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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
segment
Jun. 30, 2013
Operating Segments        
Operating segments number     3  
Revenues:        
Revenues $ 11,195 $ 10,295 $ 22,878 $ 20,915
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 23 11 44 23
Segment profit 488 485 1,097 1,233
Maintenance capital 48 39 95 82
Transportation
        
Revenues:        
Revenues 195 165 376 338
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 23 11 44 23
Segment profit 221 160 427 323
Maintenance capital 42 23 76 55
Facilities
        
Revenues:        
Revenues 144 197 301 420
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 134 149 288 300
Maintenance capital 5 11 15 18
Supply and Logistics
        
Revenues:        
Revenues 10,856 9,933 22,201 20,157
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 133 176 382 610
Maintenance capital 1 5 4 9
Interest expense related to hedged inventory 5 5 7 10
Operating Segments
        
Revenues:        
Revenues 11,549 10,647 23,602 21,593
Operating Segments | Transportation
        
Revenues:        
Revenues 412 365 798 732
Operating Segments | Facilities
        
Revenues:        
Revenues 277 348 576 703
Operating Segments | Supply and Logistics
        
Revenues:        
Revenues 10,860 9,934 22,228 20,158
Intersegment
        
Revenues:        
Revenues (354) (352) (724) (678)
Intersegment | Transportation
        
Revenues:        
Revenues (217) (200) (422) (394)
Intersegment | Facilities
        
Revenues:        
Revenues (133) (151) (275) (283)
Intersegment | Supply and Logistics
        
Revenues:        
Revenues $ (4) $ (1) $ (27) $ (1)