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Partners' Capital and Distributions (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Partners Capital and Distribution    
Net proceeds from Sale $ 151 $ 131
Continuous Offering Program
   
Partners Capital and Distribution    
Units Issued 2.8  
Net proceeds from Sale 151  
Commissions paid $ 1