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Reportable Segments (Operating Segments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cost of Goods and Services Sold $ (25,487) $ (39,801) $ (41,603)
Depreciation, depletion and amortization 3,678 3,147 2,859
Equity in earnings of unconsolidated affiliates 119 302 344
Intersegment Eliminations [Member]      
Cost of Goods and Services Sold (5,829) (5,885) (6,998)
Intrastate Transportation And Storage [Member]      
Cost of Goods and Services Sold (1,478) (1,909) (2,665)
Depreciation, depletion and amortization 185 184 169
Equity in earnings of unconsolidated affiliates 18 18 19
Investment In Sunoco LP [Member]      
Cost of Goods and Services Sold (9,654) (15,380) (15,872)
Depreciation, depletion and amortization 189 181 167
Interstate Transportation and Storage [Member]      
Depreciation, depletion and amortization 411 387 334
Equity in earnings of unconsolidated affiliates 17 222 227
Midstream [Member]      
Cost of Goods and Services Sold (2,598) (3,577) (5,145)
Depreciation, depletion and amortization 1,140 1,066 1,006
Equity in earnings of unconsolidated affiliates 24 20 26
NGL and refined products transportation and services [Member]      
Cost of Goods and Services Sold (7,139) (8,393) (8,462)
Depreciation, depletion and amortization 667 613 466
Equity in earnings of unconsolidated affiliates 60 53 64
Crude oil transportation and services [Member]      
Cost of Goods and Services Sold (8,838) (14,832) (14,384)
Depreciation, depletion and amortization 640 437 445
Equity in earnings of unconsolidated affiliates (2) (1) 6
Other Segments [Member]      
Cost of Goods and Services Sold (1,527) (1,504) (2,006)
Depreciation, depletion and amortization 207 48 103
Equity in earnings of unconsolidated affiliates 2 (10) 2
Investment In USAC [Member]      
Cost of Goods and Services Sold (82) (91) (67)
Depreciation, depletion and amortization $ 239 $ 231 $ 169