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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
segment
Mar. 31, 2011
Operating Segments    
Number of Operating Segments 3  
Revenues:    
External Customers $ 9,218 $ 7,694
Intersegment 212 177
Total revenues of reportable segments 9,430 7,871
Equity earnings in unconsolidated entities 7  
Segment profit 380 348
Maintenance capital 35 24
Transportation
    
Revenues:    
External Customers 150 141
Intersegment 167 134
Total revenues of reportable segments 317 275
Equity earnings in unconsolidated entities 7  
Segment profit 162 137
Maintenance capital 24 18
Facilities
    
Revenues:    
External Customers 191 118
Intersegment 45 43
Total revenues of reportable segments 236 161
Segment profit 90 78
Maintenance capital 7 3
Supply and Logistics
    
Revenues:    
External Customers 8,877 7,435
Total revenues of reportable segments 8,877 7,435
Segment profit 128 133
Maintenance capital 4 3
Interest expense related to hedged inventory purchases $ 2 $ 5