CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 545	$ 405
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax	76	67
Available-for-sale securities, net of tax	22	12
Qualifying derivatives, net of tax	66	37
Equity investees' other comprehensive income (loss), net of tax	(4)	(1)
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(3)	(7)
Qualifying derivatives, net of tax	(122)	(69)
Equity investee's other comprehensive (income) loss, net of tax	0	2
Defined benefit plans:
Prior service costs, net of tax	3	3
Net actuarial loss, net of tax	20	11
Total other comprehensive income (loss)	58	55
Comprehensive income (loss)	603	460
Comprehensive income attributable to noncontrolling interests	4	4
Comprehensive income (loss) attributable to Company	599	456
PPL Energy Supply [Member]
Net income	309	214
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Available-for-sale securities, net of tax	22	12
Qualifying derivatives, net of tax	56	50
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(3)	(7)
Qualifying derivatives, net of tax	(139)	(79)
Equity investee's other comprehensive (income) loss, net of tax	0	2
Defined benefit plans:
Prior service costs, net of tax	1	1
Net actuarial loss, net of tax	5	1
Total other comprehensive income (loss)	(58)	(20)
Comprehensive income (loss) attributable to Company	251	194
PPL Electric [Member]
Net income	37	56
LKE [Member]
Net income	53	87
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Equity investees' other comprehensive income (loss), net of tax	(4)	(1)
Defined benefit plans:
Net actuarial loss, net of tax	0	(1)
Total other comprehensive income (loss)	(4)	(2)
Comprehensive income (loss)	49	85
LGE [Member]
Net income	25	39
KU [Member]
Net income	38	58
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Equity investees' other comprehensive income (loss), net of tax	(4)	(1)
Defined benefit plans:
Total other comprehensive income (loss)	(4)	(1)
Comprehensive income (loss)	$ 34	$ 57