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Operating Segments - Segment Financial Data (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Segment Reporting Information [Line Items]        
Operating segments number | segment     3  
Revenues:        
Revenues $ 9,930 $ 3,225 $ 18,313 $ 11,494
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 33 81 121 191
Segment Adjusted EBITDA 578 523 1,124 1,316
Maintenance capital 37 54 73 104
Transportation        
Revenues:        
Revenues 162 151 299 338
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 31 81 117 189
Segment Adjusted EBITDA 433 346 821 788
Maintenance capital 20 31 47 64
Facilities        
Revenues:        
Revenues 145 149 308 323
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 2 0 4 2
Segment Adjusted EBITDA 140 174 311 384
Maintenance capital 14 15 20 29
Supply and Logistics        
Revenues:        
Revenues 9,623 2,925 17,706 10,833
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment Adjusted EBITDA 5 3 (8) 144
Maintenance capital 3 8 6 11
Operating Segments Excluding Intersegment Elimination | Transportation        
Revenues:        
Revenues 243 234 478 532
Operating Segments Excluding Intersegment Elimination | Facilities        
Revenues:        
Revenues 145 149 308 323
Operating Segments Excluding Intersegment Elimination | Supply and Logistics        
Revenues:        
Revenues 9,623 2,925 17,706 10,833
Intersegment        
Revenues:        
Revenues (490) (433) (948) (965)
Intersegment | Transportation        
Revenues:        
Revenues (310) (223) (561) (504)
Intersegment | Facilities        
Revenues:        
Revenues (99) (127) (207) (266)
Intersegment | Supply and Logistics        
Revenues:        
Revenues 0 0 (1) (1)
Intersegment Adjustment        
Revenues:        
Revenues (81) (83) (179) (194)
Operating Segments        
Revenues:        
Revenues 10,420 3,658 19,261 12,459
Operating Segments | Transportation        
Revenues:        
Revenues 553 457 1,039 1,036
Operating Segments | Facilities        
Revenues:        
Revenues 244 276 515 589
Operating Segments | Supply and Logistics        
Revenues:        
Revenues $ 9,623 $ 2,925 $ 17,707 $ 10,834