Consolidated Condensed Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenues:
Commodity revenue	$ 2,145	$ 1,551	$ 4,208	$ 3,136
Mark-to-market gain (loss)	(66)	(391)	148	(366)
Other revenue	5	4	9	9
Operating revenues	2,084	1,164	4,365	2,779
Operating expenses:
Commodity expense	1,513	897	3,046	1,903
Mark-to-market (gain) loss	16	(355)	175	(235)
Fuel and purchased energy expense	1,529	542	3,221	1,668
Plant operating expense	302	271	584	526
Depreciation and amortization expense	186	162	392	342
Sales, general and other administrative expense	40	35	80	73
Other operating expenses	20	17	40	37
Total operating expenses	2,077	1,027	4,317	2,646
Gain on sale of assets, net	0	0	(27)	0
(Income) from unconsolidated subsidiaries	(6)	(3)	(10)	(10)
Income from operations	13	140	85	143
Interest expense	154	157	313	314
Debt extinguishment costs	1	15	25	15
Other (income) expense, net	7	6	9	11
Loss before income taxes	(149)	(38)	(262)	(197)
Income tax expense (benefit)	63	(14)	2	21
Net income (loss)	(212)	(24)	(264)	(218)
Net income attributable to the noncontrolling interest	(4)	(5)	(8)	(9)
Net loss attributable to Calpine	$ (216)	$ (29)	$ (272)	$ (227)
Basic and diluted loss per common share attributable to Calpine:
Weighted average number of shares outstanding, basic and diluted	355,358	354,066	355,022	353,784
Loss per share, basic and diluted	$ (0.61)	$ (0.08)	$ (0.77)	$ (0.64)