Preferred Securities (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Oct. 31, 2013
Preferred Securities [Line Items]
Value of stock redeemed including accumulated dividends	$ 0	$ 0	$ 250
Preferred Stock [Member]
Preferred Securities [Line Items]
Shares authorized	10,000,000
Preference Stock [Member]
Preferred Securities [Line Items]
Aggregate value of stock redeemed				250
PPL Electric Utilities Corp [Member]
Preferred Securities [Line Items]
Dividend requirements on noncontrolling interests			4
Value of stock redeemed including accumulated dividends	$ 0	$ 0	$ 250
PPL Electric Utilities Corp [Member] | Preferred Stock [Member]
Preferred Securities [Line Items]
Shares authorized	20,629,936
PPL Electric Utilities Corp [Member] | Preference Stock [Member]
Preferred Securities [Line Items]
Shares authorized					10,000,000
Percentage rate on stock				6.25%
PPL Electric Utilities Corp [Member] | Series Preference Stock [Member]
Preferred Securities [Line Items]
Number of shares of stock redeemed				2,500,000
Par value of stock				$ 100
Louisville Gas And Electric Co [Member] | Preferred Stock [Member]
Preferred Securities [Line Items]
Shares authorized	1,720,000
Par value of stock	$ 25
Louisville Gas And Electric Co [Member] | Preferred Stock Without Par Value [Member]
Preferred Securities [Line Items]
Shares authorized	6,750,000
No par value of stock
Kentucky Utilities Co [Member] | Preferred Stock Without Par Value [Member]
Preferred Securities [Line Items]
Shares authorized	5,300,000
No par value of stock
Kentucky Utilities Co [Member] | Preference Stock Without Par Value [Member]
Preferred Securities [Line Items]
Shares authorized	2,000,000
No par value of stock