Other Income (Expense) - net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Expense [Line Items]
Other Income (Expense) - net	$ 61	$ 88
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	3	2
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(1)	(1)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	0	(1)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (2)	$ (1)