CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income (loss)	$ (3)	$ 26	$ 148	$ 122
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Available-for-sale securities, net of tax	8	(4)	11	1
Prior service costs, net of tax	0	(3)	0	(3)
Net actuarial gain, net of tax	0	46	0	46
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(3)	(1)	(2)	(2)
Qualifying derivatives, net of tax	(4)	(6)	(7)	(10)
Defined benefit plans:
Prior service costs, net of tax	0	(1)	0	(1)
Net actuarial loss, net of tax	4	5	7	9
Total other comprehensive income (loss)	5	36	9	40
Comprehensive income (loss)	2	62	157	162
Talen Energy Supply
Net income (loss)	4	26	155	122
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Available-for-sale securities, net of tax	8	(4)	11	1
Prior service costs, net of tax	0	(3)	0	(3)
Net actuarial gain, net of tax	0	46	0	46
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(3)	(1)	(2)	(2)
Qualifying derivatives, net of tax	(4)	(6)	(7)	(10)
Defined benefit plans:
Prior service costs, net of tax	0	(1)	0	(1)
Net actuarial loss, net of tax	4	5	7	9
Total other comprehensive income (loss)	5	36	9	40
Comprehensive income (loss)	$ 9	$ 62	$ 164	$ 162