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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Total revenues $ 3,225 $ 8,253 $ 11,494 $ 16,628
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 151 188 338 385
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 149 151 323 307
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 2,925 7,914 10,833 15,936
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,772 8,698 12,401 17,368
Total revenues 3,658 8,765 12,459 17,642
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 453 551 1,026 1,095
Total revenues 457 559 1,036 1,115
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 264 283 569 563
Total revenues 276 291 589 589
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,055 7,864 10,806 15,710
Total revenues 2,925 7,915 10,834 15,938
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (433) (512) (965) (1,014)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (223) (243) (504) (497)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (127) (140) (266) (282)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues   (1) (1) (2)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues (114) 67 58 274
Other | Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 4 8 10 20
Other | Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 12 8 20 26
Other | Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ (130) $ 51 $ 28 $ 228