Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Income [Line Items]
Earnings on securities in nuclear decommissioning trust funds	$ 6	$ 5	$ 12	$ 10
Interest income	3		4	1
Allowance for funds used during construction - equity component	2	2	5	5
Miscellaneous - Domestic	2	7	4	9
Miscellaneous - United Kingdom				1
Other income	13	14	25	26
Other Expense [Line Items]
Economic foreign currency exchange contracts	72	(4)	96	(123)
Charitable contributions	2	4	9	8
Spinoff of PPL Energy Supply transaction costs	16		16
Miscellaneous - Domestic	5	1	8	5
Miscellaneous - United Kingdom			1	1
Other expense	95	1	130	(109)
Other Income (Expense) - net	(82)	13	(105)	135
PPL Energy Supply LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	8	12	14	16
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	1	2	3	3
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(2)		(4)	(2)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(1)	(3)	(2)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net		$ 2		$ 1