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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
CONDENSED CONSOLIDATED BALANCE SHEETS    
Senior notes, unamortized discount $ 16 $ 15
Common unitholders, units outstanding (in units) 371,468,177 359,133,200