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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
BP NGL Acquisition
Dec. 31, 2012
Dec. 31, 2012
Other acquisitions
Dec. 31, 2013
Transportation
Dec. 31, 2012
Transportation
Dec. 31, 2012
Transportation
BP NGL Acquisition
Dec. 31, 2012
Transportation
Other acquisitions
Dec. 31, 2013
Facilities
Dec. 31, 2011
Facilities
Dec. 31, 2012
Facilities
BP NGL Acquisition
Dec. 31, 2012
Facilities
Dec. 31, 2013
Supply and Logistics
Dec. 31, 2012
Supply and Logistics
Dec. 31, 2012
Supply and Logistics
BP NGL Acquisition
Changes in goodwill                                
Balance at beginning of period $ 2,535 $ 1,854       $ 897 $ 818     $ 1,171 $ 609     $ 467 $ 427  
Acquisitions 6   236 426 10 6   72 10     136 426     28
Foreign currency translation adjustments (33) 7       (20) 5     (9)       (4) 2  
Purchase price accounting adjustments and other (5) 2       (5) (8)               10  
Balance at end of period $ 2,503 $ 2,535 $ 236 $ 426   $ 878 $ 897     $ 1,162 $ 609     $ 463 $ 467