Consolidated Condensed Statements of Operations (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating revenues:
Commodity revenue	$ 1,638	$ 2,048
Mark-to-market gain (loss)	3	(86)
Other revenue	5	3
Operating revenues	1,646	1,965
Operating expenses:
Commodity expense	1,077	1,370
Mark-to-market (gain)	(67)	(13)
Fuel and purchased energy expense	1,010	1,357
Plant operating expense	260	265
Depreciation and amortization expense	158	153
Sales, general and other administrative expense	37	33
Other operating expenses	20	22
Total operating expenses	1,485	1,830
(Income) from unconsolidated investments in power plants	(5)	(9)
Income from operations	166	144
Interest expense	154	166
Interest (income)	(1)	(1)
Debt extinguishment costs	19	1
Other (income) expense, net	2	10
Loss before income taxes	(8)	(32)
Income tax benefit	(1)	(19)
Net income (loss)	(7)	(13)
Net income attributable to the noncontrolling interest	(3)	(4)
Net loss attributable to Calpine	$ (10)	$ (17)
Basic and diluted loss per common share attributable to Calpine:
Weighted Average Number of Shares Outstanding, Basic and Diluted	372,935	420,105
Earnings Per Share, Basic and Diluted	$ (0.03)	$ (0.04)