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Partners' Capital and Distributions (Details 3) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2012
Jan. 31, 2012
Nov. 30, 2011
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2009
Jun. 30, 2009
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Reduction in incentive distributions                                        
Reduction in incentive distributions     $ 1                         $ 7 $ 16 $ 22 $ 18 $ 20
Reduction in incentive distributions related to acquisition, total                               83        
Period for reduction of incentive (in years)                               2 years        
Reduction in incentive distributions per year for the first two years (in dollars per year)                               15        
Reduction in incentive distributions per year for the third year and thereafter (in dollars per year)       10                       10        
Cash distributions paid to common unit holders                               575 512 468    
Cash distribution paid to General Partner - Incentive                               204 160 127    
Cash distributions paid to General Partner - 2%                               12 10 10    
Distributions paid to common unit holders and general partner                               791 682 605    
Cash distributions per limited partner unit (in dollars per unit)       $ 0.9950 $ 0.9825 $ 0.9700 $ 0.9575 $ 0.9500 $ 0.9425 $ 0.9350 $ 0.9275 $ 0.9200 $ 0.9050 $ 0.9050 $ 0.8925 $ 3.91 $ 3.76 $ 3.62    
Subsequent cash distribution declared (in dollars per unit)   $ 1.025                                    
Subsequent cash distribution - date paid (in calendar date) February 14 , 2012                                      
Subsequent cash distribution paid to all ownership interests 225                                      
Subsequent cash distribution paid to common unit holders 159                                      
Subsequent cash distribution paid to General Partner - 2% ownership interest 3                                      
Subsequent cash distribution paid to General Partner - Incentive 63                                      
Pacific
                                        
Reduction in incentive distributions                                        
Reduction in incentive distributions                               5 10 15 15 20
Reduction in incentive distributions related to acquisition, total                               65        
Rainbow
                                        
Reduction in incentive distributions                                        
Reduction in incentive distributions                                 1 6 3  
Reduction in incentive distributions related to acquisition, total                               10        
PNGS Acquisition
                                        
Reduction in incentive distributions                                        
Reduction in incentive distributions                               2 5 1    
Reduction in incentive distributions related to acquisition, total                               $ 8