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Reportable Segments (Assets Segments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets $ 88,246 $ 86,246 $ 78,925
Intrastate Transportation And Storage [Member]      
Assets 6,365 5,020 5,174
Interstate Transportation and Storage [Member]      
Assets 15,081 15,316 12,492
Midstream [Member]      
Assets 19,745 20,004 17,873
NGL and refined products transportation and services [Member]      
Assets 19,227 17,600 14,074
Crude oil transportation and services [Member]      
Assets 17,062 17,730 15,908
Investment In Sunoco LP [Member]      
Assets 4,879 8,344 8,701
Investment In USAC [Member]      
Assets 3,775 0 0
Corporate and Other [Member]      
Assets $ 2,112 $ 2,232 $ 4,703