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Partners' Capital and Distributions (Details 2) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Continuous Offering Program
Aug. 31, 2014
August 2014 Equity Distribution Agreement
Partners Capital and Distribution        
Maximum aggregate offer price of common stock       $ 900
Units Issued     11.8  
Net proceeds from sale 669 400 669  
Contribution from general partner     14  
Commissions paid     $ 7