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Consolidated Statements of Operations (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating revenues:    
Commodity revenue $ 1,308 $ 1,212
Unrealized mark-to-market gain (loss) (71) 22
Other revenue 4 2
Operating revenues 1,241 1,236
Operating expenses:    
Commodity expense 835 691
Unrealized mark-to-market (gain) (14) (56)
Fuel and purchased energy expense 821 635
Plant operating expense 227 221
Depreciation and amortization expense 146 140
Sales, general and other administrative expense 33 33
Other operating expenses 18 21
Total operating expenses 1,245 1,050
(Income) from unconsolidated investments in power plants (8) (9)
Income (loss) from operations 4 195
Interest expense 176 185
Loss on interest rate derivatives 0 14
Interest (income) (2) (3)
Debt extinguishment costs 0 12
Other (income) expense, net 5 2
Income (loss) before income taxes (175) (15)
Income tax benefit (50) (6)
Net loss (125) (9)
Net income attributable to the noncontrolling interest 0 0
Net loss attributable to Calpine $ (125) $ (9)
Basic and diluted loss per common share attributable to Calpine:    
Weighted average shares of common stock outstanding (in thousands) 451,706 478,106
Net loss per common share attributable to Calpine — basic and diluted $ (0.28) $ (0.02)