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Equity Equity, ATM Program (Details) - 2015 ATM Program - USD ($)
$ in Millions
3 Months Ended
Aug. 21, 2015
Aug. 06, 2015
Mar. 31, 2016
Supplemental prospectus, filing date Aug. 24, 2015    
Registration Filing Date   Aug. 06, 2015  
Common Units Aggregate Value $ 750    
Issuance of units     103,748
Equity offering, net of issuance costs     $ 5