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

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