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Inventory (Tables) | 3 Months Ended
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Mar. 31, 2012
Inventory Tables [Abstract] |
Inventory Balance By Type |
|  | March 31, |  | December 31,
|  | 2012 |  | 2011
|  | (in millions)
Coal, fuel oil and other raw materials |  | $ | 432 |  | $ | 444
Spare parts and supplies |  |  | 367 |  |  | 341
Total |  | $ | 799 |  | $ | 785

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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 -Topic -SubTopic -Publisher SEC -Number 210 -Article 5 -Subparagraph a,b,c -Name Regulation S-X (SX) -Paragraph 6 -Section 2 + Details
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