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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Southern Pines Acquisition
Dec. 31, 2011
Gardendale Gathering System Acquisition
Dec. 31, 2012
BP NGL Acquisition
Dec. 31, 2012
Other acquisitions
Dec. 31, 2012
Dec. 31, 2012
Transportation
Dec. 31, 2011
Transportation
Dec. 31, 2011
Transportation
Gardendale Gathering System Acquisition
Dec. 31, 2012
Transportation
BP NGL Acquisition
Dec. 31, 2012
Transportation
Other acquisitions
Dec. 31, 2012
Facilities
Dec. 31, 2011
Facilities
Dec. 31, 2010
Facilities
Dec. 31, 2011
Facilities
Southern Pines Acquisition
Dec. 31, 2012
Facilities
BP NGL Acquisition
Dec. 31, 2012
Facilities
Dec. 31, 2012
Supply and Logistics
Dec. 31, 2011
Supply and Logistics
Dec. 31, 2012
Supply and Logistics
BP NGL Acquisition
Changes in goodwill                                          
Balance at beginning of period $ 1,854 $ 1,376           $ 818 $ 640       $ 1,171 $ 609 $ 308       $ 427 $ 428  
Acquisitions     301 155 236 10 426     155 72 10       301 136 426     28
Foreign currency translation adjustments 7 (6)           5 (5)                   2 (1)  
Purchase price accounting adjustments and other 2 28           (8) 28                   10    
Balance at end of period $ 2,535 $ 1,854           $ 897 $ 818       $ 1,171 $ 609 $ 308       $ 467 $ 427