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Operating Segments - Segment Financial Data (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]          
Operating segments number | segment     3    
Revenues:          
Revenues $ 3,225 $ 8,253 $ 11,494 $ 16,628  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments          
Equity earnings in unconsolidated entities 81 83 191 172  
Segment Adjusted EBITDA 523 782 1,316 1,643  
Maintenance capital 54 72 104 118  
Total assets 24,037   24,037   $ 28,677
Transportation          
Revenues:          
Revenues 151 188 338 385  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments          
Equity earnings in unconsolidated entities 81 83 189 172  
Segment Adjusted EBITDA 346 410 788 809  
Maintenance capital 31 39 64 67  
Total assets 13,815   13,815   14,902
Facilities          
Revenues:          
Revenues 149 151 323 307  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments          
Equity earnings in unconsolidated entities     2    
Segment Adjusted EBITDA 174 172 384 356  
Maintenance capital 15 30 29 46  
Total assets 5,995   5,995   7,336
Supply and Logistics          
Revenues:          
Revenues 2,925 7,914 10,833 15,936  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments          
Segment Adjusted EBITDA 3 200 144 478  
Maintenance capital 8 3 11 5  
Total assets 4,227   4,227   $ 6,439
Operating Segments Excluding Intersegment Elimination | Transportation          
Revenues:          
Revenues 234 316 532 618  
Operating Segments Excluding Intersegment Elimination | Facilities          
Revenues:          
Revenues 149 151 323 307  
Operating Segments Excluding Intersegment Elimination | Supply and Logistics          
Revenues:          
Revenues 2,925 7,914 10,833 15,936  
Intersegment          
Revenues:          
Revenues (433) (512) (965) (1,014)  
Intersegment | Transportation          
Revenues:          
Revenues (223) (243) (504) (497)  
Intersegment | Facilities          
Revenues:          
Revenues (127) (140) (266) (282)  
Intersegment | Supply and Logistics          
Revenues:          
Revenues   (1) (1) (2)  
Intersegment Adjustment          
Revenues:          
Revenues (83) (128) (194) (233)  
Operating Segments          
Revenues:          
Revenues 3,658 8,765 12,459 17,642  
Operating Segments | Transportation          
Revenues:          
Revenues 457 559 1,036 1,115  
Operating Segments | Facilities          
Revenues:          
Revenues 276 291 589 589  
Operating Segments | Supply and Logistics          
Revenues:          
Revenues $ 2,925 $ 7,915 $ 10,834 $ 15,938