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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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CONDENSED CONSOLIDATED BALANCE SHEETS |  |
Senior notes, unamortized discount (in dollars) | $ 14 | $ 13
Common unitholders, units outstanding (in units) | 331,619,386 | 310,753,874

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