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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segment
Sep. 30, 2013
Operating Segments        
Operating segments number     3  
Revenues:        
Revenues $ 11,127 $ 10,703 $ 34,005 $ 31,617
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 29 19 73 42
Segment profit 530 408 1,627 1,640
Maintenance capital 56 42 151 124
Transportation
        
Revenues:        
Revenues 198 179 574 517
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 29 19 73 42
Segment profit 231 198 658 522
Maintenance capital 35 29 111 84
Facilities
        
Revenues:        
Revenues 141 138 443 558
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 147 146 435 445
Maintenance capital 19 6 34 23
Supply and Logistics
        
Revenues:        
Revenues 10,788 10,386 32,988 30,542
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment profit 152 64 534 673
Maintenance capital 2 7 6 17
Interest expense related to hedged inventory 4 8 11 21
Operating Segments
        
Revenues:        
Revenues 11,498 11,044 35,101 32,638
Operating Segments | Transportation
        
Revenues:        
Revenues 424 378 1,222 1,111
Operating Segments | Facilities
        
Revenues:        
Revenues 281 280 858 983
Operating Segments | Supply and Logistics
        
Revenues:        
Revenues 10,793 10,386 33,021 30,544
Intersegment
        
Revenues:        
Revenues (371) (341) (1,096) (1,021)
Intersegment | Transportation
        
Revenues:        
Revenues (226) (199) (648) (594)
Intersegment | Facilities
        
Revenues:        
Revenues (140) (142) (415) (425)
Intersegment | Supply and Logistics
        
Revenues:        
Revenues $ (5)   $ (33) $ (2)