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Revenues - Segment Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total revenues $ 8,398 $ 6,667
Transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 450  
Total revenues 253 225
Facilities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 282  
Total revenues 141 134
Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,174  
Total revenues 8,111 6,395
Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,906  
Other items in revenues (48)  
Total revenues 8,858 7,082
Operating Segments | Transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 450  
Other items in revenues 4  
Total revenues 454 389
Operating Segments | Facilities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 282  
Other items in revenues 10  
Total revenues 292 293
Operating Segments | Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,174  
Other items in revenues (62)  
Total revenues 8,112 6,400
Intersegment    
Disaggregation of Revenue [Line Items]    
Total revenues (460) (415)
Intersegment | Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues (201) (164)
Intersegment | Facilities    
Disaggregation of Revenue [Line Items]    
Total revenues (151) (159)
Intersegment | Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Total revenues $ (1) $ (5)