CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income	$ 449	$ 253	$ 1,054	$ 600
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax	(4)	81	156	(79)
Available-for-sale securities, net of tax	(26)	19	(13)	12
Qualifying derivatives, net of tax	41	134	48	360
Equity investees' other comprehensive income (loss), net of tax	0	0	(1)	0
Defined benefit plans:
Prior service costs, net of tax	0	17	0	17
Net actuarial gain (loss), net of tax	1	(17)	1	63
Transition obligation, net of tax	0	7	0	7
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	2	1	(6)	(3)
Qualifying derivatives, net of tax	(94)	26	(252)	(41)
Equity investee's other comprehensive income (loss)	0	0	3	0
Defined benefit plans:
Prior service costs, net of tax	2	2	7	9
Net actuarial loss, net of tax	13	9	36	30
Transition obligation, net of tax	0	0	0	2
Total other comprehensive income (loss)	(65)	279	(21)	377
Comprehensive income (loss)	384	532	1,033	977
Comprehensive income attributable to noncontrolling interests	5	5	13	17
Comprehensive income (loss) attributable to PPL Corporation	379	527	1,020	960
PPL Energy Supply [Member]
Net income	170	266	473	552
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax	0	81	0	(79)
Available-for-sale securities, net of tax	(26)	19	(13)	12
Qualifying derivatives, net of tax	39	207	68	492
Defined benefit plans:
Prior service costs, net of tax	0	12	0	12
Net actuarial gain (loss), net of tax	1	(13)	1	67
Transition obligation, net of tax	0	6	0	6
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	2	1	(6)	(3)
Qualifying derivatives, net of tax	(73)	9	(220)	(59)
Equity investee's other comprehensive income (loss)	0	0	3	0
Defined benefit plans:
Prior service costs, net of tax	1	1	3	6
Net actuarial loss, net of tax	1	9	3	29
Transition obligation, net of tax	0	0	0	2
Total other comprehensive income (loss)	(55)	332	(161)	485
Comprehensive income (loss)	115	598	312	1,037
Comprehensive income attributable to noncontrolling interests	1	1	1	1
Comprehensive income (loss) attributable to PPL Corporation	114	597	311	1,036
PPL Electric [Member]
Net income	32	40	128	105
LKE [Member] | Successor [Member]
Net income	89		217
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Equity investees' other comprehensive income (loss), net of tax	1
Defined benefit plans:
Net actuarial loss, net of tax	(1)		(2)
Total other comprehensive income (loss)			(2)
Comprehensive income (loss)	89		215
LKE [Member] | Predecessor [Member]
Net income		102		194
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Qualifying derivatives, net of tax		11		10
Equity investees' other comprehensive income (loss), net of tax		(2)		(2)
Defined benefit plans:
Total other comprehensive income (loss)		9		8
Comprehensive income (loss)		111		202
LGE [Member] | Successor [Member]
Net income	43		102
Defined benefit plans:
Total other comprehensive income (loss)	0		0
Comprehensive income (loss)	43		102
LGE [Member] | Predecessor [Member]
Net income		60		107
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Qualifying derivatives, net of tax		13		10
Defined benefit plans:
Total other comprehensive income (loss)		13		10
Comprehensive income (loss)		73		117
KU [Member] | Successor [Member]
Net income	56		144
Defined benefit plans:
Total other comprehensive income (loss)	1
KU [Member] | Predecessor [Member]
Net income		54		129
Defined benefit plans:
Total other comprehensive income (loss)		$ (2)		$ (2)