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Reportable Segments (Operating Segments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost of Goods and Services Sold $ 41,658 $ 30,966 $ 23,693
Depreciation, depletion and amortization 2,859 2,554 2,216
Equity in earnings of unconsolidated affiliates 344 144 270
Intrastate Transportation And Storage [Member]      
Cost of Goods and Services Sold 2,665 2,327 1,897
Depreciation, depletion and amortization 169 147 144
Equity in earnings of unconsolidated affiliates 19 (156) 35
Investment In Sunoco LP [Member]      
Cost of Goods and Services Sold 15,872 10,615 8,830
Depreciation, depletion and amortization 167 169 176
Interstate Transportation and Storage [Member]      
Depreciation, depletion and amortization 334 254 246
Equity in earnings of unconsolidated affiliates 227 236 193
Midstream [Member]      
Cost of Goods and Services Sold 5,145 4,761 3,381
Depreciation, depletion and amortization 1,006 954 840
Equity in earnings of unconsolidated affiliates 26 20 19
NGL and refined products transportation and services [Member]      
Cost of Goods and Services Sold 8,462 6,508 4,553
Depreciation, depletion and amortization 466 401 355
Equity in earnings of unconsolidated affiliates 64 33 41
Crude oil transportation and services [Member]      
Cost of Goods and Services Sold 14,439 9,826 6,416
Depreciation, depletion and amortization 445 402 251
Equity in earnings of unconsolidated affiliates 6 4 (4)
Other Segments [Member]      
Cost of Goods and Services Sold 2,006 2,509 2,942
Depreciation, depletion and amortization 103 227 204
Equity in earnings of unconsolidated affiliates 2 7 (14)
Investment In USAC [Member]      
Cost of Goods and Services Sold 67 0 0
Depreciation, depletion and amortization 169 0 0
Intersegment Eliminations [Member]      
Cost of Goods and Services Sold $ (6,998) $ (5,580) $ (4,326)