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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Operating Segments                      
Operating segments number                 3    
Revenues:                      
External Customers $ 9,439 $ 9,354 $ 9,786 $ 9,218 $ 8,884 $ 8,837 $ 8,859 $ 7,694 $ 37,797 $ 34,275 $ 25,893
Intersegment                 1,157 754 632
Total revenues of reportable segments                 38,954 35,029 26,525
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 38 13 3
Segment profit                 1,945 1,560 1,026
Capital expenditures                 3,471 1,935 762
Total assets 19,235       15,381       19,235 15,381 13,703
Maintenance capital                 170 120 93
Transportation
                      
Revenues:                      
External Customers                 623 572 565
Intersegment                 793 593 480
Total revenues of reportable segments                 1,416 1,165 1,045
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 38 13 3
Segment profit                 710 555 516
Capital expenditures                 1,244 600 329
Total assets 6,423       5,156       6,423 5,156 4,701
Maintenance capital                 108 86 67
Facilities
                      
Revenues:                      
External Customers                 736 638 339
Intersegment                 362 158 151
Total revenues of reportable segments                 1,098 796 490
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 482 358 270
Capital expenditures                 1,724 1,317 270
Total assets 6,134       4,506       6,134 4,506 3,303
Maintenance capital                 49 22 17
Supply and Logistics
                      
Revenues:                      
External Customers                 36,438 33,065 24,989
Intersegment                 2 3 1
Total revenues of reportable segments                 36,440 33,068 24,990
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 753 647 240
Capital expenditures                 503 18 163
Total assets 6,678       5,719       6,678 5,719 5,699
Maintenance capital                 13 12 9
Interest expense related to hedged inventory purchases                 $ 12 $ 20 $ 17