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Reportable Segments Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from External Customer [Line Items]                      
Revenues $ (10,034) $ (9,955) $ (7,338) $ (11,627) $ (13,720) $ (13,495) $ (13,877) $ (13,121) $ (38,954) $ (54,213) $ (54,087)
Intersegment Eliminations [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (5,884) (5,951) (7,039)
Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (667) (698) (508)
Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (1,838) (1,689) (2,228)
Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (11,679) (18,447) (17,332)
NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (10,513) (11,641) (11,123)
Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (5,026) (6,031) (7,522)
Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (1,861) (1,963) (1,682)
Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (2,544) (3,099) (3,737)
Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (10,710) (16,596) (16,994)
Intersegment [Member] | Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (12) (20) (13)
Intersegment [Member] | Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (464) (81) (155)
Intersegment [Member] | Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (5) 0 (96)
Intersegment [Member] | NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (2,012) (1,721) (1,004)
Intersegment [Member] | Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (3,082) (3,751) (5,432)
Intersegment [Member] | Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (20) (22) (18)
Intersegment [Member] | Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (232) (350) (309)
Intersegment [Member] | Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (57) (6) (12)
External Customers [Member] | Investment In USAC [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (655) (678) (495)
External Customers [Member] | Other Segments [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (1,374) (1,608) (2,073)
External Customers [Member] | Crude oil transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (11,674) (18,447) (17,236)
External Customers [Member] | NGL and refined products transportation and services [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (8,501) (9,920) (10,119)
External Customers [Member] | Midstream [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (1,944) (2,280) (2,090)
External Customers [Member] | Interstate Transportation and Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (1,841) (1,941) (1,664)
External Customers [Member] | Intrastate Transportation And Storage [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 (2,312) (2,749) (3,428)
External Customers [Member] | Investment In Sunoco LP [Member]                      
Revenue from External Customer [Line Items]                      
Revenues                 $ (10,653) $ (16,590) $ (16,982)