CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Tax effect of available for sale securities arising during the period	$ (9)	$ 5	$ (12)	$ (1)
Tax effect of prior service costs for defined benefit plans	0	2	0	2
Tax effect of net actuarial gain for defined benefit plans	0	(30)	0	(30)
Tax effect of available-for-sale securities reclassified from accumulated other comprehensive income (loss)	3	1	2	2
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	3	4	5	7
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss)	(2)	(3)	(4)	(6)
Talen Energy Supply
Tax effect of available for sale securities arising during the period	(9)	5	(12)	(1)
Tax effect of prior service costs for defined benefit plans	0	2	0	2
Tax effect of net actuarial gain for defined benefit plans	0	(30)	0	(30)
Tax effect of available-for-sale securities reclassified from accumulated other comprehensive income (loss)	3	1	2	2
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	3	4	5	7
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss)	$ (2)	$ (3)	$ (4)	$ (6)