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Reportable Segments (Assets Segments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets $ 95,144 $ 98,973 $ 88,413
Intrastate Transportation And Storage [Member]      
Assets 7,549 6,648 6,365
Interstate Transportation and Storage [Member]      
Assets 17,730 18,111 15,081
Midstream [Member]      
Assets 18,816 20,332 19,745
NGL and refined products transportation and services [Member]      
Assets 21,578 19,145 18,267
Crude oil transportation and services [Member]      
Assets 18,335 22,933 18,189
Investment In Sunoco LP [Member]      
Assets 5,267 5,438 4,879
Investment In USAC [Member]      
Assets 2,949 3,730 3,775
Corporate and Other [Member]      
Assets $ 2,920 $ 2,636 $ 2,112