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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS
Senior notes, unamortized discount (in dollars)	$ 13	$ 12
Common unitholders, units outstanding (in units)	155,376,937	141,199,175

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- Definition

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

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- Definition

The number of limited partner units outstanding.

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