Consolidated Condensed Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Operating revenues:
Commodity revenue	$ 1,852		$ 2,128		$ 3,795		$ 4,666
Mark-to-market gain (loss)	(113)		467		232		523
Other revenue	5		4		9		9
Operating revenues	1,744	[1]	2,599	[1]	4,036	[2]	5,198	[2]
Operating expenses:
Commodity expense	1,110		1,367		2,457		3,125
Mark-to-market (gain) loss	(148)		280		(4)		290
Fuel and purchased energy expense	962		1,647		2,453		3,415
Operating and maintenance expense	266		245		506		484
Depreciation and amortization expense	163		175		327		349
General and other administrative expense	31		34		62		66
Other operating expenses	14		19		31		38
Total operating expenses	1,436		2,120		3,379		4,352
Impairment losses	0		40		0		55
(Income) from unconsolidated subsidiaries	(4)		(5)		(4)		(11)
Income from operations	312		444		661		802
Interest expense	167		157		336		306
(Gain) loss on extinguishment of debt	8		3		8		(1)
Other (income) expense, net	5		5		9		28
Income before income taxes	132		279		308		469
Income tax expense (benefit)	(31)		9		15		19
Net income (loss)	163		270		293		450
Net income attributable to the noncontrolling interest	0		(4)		(2)		(9)
Net income attributable to Calpine	$ 163		$ 266		$ 291		$ 441

[1] Includes intersegment revenues of $70 million and $100 million in the West, $214 million and $348 million in Texas, $24 million and $228 million in the East and $2 million and $1 million in Retail for the three months ended June 30, 2020 and 2019, respectively.

[2] Includes intersegment revenues of $189 million and $262 million in the West, $432 million and $559 million in Texas, $199 million and $365 million in the East and $3 million and $4 million in Retail for the six months ended June 30, 2020 and 2019, respectively.