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Reportable Segments (Assets Segments)(Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets $ 86,246 $ 78,925 [1] $ 71,144
Investment In ETP [Member]      
Assets 77,965 70,105 65,128
Investment In Sunoco LP [Member]      
Assets 8,344 8,701 8,842
Investment in Lake Charles LNG [Member]      
Assets 1,646 1,508 1,369
Corporate and Other [Member]      
Assets 598 711 638
Adjustments and Eliminations [Member]      
Assets $ (2,307) $ (2,100) $ (4,833)
[1] * As adjusted. See Note 2.