Consolidated Condensed Statements of Operations - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Operating revenues:
Commodity revenue		$ 2,396	$ 2,063
Mark-to-market gain (loss)		(391)	214
Other revenue		4	4
Operating revenues	[1]	2,009	2,281
Operating expenses:
Commodity expense		1,790	1,533
Mark-to-market (gain) loss		(20)	159
Fuel and purchased energy expense		1,770	1,692
Operating and maintenance expense		275	282
Depreciation and amortization expense		201	206
General and other administrative expense		60	40
Other operating expenses		37	20
Total operating expenses		2,343	2,240
Gain on sale of assets, net		0	(27)
(Income) from unconsolidated subsidiaries		(6)	(4)
Income (loss) from operations		(328)	72
Interest expense		151	159
Debt extinguishment costs		0	24
Other (income) expense, net		7	2
Loss before income taxes		(486)	(113)
Income tax expense (benefit)		108	(61)
Net income (loss)		(594)	(52)
Net income attributable to the noncontrolling interest		(4)	(4)
Net loss attributable to Calpine		$ (598)	$ (56)

[1] Includes intersegment revenues of $114 million and $61 million in the West, $(67) million and $72 million in Texas, $115 million and $88 million in the East and $1 million and $1 million in Retail for the three months ended March 31, 2018 and 2017, respectively. Intersegment revenues for sales between wholesale and retail operations are executed to manage supply needs for our retail operations from our wholesale fleet or to facilitate margin collateral netting at Calpine Corporation.