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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] $ 5,268 $ 5,630 $ 6,006
Advances to and investments in unconsolidated affiliates 3,460 2,642 2,705
Intrastate Transportation And Storage [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 124 344 175
Advances to and investments in unconsolidated affiliates 88 83 85
Interstate Transportation and Storage [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 375 812 728
Advances to and investments in unconsolidated affiliates 2,524 2,070 2,118
Midstream [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 827 1,161 1,308
Advances to and investments in unconsolidated affiliates 112 124 126
NGL and refined products transportation and services [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 2,976 2,381 2,971
Advances to and investments in unconsolidated affiliates 461 243 234
Crude oil transportation and services [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 403 474 453
Advances to and investments in unconsolidated affiliates 242 28 22
Investment In Sunoco LP [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 148 103 103
Investment In USAC [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 200 205 0
Other Segments [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] 215 150 268
Advances to and investments in unconsolidated affiliates $ 33 $ 94 $ 120
[1]
Excluding acquisitions, net of contributions in aid of construction costs (capital expenditures related to the Partnership’s proportionate ownership on an accrual basis).