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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 30, 2015
Jul. 30, 2015
May. 05, 2015
Feb. 20, 2015
Sep. 30, 2015
Subsequent Event [Line Items]          
Distribution declared per depositary unit   $ 1.50 $ 1.50 $ 1.50  
Effect on Future Cash Flows, Amount         $ 15
Distribution declared [Member]          
Subsequent Event [Line Items]          
Distribution declared per depositary unit $ 1.50