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Inventory (Tables) | 3 Months Ended
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Mar. 31, 2013
Inventory Tables [Abstract] |
Inventory Balance By Type |
|  | March 31, |  | December 31,
|  | 2013 |  | 2012
|  | (in millions)
Coal, fuel oil and other raw materials |  | $ | 363 |  | $ | 373
Spare parts and supplies |  |  | 392 |  |  | 393
Total |  | $ | 755 |  | $ | 766

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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 + Details
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