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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
segment
Dec. 31, 2012
Dec. 31, 2011
Operating Segments                      
Operating segments number                 3    
Revenues:                      
Revenues $ 10,631 $ 10,703 $ 10,295 $ 10,620 $ 9,439 $ 9,354 $ 9,786 $ 9,218 $ 42,249 $ 37,797 $ 34,275
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 64 38 13
Segment profit                 2,167 1,945 1,560
Capital expenditures                 1,641 3,471 1,935
Total assets 20,360       19,235       20,360 19,235 15,381
Maintenance capital                 176 170 120
Transportation
                      
Revenues:                      
Revenues                 701 623 572
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 64 38 13
Segment profit                 729 710 555
Capital expenditures                 1,046 1,244 600
Total assets 7,221       6,423       7,221 6,423 5,156
Maintenance capital                 123 108 86
Facilities
                      
Revenues:                      
Revenues                 856 736 638
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 616 482 358
Capital expenditures                 549 1,724 1,317
Total assets 6,555       6,134       6,555 6,134 4,506
Maintenance capital                 38 49 22
Supply and Logistics
                      
Revenues:                      
Revenues                 40,692 36,438 33,065
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 822 753 647
Capital expenditures                 46 503 18
Total assets 6,584       6,678       6,584 6,678 5,719
Maintenance capital                 15 13 12
Interest expense related to hedged inventory                 30 12 20
Operating Segments
                      
Revenues:                      
Revenues                 43,571 38,954 35,029
Operating Segments | Transportation
                      
Revenues:                      
Revenues                 1,498 1,416 1,165
Operating Segments | Facilities
                      
Revenues:                      
Revenues                 1,377 1,098 796
Operating Segments | Supply and Logistics
                      
Revenues:                      
Revenues                 40,696 36,440 33,068
Intersegment
                      
Revenues:                      
Revenues                 (1,322) (1,157) (754)
Intersegment | Transportation
                      
Revenues:                      
Revenues                 (797) (793) (593)
Intersegment | Facilities
                      
Revenues:                      
Revenues                 (521) (362) (158)
Intersegment | Supply and Logistics
                      
Revenues:                      
Revenues                 $ (4) $ (2) $ (3)