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Revenues - Segment Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenues $ 8,792 $ 5,873 $ 25,269 $ 18,618
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 161 160 458 459
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 149 140 437 410
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 8,482 5,573 24,374 17,749
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,315   27,093  
Total revenues 9,270 6,311 26,669 19,890
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 496   1,416  
Total revenues 498 446 1,427 1,260
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 285   845  
Total revenues 289 291 866 873
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,534   24,832  
Total revenues 8,483 5,574 24,376 17,757
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (478) (438) (1,400) (1,272)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (206) (172) (619) (503)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (140) (151) (429) (463)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues (1) $ (1) (2) $ (8)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues (45)   (424)  
Other | Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 2   11  
Other | Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 4   21  
Other | Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ (51)   $ (456)