Other Income (Expense) - net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Expense [Line Items]
Other Income (Expense) - net	$ (102)	$ (74)	$ (14)	$ (103)
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	2	1	4	3
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(2)	(2)	(4)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(1)	(2)	(3)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ 2	$ 0	$ 1	$ 0