Other Income (Expense) - net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income [Line Items]
Interest income	$ 4	$ 1	$ 0
Allowance for funds used during construction - equity component	14	11	10
Miscellaneous	6	7	4
Other income	24	19	14
Other Expense [Line Items]
Economic foreign currency exchange contracts	(122)	(121)	38
Charitable contributions	21	27	21
Miscellaneous	17	8	10
Other expense	(84)	(86)	69
Other Income (Expense) - net	108	105	(55)
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	8	7	6
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(8)	(9)	(7)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(6)	(3)	(2)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ 1	$ (1)	$ (3)