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Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
segment
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
segment
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
segment
Dec. 31, 2010
segment
Dec. 31, 2009
segment
Oct. 31, 2011
BP NGL Acquisition
Dec. 31, 2011
Transportation
Dec. 31, 2010
Transportation
Dec. 31, 2009
Transportation
Dec. 31, 2011
Facilities
Dec. 31, 2010
Facilities
Dec. 31, 2009
Facilities
Dec. 31, 2011
Facilities
BP NGL Acquisition
Dec. 31, 2011
Supply and Logistics
Dec. 31, 2010
Supply and Logistics
Dec. 31, 2009
Supply and Logistics
Operating Segments                                            
Operating segments number 3       3       3 3 3                      
Revenues:                                            
External Customers $ 8,884 $ 8,837 $ 8,859 $ 7,694 $ 7,231 $ 6,414 $ 6,124 $ 6,125 $ 34,275 $ 25,893 $ 18,520   $ 572 $ 565 $ 536 $ 638 $ 339 $ 227   $ 33,065 $ 24,989 $ 17,757
Intersegment                 754 632 562   593 480 425 158 151 135   3 1 2
Total revenues of reportable segments                 35,029 26,525 19,082   1,165 1,045 961 796 490 362   33,068 24,990 17,759
Equity earnings in unconsolidated entities                 13 3 15   13 3 7     8        
Segment profit                 1,560 1,026 1,030   555 516 477 358 270 208   647 240 345
Capital expenditures                 1,935 762 757   600 329 183 1,317 270 564   18 163 10
Total assets 15,381       13,703       15,381 13,703 12,358   5,156 4,701 4,468 4,506 3,303 3,097   5,719 5,699 4,793
Maintenance capital                 120 93 81   86 67 57 22 17 16   12 9 8
Interest expense related to hedged inventory purchases                                       20 17 11
Cash deposit related to pending acquisition included in capital expenditures                       $ 50             $ 50