Consolidated Condensed Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating revenues:
Commodity revenue	$ 1,551	$ 1,407	$ 3,136	$ 3,045
Mark-to-market gain (loss)	(391)	31	(366)	34
Other revenue	4	4	9	9
Operating revenues	1,164	1,442	2,779	3,088
Operating expenses:
Commodity expense	897	734	1,903	1,811
Mark-to-market (gain) loss	(355)	32	(235)	(35)
Fuel and purchased energy expense	542	766	1,668	1,776
Plant operating expense	271	272	526	532
Depreciation and amortization expense	162	160	342	318
Sales, general and other administrative expense	35	30	73	67
Other operating expenses	17	20	37	40
Total operating expenses	1,027	1,248	2,646	2,733
(Income) from unconsolidated investments in power plants	(3)	(7)	(10)	(12)
Income from operations	140	201	143	367
Interest expense	157	158	314	312
Interest (income)	(1)	(1)	(2)	(2)
Debt modification and extinguishment costs	15	13	15	32
Other (income) expense, net	7	5	13	7
Income (loss) before income taxes	(38)	26	(197)	18
Income tax expense (benefit)	(14)	5	21	4
Net income (loss)	(24)	21	(218)	14
Net income attributable to the noncontrolling interest	(5)	(2)	(9)	(5)
Net income (loss) attributable to Calpine	$ (29)	$ 19	$ (227)	$ 9
Basic earnings (loss) per common share attributable to Calpine:
Weighted average number of shares outstanding, basic	354,066	366,975	353,784	369,938
Earnings per share, basic	$ (0.08)	$ 0.05	$ (0.64)	$ 0.02
Weighted Average Number of Shares Outstanding, Diluted	354,066	369,946	353,784	373,404
Earnings Per Share, Diluted	$ (0.08)	$ 0.05	$ (0.64)	$ 0.02