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Partners' Capital and Distributions (Details 4) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Feb. 14, 2013
Jan. 07, 2013
Oct. 02, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
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, 2012
Dec. 31, 2011
Dec. 31, 2010
Partners' Capital and Distributions                                    
Cash distributions paid to common unit holders $ 189                             $ 684 $ 575 $ 512
Cash distribution paid to General Partner - Incentive 81                             271 204 160
Cash distributions paid to General Partner - 2% 4                             14 12 10
Total distributions paid during the period $ 274                             $ 969 $ 791 $ 682
Cash distributions per limited partner unit (in dollars per unit)       $ 0.5425 $ 0.5325 $ 0.5225 $ 0.5125 $ 0.4975 $ 0.4913 $ 0.4850 $ 0.4788 $ 0.4750 $ 0.4713 $ 0.4675 $ 0.4638 $ 2.1100 $ 1.9525 $ 1.88
Unit split conversion ratio     2                              
Unitholders of record, date Feb. 01, 2013                                  
Cash distribution declared (in dollars per unit)   $ 0.5625