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Revenues - Segment Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenues $ 8,080 $ 6,078 $ 16,478 $ 12,745
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 152 161 298 299
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 147 136 288 270
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 7,781 5,781 15,892 12,176
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,872   17,778  
Total revenues 8,540 6,497 17,398 13,580
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 470   920  
Total revenues 475 425 929 814
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 278   560  
Total revenues 284 289 576 582
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,124   16,298  
Total revenues 7,781 5,783 15,893 12,184
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (460) (419) (920) (835)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (211) (167) (412) (331)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (137) (153) (288) (312)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues   $ (2) (1) $ (8)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues (332)   (380)  
Other | Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 5   9  
Other | Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 6   16  
Other | Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ (343)   $ (405)