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 foreign currency translation adjustments arising during the period	$ (3)	$ (9)	$ (2)	$ (3)
Tax effect of available-for-sale securities arising during the period	0	1	(9)	(20)
Tax effect of qualifying derivatives arising during the period	11	2	4	31
Tax effect of defined benefit plans - prior service costs arising during period	0	0	4	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	(1)	(36)	1
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)	(3)	3	(23)	4
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss)	0	0	1	0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	(1)	0	(3)
Tax effect of net actuarial loss reclassified from accumulated other comprehensive income (loss)	(10)	(9)	(35)	(26)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	0	5	1
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss)	0	0	1	0
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)	$ 0	$ 0	$ (1)	$ 0