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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions $ 5,630 $ 6,006 $ 5,929
Advances to and investments in unconsolidated affiliates 2,642 2,705 3,040
Intrastate Transportation And Storage [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 344 175 76
Advances to and investments in unconsolidated affiliates 83 85 387
Interstate Transportation and Storage [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 812 728 280
Advances to and investments in unconsolidated affiliates 2,070 2,118 2,149
Midstream [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 1,161 1,308 1,255
Advances to and investments in unconsolidated affiliates 124 126 111
NGL and refined products transportation and services [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 2,381 2,971 2,198
Advances to and investments in unconsolidated affiliates 243 234 235
Crude oil transportation and services [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 474 453 1,841
Advances to and investments in unconsolidated affiliates 28 22 18
Investment In Sunoco LP [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 103 103 119
Investment In USAC [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 205 0 0
Other Segments [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions 150 268 160
Advances to and investments in unconsolidated affiliates $ 94 $ 120 $ 140