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Reportable Segments Table - Segment Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets $ 89,773 $ 88,246
Intrastate Transportation And Storage [Member]    
Assets 6,601 6,365
Investment In Sunoco LP [Member]    
Assets 5,423 4,879
Investment In USAC [Member]    
Assets 3,758 3,775
Interstate Transportation and Storage [Member]    
Assets 15,161 15,081
Midstream [Member]    
Assets 19,759 19,745
NGL and refined products transportation and services [Member]    
Assets 19,185 18,267
Crude oil transportation and services [Member]    
Assets 18,363 18,022
Other Segments [Member]    
Assets $ 1,523 $ 2,112