Consolidated Statements of Operations - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues:
Commodity revenue		$ 9,437	$ 9,865	$ 8,836
Mark to Market Gain Loss on Derivatives included in Operating Revenues		618	(373)	(101)
Other revenue		17	20	17
Operating revenues	[1]	10,072	9,512	8,752
Operating expenses:
Commodity expense		6,164	6,914	6,268
Mark to Market Gain Loss on Derivatives Included in Fuel and Purchased Energy Expense		340	(165)	70
Fuel and purchased energy expense		6,504	6,749	6,338
Operating and maintenance expense		1,001	1,020	1,080
Depreciation and amortization expense		694	739	724
General and other administrative expense		150	158	155
Other operating expenses		79	98	85
Total operating expenses		8,428	8,764	8,382
Impairment losses		84	10	41
(Gain) on sale of assets, net		(10)	0	(27)
(Income) from unconsolidated subsidiaries		(22)	(24)	(22)
Income from operations		1,592	762	378
Interest expense		609	617	621
(Gain) loss on extinguishment of debt		58	(28)	38
Other (income) expense, net		37	81	32
Income before income taxes		888	92	(313)
Income tax expense		98	64	8
Net income (loss)		790	28	(321)
Net income attributable to the noncontrolling interest		(20)	(18)	(18)
Net income (loss) attributable to Calpine		$ 770	$ 10	$ (339)

[1] Includes intersegment revenues of $530 million, $488 million and $324 million in the West, $946 million, $573 million and $361 million in Texas, $522 million, $234 million and $237 million in the East and $11 million, $4 million, $4 million in Retail for the years ended December 31, 2019, 2018 and 2017, respectively.