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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Senior notes, unamortized discount (in dollars)	$ 14	$ 15
Common unitholders, units outstanding (in units)	341,691,037	335,283,874

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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