v2.4.0.8
Consolidated Condensed Statements of Operations (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating revenues:        
Commodity revenue $ 2,020 $ 1,689 $ 4,867 $ 4,078
Unrealized mark-to-market gain (loss) 26 304 (14) 24
Other revenue 4 3 10 9
Operating revenues 2,050 1,996 4,863 4,111
Operating expenses:        
Commodity expense 1,076 812 2,909 2,073
Unrealized mark-to-market (gain) loss (17) 85 (29) 73
Fuel and purchased energy expense 1,059 897 2,880 2,146
Plant operating expense 200 207 684 699
Depreciation and amortization expense 150 140 441 418
Sales, general and other administrative expense 33 36 102 104
Other operating expenses 20 18 58 58
Total operating expenses 1,462 1,298 4,165 3,425
(Income) from unconsolidated investments in power plants (9) (7) (25) (21)
Income from operations 597 705 723 707
Interest expense 176 183 522 552
Loss on interest rate derivatives 0 0 0 14
Interest (income) (2) (2) (5) (7)
Debt extinguishment costs 0 0 68 12
Other (income) expense, net 7 6 15 14
Income before income taxes 416 518 123 122
Income tax expense 110 81 12 23
Net income 306 437 111 99
Net income attributable to the noncontrolling interest 0 0 0 0
Net income attributable to Calpine $ 306 $ 437 $ 111 $ 99
Basic earnings per common share attributable to Calpine:        
Weighted average shares of common stock outstanding (in thousands) 434,384 462,307 444,486 470,589
Net income per common share attributable to Calpine — basic $ 0.70 $ 0.95 $ 0.25 $ 0.21
Earnings Per Share, Diluted [Abstract]        
Weighted average shares of common stock outstanding (in thousands) 438,493 465,953 448,546 474,131
Net income per common share attributable to Calpine — diluted $ 0.70 $ 0.94 $ 0.25 $ 0.21