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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS    
Senior notes, unamortized discount (in dollars) $ 15 $ 15
Common unitholders, units outstanding (in units) 337,739,553 335,283,874