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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Advances to and investments in unconsolidated affiliates $ 2,705 $ 3,040 [1] $ 3,462
Investment In ETP [Member]      
Segment Reporting Information [Line Items]      
Advances to and investments in unconsolidated affiliates 3,816 4,280 5,003
Adjustments and Eliminations [Member]      
Segment Reporting Information [Line Items]      
Advances to and investments in unconsolidated affiliates $ (1,111) $ (1,240) $ (1,541)
[1] * As adjusted. See Note 2.