Financing Activities (Long-term Debt and Equity Securities) (Details) In Millions, except Share data, unless otherwise specified	1 Months Ended			6 Months Ended	1 Months Ended		6 Months Ended
	Apr. 30, 2012 USD ($) Integer	Jul. 31, 2012 US [Member] PPL Capital Funding [Member] Senior Unsecured Notes [Member] USD ($)	Jun. 30, 2012 US [Member] PPL Capital Funding [Member] Senior Unsecured Notes [Member] USD ($)	Jun. 30, 2012 US [Member] PPL Electric [Member] USD ($)	Apr. 30, 2012 UK [Member] WPD East Midlands [Member] Senior Unsecured Notes [Member] USD ($)	Apr. 30, 2012 UK [Member] WPD East Midlands [Member] Senior Unsecured Notes [Member] GBP (£)	Jun. 30, 2012 PPL Electric Utilities Corp [Member] US [Member] USD ($)
Equity Securities (Numeric) [Abstract]
Stock issuance date	Apr. 30, 2012
Shares of common stock to be issued in a future period	9,900,000
Additional shares of common stock to be purchased by underwriters in a future period to cover over-allotments	591,000
Number of counterparties involved in the sale agreements	2
Number of shares of common stock covered by a forward contract	9,900,000
Additional shares to cover over-allotments covered by a forward contract	591,000
Settlement date of initial forward sale agreements	Apr. 30, 2013
Settlement date of subsequent forward sale agreements	Jul. 31, 2013
Initial forward price used to calculate the forward sale price	$ 27.02
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 99	$ 400			£ 100
Stated interest rate		6.85%	4.20%		5.25%	5.25%
Maturity date (in year)		Jul. 31, 2047	Jun. 30, 2022		Jan. 31, 2023	Jan. 31, 2023
Net proceeds from issuance of unsecured debt			396		178	111
Issuance date			June 2012		April 2012	April 2012
Number of shares of Preference Stock redeemed				2,500,000			2,500,000
Percentage rate on Preference Stock redeemed				6.25%			6.25%
Redemption value of Preference Stock redeemed (in dollars per share)				$ 100			$ 100
Date Preference Stock redeemed				Jun. 30, 2012			Jun. 30, 2012
Payment for the par value of Preference Stock redeemed				$ 250			$ 250