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Equity Equity, ATM Program (Details) - 2015 ATM Program - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Aug. 24, 2015
Aug. 06, 2015
Jun. 30, 2016
Sep. 30, 2016
Supplemental prospectus, filing date Aug. 24, 2015      
Registration Filing Date   Aug. 06, 2015    
Common Units Aggregate Value $ 750      
Issuance of units     1,492,367  
Equity offering, net of issuance costs     $ 38 $ 72