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Comprehensive Income (Loss) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Comprehensive income (loss) table [Abstract] |  |  |  |
Net income (loss) | $ 190 | $ 217 | $ (176) | $ 55
Gain on cash flow hedges | (74) | 65 | (60) | 95
Reclassification adjustment for cash flow hedges realized in net loss | (20) | (12) | 24 | 10
Foreign currency translation gain | (4) |  | (4) |
Income tax (expense) benefit | 34 | 4 | 18 | (5)
Comprehensive income (loss) | 126 | 274 | (198) | 155
Add: Comprehensive (income) loss attributable to noncontrolling interest |  |  | (1) |
Comprehensive income (loss) attributable to Calpine | $ 126 | $ 274 | $ (199) | $ 155

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