Commitments and Contingencies (Guarantees and Other Assurances) (Details) (USD $)			6 Months Ended							6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 PPL Guarantee [Member] Indemnification Guarantee [Member] Indemnifications For Sale Of PPL Gas Utilities [Member]	Jun. 30, 2011 PPL Guarantee [Member] Indemnification Guarantee [Member] Indemnifications Issued By LKE [Member]	Jun. 30, 2011 PPL Guarantee [Member] Indemnification Guarantee [Member] Indemnifications For Entities In Liquidation Sales Of Assets [Member]	Jun. 30, 2011 PPL Guarantee [Member] Performance Guarantee [Member] WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member]	Jun. 30, 2011 PPL Guarantee [Member] Performance Guarantee [Member] Tax Indemnification Related To Unconsolidated WPD Affiliates [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Indemnification Guarantee [Member] Retroactive Premiums Under Nuclear Insurance Programs [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Indemnification Guarantee [Member] Nuclear Claims Under Price Anderson Act Amendments Under Energy Policy Act of 2005 [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Indemnification Guarantee [Member] Indemnification To Operators Of Jointly Owned Facilities [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Indemnification Guarantee [Member] Indemnifications For Sales Of Assets [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Performance Guarantee [Member] Indemnification To Operators Of Jointly Owned Facilities [Member]	Jun. 30, 2011 PPL Energy Supply Guarantee [Member] Financial Guarantee [Member] Guarantee Of Portion Of Unconsolidated Entitys Debt [Member]
Guarantor Obligations [Line Items]
Recorded liability for all guarantees	$ 16,000,000	$ 14,000,000
Maximum exposure			300,000,000	301,000,000	297,000,000	68,000,000	8,000,000	44,000,000	235,000,000		338,000,000	6,000,000	22,000,000
Expiration date						2015	2012						2018
Expiration date minimum				2021	2013						2012
Expiration date maximum				2023	2018						2025
Minimum amount of individual claim that requires guarantor to perform			50,000
Maximum dollar amount for certain indemnification provisions			45,000,000
Threshold of total claims that requires guarantor to perform			4,500,000
Minimum term of unknown environmental liabilities indemnifications (in years)			3
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues				200,000,000
Term of guarantee (in years)				12
Maximum exposure of other guarantees expiring related to a terminated lease				100,000,000
Minimum period that indemnifications generally expire (in years)					2
Maximum period that indemnifications generally expire (in years)					7
Number of subsidiaries or affiliates involved in an indemnification transaction							2			2
Number of subsidiaries that previously owned certain renewable energy facilities											1
Aggregate current maximum exposure for all owners of each jointly owned facilities												20,000,000
Equity interest in previously owned facility (in hundredths)													33.00%
Other Guarantee (Numeric) [Abstract]
Deductible for bodily injury and property damage	4,000,000
Maximum aggregate coverage bodily injury and property damage	$ 200,000,000