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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Senior notes, unamortized discount $ 17us-gaap_DebtInstrumentUnamortizedDiscount $ 18us-gaap_DebtInstrumentUnamortizedDiscount
Common unitholders, units outstanding (in units) 397,241,697us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 375,107,793us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding