Other Income (Expense) - net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income [Line Items]
Economic foreign currency exchange contracts	$ 384	$ 122	$ 121
Interest income	3	4	1
Allowance for funds used during construction - equity component	19	14	11
Miscellaneous	6	6	7
Total Other Income	412	146	140
Other Expense [Line Items]
Charitable contributions	9	21	27
Miscellaneous	13	17	8
Total Other Expense	22	38	35
Other Income (Expense) - net	390	108	105
PPL Electric Utilities Corp [Member]
Other Expense [Line Items]
Other Income (Expense) - net	17	8	7
LG And E And KU Energy LLC [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(9)	(8)	(9)
Louisville Gas And Electric Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	(5)	(6)	(3)
Kentucky Utilities Co [Member]
Other Expense [Line Items]
Other Income (Expense) - net	$ (5)	$ 1	$ (1)