Financing Activities (Long-term Debt and Equity Securities) (Details) In Millions, except Share data, unless otherwise specified	1 Months Ended		9 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended
	Jul. 31, 2013 USD ($)	May 31, 2013 Integer	Sep. 30, 2013 USD ($)		Sep. 30, 2012 USD ($)	Sep. 30, 2013 Equity Units 2011 [Member] USD ($)	May 31, 2013 Junior Subordinated Notes [Member] USD ($)	Jun. 30, 2013 PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Senior Unsecured Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Senior Unsecured Notes [Member] USD ($)	May 31, 2013 PPL Capital Funding [Member] Senior Unsecured Notes [Member] USD ($)	Feb. 28, 2013 PPL Energy Supply [Member] Senior Unsecured Notes [Member] USD ($)	Feb. 28, 2013 PPL Ironwood [Member] Senior Secured Notes [Member] USD ($)	Jul. 31, 2013 PPL Electric Utilities Corporation [Member] First Mortgage Bonds [Member] USD ($)	Oct. 31, 2013 WPD East Midlands [Member] Index Linked Senior Unsecured Notes [Member] USD ($)	Oct. 31, 2013 WPD East Midlands [Member] Index Linked Senior Unsecured Notes [Member] GBP (£)	Sep. 30, 2013 WPD East Midlands [Member] Index Linked Senior Unsecured Notes [Member] USD ($)	Sep. 30, 2013 WPD East Midlands [Member] Index Linked Senior Unsecured Notes [Member] GBP (£)	Oct. 31, 2013 WPD West Midlands [Member] Senior Unsecured Notes [Member] USD ($)	Oct. 31, 2013 WPD West Midlands [Member] Senior Unsecured Notes [Member] GBP (£)	Feb. 28, 2013 PPL Energy Supply LLC [Member] Senior Unsecured Notes [Member] USD ($)	Feb. 28, 2013 PPL Energy Supply LLC [Member] PPL Ironwood [Member] Senior Secured Notes [Member] USD ($)	Jul. 31, 2013 PPL Electric Utilities Corp [Member] First Mortgage Bonds [Member] USD ($)	May 31, 2013 Forward Sale Agreement [Member] USD ($)	Apr. 30, 2013 Forward Sale Agreement [Member] USD ($)	Apr. 30, 2012 Forward Sale Agreement [Member] Integer
Equity Securities (Numeric) [Abstract]
Number of shares of common stock repurchased			2,400,000
Repurchase of common stock due to the repurchase program			$ 74
Shares of PPL common stock issued	40,000,000
Price per share of PPL common stock issued	$ 28.73
Equity Sale Agreement [Line Items]
Number of shares of common stock covered by a forward contract																													9,900,000
Number of counterparties involved in the sale agreements																													2
Additional shares to cover over-allotments covered by a forward contract																													591,000
Settlement date of forward sale agreements																											May 31, 2013	Apr. 30, 2013
Shares physically delivered relating to forward sale agreements																												8,400,000
Shares cash settled relating to forward sale agreements																											591,000	1,500,000
Initial forward price used to calculate the forward sale price																												$ 27.02
Cash settlement of equity forward agreements			13	[1]																							(4)
Net cash received on stock transaction	1,150																											205
Long-term Debt (Numeric) [Abstract]
Principal amount								450	1,150	300	850	250	600	300	212		350		25		40		400	212		350
Stated interest rate								5.90%	4.625%	2.04%	2.77%	1.90%	3.40%	4.70%	4.60%	8.857%	4.75%	1.676%	1.676%	1.676%	1.676%	3.875%	3.875%	4.60%	8.857%	4.75%
Maturity date (in year)								Apr. 30, 2073	Jul. 01, 2018	Jun. 01, 2016	Jun. 01, 2018	Jun. 01, 2018	Jun. 01, 2023	Jun. 01, 2043	Dec. 15, 2021	Nov. 30, 2025	Jul. 15, 2043	Sep. 24, 2052	Sep. 24, 2052	Sep. 24, 2052	Sep. 24, 2052	Oct. 17, 2024	Oct. 17, 2024	Dec. 15, 2021	Nov. 30, 2025	Jul. 15, 2043
Net proceeds from issuance of unsecured debt								436										40	25	64	40	637	394
Proceeds from issuance of secured debt																	345									345
Principal amount of debt exchanged																167									167
Number of tranches of debt entered into relating to the debt extinguishment		3
Interest payments relating to debt extinguishment costs							10
Equity Units [Line Items]
Aggregate value of Equity Units expected to be remarketed						$ 978

[1] See Note 7 for additional information.