Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 1,941 1,664 1,112
External Customers [Member] | Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 2,749 3,428 2,891
External Customers [Member] | Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 $ 16,590 $ 16,982 $ 11,713