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Quarterly Consolidated Financial Data (unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Operating revenues | $ 1,438 | $ 2,050 | $ 1,572 | $ 1,241 | $ 1,367 | $ 1,996 | $ 879 | $ 1,236 | $ 6,301 | $ 5,478 | $ 6,800 |
| Income (loss) from operations | 151 | 597 | 122 | 4 | 295 | 705 | (193) | 195 | 874 | 1,002 | 800 |
| Net income (loss) attributable to Calpine | $ (97) | $ 306 | $ (70) | $ (125) | $ 100 | $ 437 | $ (329) | $ (9) | $ 14 | $ 199 | $ (190) |
| Net income (loss) per common share attributable to Calpine — basic (in dollars per share) | $ (0.23) | $ 0.70 | $ (0.16) | $ (0.28) | $ 0.22 | $ 0.95 | $ (0.69) | $ (0.02) | $ 0.03 | $ 0.43 | $ (0.39) |
| Net income (loss) per common share attributable to Calpine — diluted (in dollars per share) | $ (0.23) | $ 0.70 | $ (0.16) | $ (0.28) | $ 0.22 | $ 0.94 | $ (0.69) | $ (0.02) | $ 0.03 | $ 0.42 | $ (0.39) |