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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
segment
Sep. 30, 2011
Operating Segments        
Operating segments number     3  
Revenues:        
External Customers $ 9,354 $ 8,837 $ 28,358 $ 25,390
Intersegment 321 199 838 557
Total revenues of reportable segments 9,675 9,036 29,196 25,947
Equity earnings in unconsolidated entities 9 4 25 9
Segment profit 466 426 1,404 1,139
Maintenance capital 47 25 123 77
Transportation
        
Revenues:        
External Customers 150 140 458 428
Intersegment 214 160 585 436
Total revenues of reportable segments 364 300 1,043 864
Equity earnings in unconsolidated entities 9 4 25 9
Segment profit 184 152 516 416
Maintenance capital 26 17 78 52
Facilities
        
Revenues:        
External Customers 156 153 533 396
Intersegment 106 38 252 120
Total revenues of reportable segments 262 191 785 516
Segment profit 140 95 344 259
Maintenance capital 17 6 34 16
Supply and Logistics
        
Revenues:        
External Customers 9,048 8,544 27,367 24,566
Intersegment 1 1 1 1
Total revenues of reportable segments 9,049 8,545 27,368 24,567
Segment profit 142 179 544 464
Maintenance capital 4 2 11 9
Interest expense related to hedged inventory purchases $ 3 $ 6 $ 9 $ 17