Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income [Line Items]
Other income	$ 14	$ 10	$ 26	$ 21
Other Expense [Line Items]
Other expense	1	(20)	(109)	8
Other Income (Expense) - net	13	30	135	13
Economic Foreign Currency Exchange Contracts [Member]
Other Expense [Line Items]
Other expense	(4)	(25)	(123)	(7)
Charitable Contributions [Member]
Other Expense [Line Items]
Other expense	4	2	8	6
Miscellaneous Domestic Other Expense [Member]
Other Expense [Line Items]
Other expense	1	4	5	8
Miscellaneous UK Other Expense [Member]
Other Expense [Line Items]
Other expense		(1)	1	1
Earnings On Securities In Nuclear Decommissioning Trust Funds [Member]
Other Income [Line Items]
Other income	5	4	10	12
Interest Income [Member]
Other Income [Line Items]
Other income		2	1	3
Allowance For Funds Used During Construction Equity Component [Member]
Other Income [Line Items]
Other income	2	3	5	5
Earnings Losses From Equity Method Investments [Member]
Other Income [Line Items]
Other income		(4)		(6)
Miscellaneous Domestic Other Income [Member]
Other Income [Line Items]
Other income	7	3	9	5
Miscellaneous UK Other Income [Member]
Other Income [Line Items]
Other income		2	1	2
PPL Energy Supply LLC [Member]
Other Income [Line Items]
Other income	13	7	19	16
Other Expense [Line Items]
Other expense	1	1	3	5
Other Income (Expense) - net	12	6	16	11
PPL Energy Supply LLC [Member] | Charitable Contributions [Member]
Other Expense [Line Items]
Other expense	1		2	1
PPL Energy Supply LLC [Member] | Miscellaneous Domestic Other Expense [Member]
Other Expense [Line Items]
Other expense		1	1	4
PPL Energy Supply LLC [Member] | Earnings On Securities In Nuclear Decommissioning Trust Funds [Member]
Other Income [Line Items]
Other income	5	4	10	12
PPL Energy Supply LLC [Member] | Interest Income [Member]
Other Income [Line Items]
Other income	2	1	2	1
PPL Energy Supply LLC [Member] | Miscellaneous Domestic Other Income [Member]
Other Income [Line Items]
Other income	6	2	7	3
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	2	1	3	3
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net		(7)	(2)	(10)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(1)	(2)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ 2	$ (5)	$ 1	$ (6)