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Inventory (Tables)

12 Months Ended

Dec. 31, 2012

Inventory Tables [Abstract]

Inventory Balance By Type

		2012			2011
		(in millions)
Coal, fuel oil and other raw materials		$	373		$	434
Spare parts and supplies			396			341
Total		$	769		$	775

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- Definition

Tabular disclosure of inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle including inventoried costs relating to long-term contracts or programs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 2

-Paragraph 6

-Subparagraph a,b,c

-Article 5

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