v2.3.0.15

Acquisitions, Divestitures and Discontinued Operations (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |
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Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 06, 2010 | Jul. 02, 2010 | Sep. 30, 2011 Conectiv | Sep. 30, 2010 Conectiv | Mar. 02, 2011 Conectiv
Summary of Conectiv Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  | $ 1,640,000,000 |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | 78,000,000 |  |  |
Property, plant and equipment, net |  |  |  |  |  |  | 1,574,000,000 |  |  |
Other long-term assets |  |  |  |  |  |  | 85,000,000 |  |  |
Total assets acquired |  |  |  |  |  |  | 1,737,000,000 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  | 46,000,000 |  |  |
Long-term liabilities |  |  |  |  |  |  | 51,000,000 |  |  |
Total liabilities assumed |  |  |  |  |  |  | 97,000,000 |  |  |
Net assets acquired |  |  |  |  |  |  | 1,640,000,000 |  |  |
Components of Discontinued Operations |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  | 25,000,000 |  | 74,000,000 |  |  |  |  |
Income from discontinued operations before taxes |  |  | 17,000,000 |  | 37,000,000 |  |  |  |  |
Income tax expense |  |  | (2,000,000) |  | 6,000,000 |  |  |  |  |
Discontinued operations, net of tax expense |  |  | 19,000,000 |  | 31,000,000 |  |  |  |  |
Number of Conectiv power plants acquired |  |  |  |  |  |  | 18 |  |  |
Cap on environmental remediation liabilities acquired |  |  |  |  |  |  | 10,000,000 |  |  |
Number of Conectiv employees who joined Calpine |  |  |  |  |  |  | 130 |  |  |
Proceeds from NDH Project Debt |  |  |  |  |  |  | 1,300,000,000 |  |  |
Blue Spruce and Rocky Mountain ownership interest sold percentage |  |  |  |  |  | 100.00% |  |  |  |
Blue Spruce and Rocky Mountain sale price |  |  |  |  |  | 739,000,000 |  |  |  |
Blue Spruce and Rocky Mountain gain on sale |  | 209,000,000 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Power generation capacity acquired (in Megawatts) | 11,372 | 13,553 |  | 11,372 |  |  |  |  |  | 4,491
Calpine cash contribution |  |  |  | $ 87,000,000 | $ 1,000,000 |  |  | $ 110,000,000 | $ 540,000,000 |

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