Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Income [Line Items]
Earnings on securities in nuclear decommissioning trust funds	$ 6	$ 5
Interest income	1	1
Allowance for funds used during construction - equity component	3	3
Miscellaneous - Domestic	2	2
Miscellaneous - United Kingdom		1
Other income	12	12
Other Expense [Line Items]
Economic foreign currency exchange contracts	24	(119)
Charitable contributions	7	4
Miscellaneous - Domestic	3	4
Miscellaneous - United Kingdom	1	1
Other expense	35	(110)
Other Income (Expense) - net	(23)	122
PPL Energy Supply LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	6	4
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	2	1
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(2)	(2)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(2)	(1)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net		$ (1)