Other Income (Expense) - net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Income [Line Items]
Earnings on securities in nuclear decommissioning trust funds	$ 11	$ 4	$ 23	$ 14
Interest income	0	1	4	2
Allowance for funds used during construction - equity component	3	3	8	8
Miscellaneous - Domestic	4	0	8	10
Other income	18	8	43	34
Other Expense [Line Items]
Economic foreign currency exchange contracts	(134)	117	(38)	(6)
Charitable contributions	3	5	12	13
Spinoff of PPL Energy Supply transaction costs	2		18
Miscellaneous - Domestic	3	3	13	9
Other expense	(126)	125	5	16
Other Income (Expense) - net	144	(117)	38	18
PPL Energy Supply LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	10	1	23	17
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	3	2	6	5
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(2)	(4)	(6)	(6)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	0	(1)	(3)	(3)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (1)	$ (2)	$ (1)	$ (1)