Consolidated Condensed Statements of Operations (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating revenues:
Commodity revenue	$ 2,048	$ 1,308
Unrealized mark-to-market (loss)	(86)	(71)
Other revenue	3	4
Operating revenues	1,965	1,241
Operating expenses:
Commodity expense	1,370	835
Unrealized mark-to-market (gain)	(13)	(14)
Fuel and purchased energy expense	1,357	821
Plant operating expense	265	227
Depreciation and amortization expense	153	146
Sales, general and other administrative expense	33	33
Other operating expenses	22	18
Total operating expenses	1,830	1,245
(Income) from unconsolidated investments in power plants	(9)	(8)
Income from operations	144	4
Interest expense	166	176
Interest (income)	(1)	(2)
Other (income) expense, net	11	5
Loss before income taxes	(32)	(175)
Income tax benefit	(19)	(50)
Net loss	(13)	(125)
Net income attributable to the noncontrolling interest	(4)	0
Net loss attributable to Calpine	$ (17)	$ (125)
Weighted Average Number of Shares Outstanding, Basic and Diluted	420,105	451,706
Earnings Per Share, Basic and Diluted	$ (0.04)	$ (0.28)