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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS    
Senior notes, unamortized discount $ 18us-gaap_DebtInstrumentUnamortizedDiscount $ 15us-gaap_DebtInstrumentUnamortizedDiscount
Common unitholders, units outstanding (in units) 375,107,793us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 359,133,200us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding