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Operating Segments - Segment Financial Data (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Operating Segments                      
Operating segments number | segment                 3    
Revenues:                      
Total revenues $ 4,996 $ 5,551 $ 6,663 $ 5,942 $ 9,459 $ 11,127 $ 11,195 $ 11,684 $ 23,152 $ 43,464 $ 42,249
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 183 108 64
Segment profit                 1,877 2,291 2,167
Capital expenditures                 2,275 3,125 1,641
Maintenance capital                 220 224 176
Total assets 22,288       22,198       22,288 22,198 20,320
Investments in unconsolidated entities 2,027       1,735       2,027 1,735 485
Transportation                      
Revenues:                      
Total revenues                 697 774 701
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Equity earnings in unconsolidated entities                 183 108 64
Segment profit                 917 925 729
Capital expenditures                 1,278 2,483 1,046
Maintenance capital                 144 165 123
Total assets 10,345       9,579       10,345 9,579 7,181
Investments in unconsolidated entities 1,998       1,735       1,998 1,735 485
Facilities                      
Revenues:                      
Total revenues                 528 576 856
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 579 584 616
Capital expenditures                 813 582 549
Maintenance capital                 68 52 38
Total assets 7,330       6,843       7,330 6,843 6,555
Investments in unconsolidated entities 29               29    
Supply and Logistics                      
Revenues:                      
Total revenues                 21,927 42,114 40,692
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments                      
Segment profit                 381 782 822
Interest expense related to hedged inventory purchases                 6 12 30
Capital expenditures                 184 60 46
Maintenance capital                 8 7 15
Total assets $ 4,613       $ 5,776       4,613 5,776 6,584
Operating Segments                      
Revenues:                      
Total revenues                 24,589 44,932 43,571
Operating Segments | Transportation                      
Revenues:                      
Total revenues                 1,594 1,655 1,498
Operating Segments | Facilities                      
Revenues:                      
Total revenues                 1,050 1,127 1,377
Operating Segments | Supply and Logistics                      
Revenues:                      
Total revenues                 21,945 42,150 40,696
Intersegment                      
Revenues:                      
Total revenues                 (1,437) (1,468) (1,322)
Intersegment | Transportation                      
Revenues:                      
Total revenues                 (897) (881) (797)
Intersegment | Facilities                      
Revenues:                      
Total revenues                 (522) (551) (521)
Intersegment | Supply and Logistics                      
Revenues:                      
Total revenues                 $ (18) $ (36) $ (4)