CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Tax effect of available for sale securities arising during the period	$ 24	$ 1	$ 23	$ (20)
Tax effect of prior service costs for defined benefit plans	0	0	2	0
Tax effect of net actuarial gain for defined benefit plans	0	0	(30)	0
Tax effect of available-for-sale securities reclassified from accumulated other comprehensive income (loss)	0	4	2	6
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	2	2	9	11
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	(1)	0	(2)
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss)	(2)	0	(8)	(2)
Talen Energy Supply
Tax effect of available for sale securities arising during the period	24	1	23	(20)
Tax effect of prior service costs for defined benefit plans	0	0	2	0
Tax effect of net actuarial gain for defined benefit plans	0	0	(30)	0
Tax effect of available-for-sale securities reclassified from accumulated other comprehensive income (loss)	0	4	2	6
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	2	2	9	11
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	(1)	0	(2)
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss)	$ (2)	$ 0	$ (8)	$ (2)