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Reportable Segments (Operating Segments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost of Goods and Services Sold $ 39,727 $ 41,658 $ 30,966
Depreciation, depletion and amortization 3,147 2,859 2,554
Equity in earnings of unconsolidated affiliates 302 344 144
Intrastate Transportation And Storage [Member]      
Cost of Goods and Services Sold 1,909 2,665 2,327
Depreciation, depletion and amortization 184 169 147
Equity in earnings of unconsolidated affiliates 18 19 (156)
Investment In Sunoco LP [Member]      
Cost of Goods and Services Sold 15,380 15,872 10,615
Depreciation, depletion and amortization 181 167 169
Interstate Transportation and Storage [Member]      
Depreciation, depletion and amortization 387 334 254
Equity in earnings of unconsolidated affiliates 222 227 236
Midstream [Member]      
Cost of Goods and Services Sold 3,577 5,145 4,761
Depreciation, depletion and amortization 1,066 1,006 954
Equity in earnings of unconsolidated affiliates 20 26 20
NGL and refined products transportation and services [Member]      
Cost of Goods and Services Sold 8,393 8,462 6,508
Depreciation, depletion and amortization 613 466 401
Equity in earnings of unconsolidated affiliates 53 64 33
Crude oil transportation and services [Member]      
Cost of Goods and Services Sold 14,758 14,439 9,826
Depreciation, depletion and amortization 437 445 402
Equity in earnings of unconsolidated affiliates (1) 6 4
Other Segments [Member]      
Cost of Goods and Services Sold 1,504 2,006 2,509
Depreciation, depletion and amortization 48 103 227
Equity in earnings of unconsolidated affiliates (10) 2 7
Investment In USAC [Member]      
Cost of Goods and Services Sold 91 67 0
Depreciation, depletion and amortization 231 169 0
Intersegment Eliminations [Member]      
Cost of Goods and Services Sold $ (5,885) $ (6,998) $ (5,580)