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Reportable Segments Table - Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
[1]
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Assets $ 95,907 $ 98,973 $ 88,413
Intrastate Transportation And Storage [Member]      
Segment Reporting Information [Line Items]      
Assets 6,972 6,648  
Interstate Transportation and Storage [Member]      
Segment Reporting Information [Line Items]      
Assets 17,413 18,111  
Midstream [Member]      
Segment Reporting Information [Line Items]      
Assets 19,132 20,332  
NGL and refined products transportation and services [Member]      
Segment Reporting Information [Line Items]      
Assets 21,803 19,145  
Crude oil transportation and services [Member]      
Segment Reporting Information [Line Items]      
Assets 21,481 22,933  
Investment In Sunoco LP [Member]      
Segment Reporting Information [Line Items]      
Assets 4,985 5,438  
Investment In USAC [Member]      
Segment Reporting Information [Line Items]      
Assets 3,058 3,730  
Other Segments [Member]      
Segment Reporting Information [Line Items]      
Assets $ 1,063 $ 2,636  
[1]
*As adjusted. See Note 1.