Financing Activities (Credit Arrangements and ST Debt) (Details)					9 Months Ended			9 Months Ended				9 Months Ended										9 Months Ended						9 Months Ended			1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended					9 Months Ended				9 Months Ended							9 Months Ended								9 Months Ended					1 Months Ended	9 Months Ended			0 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] USD ($)		Dec. 31, 2010 PPL Energy Supply Domestic Credit Facilities [Member] USD ($)		Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] Expired Facility [Member] Structured Credit Facility [Member] USD ($)	Dec. 31, 2010 PPL Energy Supply Domestic Credit Facilities [Member] Expired Facility [Member] Structured Credit Facility [Member] USD ($)		Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2010 PPL Energy Supply Domestic Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] PPL Energy Supply Securred Trading Facility [Member] USD ($)	Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] PPL Energy Supply Facility Agreement [Member] USD ($)	Sep. 30, 2011 PPL Energy Supply Domestic Credit Facilities [Member] Letter Of Credit Facility [Member] USD ($)	Dec. 31, 2010 PPL Energy Supply Domestic Credit Facilities [Member] Letter Of Credit Facility [Member] USD ($)	Sep. 30, 2011 WPD Credit Facilities [Member] USD ($)		Sep. 30, 2011 WPD Credit Facilities [Member] GBP (£)		Dec. 31, 2010 WPD Credit Facilities [Member] GBP (£)		Sep. 30, 2011 WPD Credit Facilities [Member] PPL WW Five Year Syndicated Credit Facility [Member] GBP (£)		Dec. 31, 2010 WPD Credit Facilities [Member] PPL WW Five Year Syndicated Credit Facility [Member] GBP (£)		Sep. 30, 2011 WPD Credit Facilities [Member] PPL WW Five Year Syndicated Credit Facility [Member] USD Denominated Borrowing [Member] USD ($)	Sep. 30, 2011 WPD Credit Facilities [Member] PPL WW Five Year Syndicated Credit Facility [Member] GBP Denominated Borrowing [Member] GBP (£)	Sep. 30, 2011 WPD Credit Facilities [Member] WPD South West 3 Year Syndicated Credit Facility [Member] GBP (£)	Sep. 30, 2011 WPD Credit Facilities [Member] Uncommitted Credit Facilities [Member] GBP (£)	Dec. 31, 2010 WPD Credit Facilities [Member] Uncommitted Credit Facilities [Member] GBP (£)	Apr. 30, 2011 WPD Credit Facilities [Member] WPD East Midlands Syndicated Credit Facility [Member] GBP (£)	Sep. 30, 2011 WPD Credit Facilities [Member] WPD East Midlands Syndicated Credit Facility [Member] GBP (£)		Apr. 30, 2011 WPD Credit Facilities [Member] WPD West Midlands Syndicated Credit Facility [Member] GBP (£)	Sep. 30, 2011 WPD Credit Facilities [Member] WPD West Midlands Syndicated Credit Facility [Member] GBP (£)		Apr. 30, 2011 WPD Credit Facilities [Member] WPD (East Midlands) And (West Midlands) Combined Syndicated Credit Facility [Member] USD ($)	Sep. 30, 2011 PPL Electric Credit Facilities [Member] USD ($)		Dec. 31, 2010 PPL Electric Credit Facilities [Member] USD ($)		Sep. 30, 2011 PPL Electric Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2010 PPL Electric Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Sep. 30, 2011 PPL Electric Credit Facilities [Member] Asset Backed Credit Facility [Member] USD ($)		Dec. 31, 2010 PPL Electric Credit Facilities [Member] Asset Backed Credit Facility [Member] USD ($)	Sep. 30, 2011 LGE Credit Facilities [Member] USD ($)		Dec. 31, 2010 LGE Credit Facilities [Member] USD ($)		Sep. 30, 2011 LGE Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2010 LGE Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Sep. 30, 2011 KU Credit Facilities [Member] USD ($)		Dec. 31, 2010 KU Credit Facilities [Member] USD ($)		Sep. 30, 2011 KU Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Dec. 31, 2010 KU Credit Facilities [Member] Syndicated Credit Facility [Member] USD ($)		Apr. 30, 2011 KU Credit Facilities [Member] KU Letter Of Credit Facility [Member]	Apr. 30, 2011 KU Credit Facilities [Member] Letter Of Credit Facility [Member]	Sep. 30, 2011 KU Credit Facilities [Member] Letter Of Credit Facility [Member] USD ($)		Sep. 30, 2011 PPL Electric Commercial Paper [Member] USD ($)	Nov. 04, 2011 PPL Energy Supply Commercial Paper [Member] Short Term Debt Activity Subsequent To Period End [Member] USD ($)	Oct. 31, 2011 PPL Energy Supply Commercial Paper [Member] Short Term Debt Activity Subsequent To Period End [Member] USD ($)	Sep. 30, 2011 Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] USD ($)	Sep. 30, 2011 Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	Apr. 30, 2011 PPL Capital Funding Bridge Loan [Member] Expired Short Term Debt Facility [Member] USD ($)	Apr. 30, 2011 PPL Capital Funding Bridge Loan [Member] Expired Short Term Debt Facility [Member] GBP (£)	May 31, 2011 PPL WEM Bridge Loan [Member] Expired Short Term Debt Facility [Member] GBP (£)	Apr. 30, 2011 PPL WEM Bridge Loan [Member] Expired Short Term Debt Facility [Member] GBP (£)
