Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income [Line Items]
Earnings on securities in nuclear decommissioning trust funds	$ 4	$ 5	$ 14	$ 17
Interest income	1	1	2	4
Allowance for funds used during construction - equity component	3	2	8	7
Earnings (losses) from equity method investments		(1)		(7)
Miscellaneous - Domestic		3	9	8
Miscellaneous - United Kingdom		(1)	1	1
Other income	8	9	34	30
Other Expense [Line Items]
Economic foreign currency exchange contracts	117	47	(6)	40
Charitable contributions	5	1	13	7
Miscellaneous - Domestic	2	4	7	12
Miscellaneous - United Kingdom		1	1	2
Other expense	124	53	15	61
Other Income (Expense) - net	(116)	(44)	19	(31)
PPL Energy Supply LLC [Member]
Other Income [Line Items]
Earnings on securities in nuclear decommissioning trust funds	4	5	14	17
Interest income	1		3	1
Miscellaneous - Domestic		2	7	5
Other income	5	7	24	23
Other Expense [Line Items]
Charitable contributions	1	1	3	2
Miscellaneous - Domestic	2	1	3	5
Other expense	3	2	6	7
Other Income (Expense) - net	2	5	18	16
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	2	3	5	6
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(4)	(4)	(6)	(14)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(3)	(3)	(3)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (2)	$ 1	$ (1)	$ (5)