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Partners' Capital and Distributions (Details 9) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Oct. 02, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
May 2012 Continuous Offering Program
May 09, 2012
May 2012 Continuous Offering Program
Dec. 31, 2012
September 2012 Continuous Offering Program
Sep. 13, 2012
September 2012 Continuous Offering Program
Oct. 02, 2012
Other Equity Offerings
Mar. 31, 2012
Other Equity Offerings
Nov. 30, 2011
Other Equity Offerings
Mar. 31, 2011
Other Equity Offerings
Nov. 30, 2010
Other Equity Offerings
Dec. 31, 2012
Other Equity Offerings
Dec. 31, 2011
Other Equity Offerings
Dec. 31, 2010
Other Equity Offerings
Partners Capital and Distribution [Line Items]                                
Maximum aggregate offer price of common stock           $ 300   $ 500                
Units Sold   23,500,000 27,900,000 9,600,000 7,200,000   4,800,000     11,500,000 12,000,000 15,870,000 9,560,000 11,500,000 27,870,000 9,560,000
Unit split conversion ratio 2       2   2   2              
Gross Unit Price (in dollars per unit)                   $ 40.015 $ 32.515 $ 32.000 $ 31.300      
Proceeds from Sale         302   222     460 390 508 299 460 898 299
General Partner Contribution                   9 9 10 6 9 19 6
Costs                   (14) (13) (15) (9) (14) (28) (9)
Net Proceeds   979 889 296           455 386 503 296 455 889 296
Commissions paid         $ 4   $ 2