Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Income [Line Items]
Other income	$ 12	$ 13
Other Expense [Line Items]
Other expense	(110)	30
Other Income (Expense) - net	122	(17)
Economic Foreign Currency Exchange Contracts [Member]
Other Expense [Line Items]
Other expense	(119)	18
Charitable Contributions [Member]
Other Expense [Line Items]
Other expense	4	4
Miscellaneous Domestic Other Expense [Member]
Other Expense [Line Items]
Other expense	4	6
Miscellaneous UK Other Expense [Member]
Other Expense [Line Items]
Other expense	1	2
Earnings On Securities In Nuclear Decommissioning Trust Funds [Member]
Other Income [Line Items]
Other income	5	8
Interest Income [Member]
Other Income [Line Items]
Other income	1	1
Allowance For Funds Used During Construction Equity Component [Member]
Other Income [Line Items]
Other income	3	2
Miscellaneous Domestic Other Income [Member]
Other Income [Line Items]
Other income	2	2
Miscellaneous UK Other Income [Member]
Other Income [Line Items]
Other income	1
PPL Energy Supply LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	4	5
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	1	1
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(2)	(3)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	1
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (1)	$ (1)