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Acquisitions, Divestitures and Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2010
Acquisitions, Divestitures and Discontinued Operations [Abstract] |  |
Business Acquisition, Pro Forma Information |  | The following table summarizes the pro forma operating revenues and net income (loss) attributable to Calpine for 2010 as if the Conectiv Acquisition had occurred on January 1, 2009. The pro forma information has been prepared by adding the preliminary, unaudited historical results of Conectiv, as adjusted for depreciation expense (utilizing the preliminary values assigned to the net assets acquired from Conectiv), interest expense from NDH Project Debt and income taxes to our historical results for the periods indicated below (in millions, except per share amounts).
|  | 2010
Operating revenues |  | $ | 7,931 |
Net loss attributable to Calpine |  | $ | (83 | )
Basic loss per common share attributable to Calpine |  | $ | (0.17 | )
Diluted loss per common share attributable to Calpine |  | $ | (0.17 | )
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures |  | The table below presents the components of our discontinued operations for the period presented (in millions):
|  | 2010
Operating revenues |  | $ | 92 |
Gain on disposal of discontinued operations |  | 209 |
Income from discontinued operations before taxes |  | 43 |
Less: Income tax expense |  | 59 |
Discontinued operations, net of tax |  | $ | 193 |
Losses Due To Acquisition | We recorded a total pre-tax loss of approximately $125 million on our Consolidated Statement of Operations for the year ended December 31, 2010, for this transaction, which was recorded as shown below (in millions):
Broad River: debt extinguishment costs | $ | 30 |
South Point: impairment loss | 95 |
Total loss recorded for this transaction | $ | 125 |

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