Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ 790	$ 28	$ (321)
Cash flow hedging activities:
Gain (loss) on cash flow hedges before reclassification adjustment for cash flow hedges realized in net income (loss)	(42)	40	(22)
Reclassification adjustment for loss on cash flow hedges realized in net income (loss)	2	6	48
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(2)	1	0
Foreign currency translation gain (loss)	3	(10)	13
Income tax benefit (expense)	2	(5)	(6)
Other comprehensive income (loss)	(37)	32	33
Comprehensive income (loss)	753	60	(288)
Comprehensive (income) attributable to the noncontrolling interest	(20)	(21)	(20)
Comprehensive income (loss) attributable to Calpine	$ 733	$ 39	$ (308)