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Reportable Segments Table - Segment Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Assets $ 90,812 $ 88,246
Intrastate Transportation And Storage [Member]    
Assets 6,159 6,365
Investment In Sunoco LP [Member]    
Assets 5,470 4,879
Investment In USAC [Member]    
Assets 3,760 3,775
Interstate Transportation and Storage [Member]    
Assets 15,606 15,081
Midstream [Member]    
Assets 19,866 19,745
NGL and refined products transportation and services [Member]    
Assets 19,409 18,267
Crude oil transportation and services [Member]    
Assets 18,790 18,022
Other Segments [Member]    
Assets $ 1,752 $ 2,112