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Reportable Segments (Assets Segments) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets $ 98,880 $ 88,246 $ 86,246
Intrastate Transportation And Storage [Member]      
Assets 6,648 6,365 5,020
Interstate Transportation and Storage [Member]      
Assets 18,111 15,081 15,316
Midstream [Member]      
Assets 20,332 19,745 20,004
NGL and refined products transportation and services [Member]      
Assets 19,145 18,267 17,600
Crude oil transportation and services [Member]      
Assets 22,840 18,022 17,730
Investment In Sunoco LP [Member]      
Assets 5,438 4,879 8,344
Investment In USAC [Member]      
Assets 3,730 3,775 0
Corporate and Other [Member]      
Assets $ 2,636 $ 2,112 $ 2,232