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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
segment
Jun. 30, 2012
Operating Segments        
Operating segments number     3  
Revenues:        
External Customers $ 10,295 $ 9,786 $ 20,915 $ 19,004
Intersegment 352 304 678 516
Total revenues of reportable segments 10,647 10,090 21,593 19,520
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 11 9 23 16
Segment profit 485 557 1,233 938
Maintenance capital 39 40 82 76
Transportation
        
Revenues:        
External Customers 165 158 338 307
Intersegment 200 203 394 371
Total revenues of reportable segments 365 361 732 678
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 11 9 23 16
Segment profit 160 169 323 332
Maintenance capital 23 27 55 52
Facilities
        
Revenues:        
External Customers 197 186 420 378
Intersegment 151 101 283 145
Total revenues of reportable segments 348 287 703 523
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 149 114 300 204
Maintenance capital 11 10 18 17
Supply and Logistics
        
Revenues:        
External Customers 9,933 9,442 20,157 18,319
Intersegment 1   1  
Total revenues of reportable segments 9,934 9,442 20,158 18,319
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 176 274 610 402
Maintenance capital 5 3 9 7
Interest expense related to hedged inventory $ 5 $ 4 $ 10 $ 6