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Operating Segments - Segment Financial Data (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Operating Segments    
Operating segments number | segment 3  
Revenues:    
Total revenues $ 4,111 $ 5,942
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments    
Equity earnings in unconsolidated entities 47 37
Segment profit 443 513
Maintenance capital 47 50
Transportation    
Revenues:    
Total revenues 154 185
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments    
Equity earnings in unconsolidated entities 47 37
Segment profit 247 241
Maintenance capital 35 33
Facilities    
Revenues:    
Total revenues 138 125
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments    
Segment profit 159 142
Maintenance capital 9 15
Supply and Logistics    
Revenues:    
Total revenues 3,819 5,632
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments    
Segment profit 37 130
Interest expense related to hedged inventory purchases 2 1
Maintenance capital 3 2
Operating Segments    
Revenues:    
Total revenues 4,469 6,291
Operating Segments | Transportation    
Revenues:    
Total revenues 383 400
Operating Segments | Facilities    
Revenues:    
Total revenues 265 257
Operating Segments | Supply and Logistics    
Revenues:    
Total revenues 3,821 5,634
Intersegment    
Revenues:    
Total revenues (358) (349)
Intersegment | Transportation    
Revenues:    
Total revenues (229) (215)
Intersegment | Facilities    
Revenues:    
Total revenues (127) (132)
Intersegment | Supply and Logistics    
Revenues:    
Total revenues $ (2) $ (2)