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Partners' Capital and Distributions (Details 5) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Continuous Offering Program
Dec. 31, 2012
Continuous Offering Program
Dec. 31, 2012
Continuous Offering Program
Minimum
Dec. 31, 2013
Continuous Offering Program
Maximum
Mar. 31, 2012
Other Equity Offerings
Nov. 30, 2011
Other Equity Offerings
Mar. 31, 2011
Other Equity Offerings
Dec. 31, 2012
Other Equity Offerings
Dec. 31, 2011
Other Equity Offerings
Partners Capital and Distribution                        
Maximum aggregate offer price of common stock           $ 300 $ 750          
Units Issued       8,600,000 12,000,000     11,500,000 12,000,000 15,870,000 11,500,000 27,870,000
Gross Unit Price (in dollars per unit)               $ 40.015 $ 32.515 $ 32.000    
Proceeds from Sale               460 390 508 460 898
Contribution from general partner               9 9 10 9 19
Costs               (14) (13) (15) (14) (28)
Net proceeds from Sale 477 979 889 477 524     455 386 503 455 889
Commissions paid       $ 5 $ 6