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Partners' Capital and Distributions (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2012
BP NGL Acquisition
Dec. 31, 2011
Pacific
Dec. 31, 2010
Pacific
Dec. 31, 2009
Pacific
Dec. 31, 2008
Pacific
Dec. 31, 2007
Pacific
Dec. 31, 2011
Rainbow
Dec. 31, 2010
Rainbow
Dec. 31, 2009
Rainbow
Dec. 31, 2008
Rainbow
Dec. 31, 2011
PNGS Acquisition
Dec. 31, 2010
PNGS Acquisition
Dec. 31, 2009
PNGS Acquisition
Reduction in incentive distributions                                    
Reduction in incentive distributions $ 7.00 $ 16.00 $ 22.00 $ 18.00 $ 20.00 $ 11.25 $ 5.00 $ 10.00 $ 15.00 $ 15.00 $ 20.00   $ 1.00 $ 6.00 $ 3.00 $ 2.00 $ 5.00 $ 1.00
Reduction in incentive distributions related to acquisition, total 83           65         10       8    
Reduction in incentive distributions per quarter through February 2014 (in dollars per quarter)           3.75                        
Reduction in incentive distributions per quarter after February 2014 (in dollars per quarter)           $ 2.5