Credit Arrangements Details [Abstract]
Expiration date					March 2011			December 2014				November 2015	June 2017	March 2013								January 2013						July 2012				April 2016			April 2016							December 2014				July 2012							December 2014								December 2014						April 2014
Capacity	$ 3,200,000,000	[1]			$ 300,000,000			$ 3,000,000,000	[2]			$ 800,000,000		$ 200,000,000				£ 1,041,000,000	[3]			£ 150,000,000						£ 210,000,000	£ 81,000,000			£ 300,000,000	[4]		£ 300,000,000	[4]		$ 350,000,000	[1]			$ 200,000,000	[2]			$ 150,000,000	[5]		$ 400,000,000	[1],[6],[7]			$ 400,000,000	[1],[2],[6],[7]			$ 598,000,000	[1],[6]			$ 400,000,000	[2],[7]					$ 198,000,000	[8]
Borrowed	250,000,000	[1],[10],[9]	350,000,000	[1],[9]				250,000,000	[10],[2],[9]	350,000,000	[2],[9]							111,000,000	[11],[3],[9]	115,000,000	[9]	111,000,000	[11],[9]	115,000,000	[9]	178,000,000	111,000,000																								163,000,000	[1],[6],[9]			163,000,000	[1],[2],[6],[9]
Letters of credit issued	208,000,000	[1]	185,000,000	[1]		161,000,000	[12]	132,000,000	[2]					76,000,000	24,000,000			144,000,000	[3]	3,000,000									3,000,000	3,000,000		70,000,000	[4]		71,000,000	[4]		13,000,000	[1]	13,000,000	[1]	13,000,000	[2]	13,000,000	[2]												198,000,000	[1],[6]	198,000,000	[1],[6]			198,000,000	[2]			198,000,000	[8]
Unused capacity	2,742,000,000	[1]						2,618,000,000	[2]					124,000,000		1,300,000,000	[3]	786,000,000	[3]			39,000,000						210,000,000	78,000,000			230,000,000	[4]		229,000,000	[4]		337,000,000	[1]			187,000,000	[2]			150,000,000	[5]		400,000,000	[1],[6],[7]			400,000,000	[1],[2],[6],[7]			400,000,000	[1],[6]			400,000,000	[2],[7]
Maximum amount of letters of credit that may be issued under credit facility																															80,000,000			80,000,000
Amount of letter of credit issued that supports this credit facility					300,000,000
Capacity of seperate credit agreement which supports this credit facility					300,000,000
Expiration date of separate credit agreement which supports this credit facility					March 2011
Maximum percentage of debt to total capitalization allowed under the credit facility (in hundredths)																																																																	70.00%
Interest rate on outstanding borrowing (in hundredths)																						1.05%
Weighted-average interest rate on outstanding borrowings (in hundredths)								2.48%
Accounts receivable pledged under PPL Electric's asset-backed credit facility																																														253,000,000		248,000,000
Unbilled revenue pledged under PPL Electric's asset-backed credit facility																																														81,000,000		134,000,000
Potential maximum Facility Agreement capacity													500,000,000
Origination date																															April 2011			April 2011																																April 2011
Maximum percentage of total net debt to RAV allowed under the credit facility (in hundreths)																															85.00%			85.00%
Minimum interest coverage ratio allowed under the credit facility																															at least 3.0 to 1			at least 3.0 to 1
Automatic renewal term (in years)												1
Available capacity under PPL Electric asset-backed credit facility																																														86,000,000
Deferred fees																																					7,000,000
Short-term Debt [Line Items]
Capacity																																																																					200,000,000		500,000,000
Original committed capacity of Bridge Facility																																																																									3,600,000,000
Deferred financing costs associated with Bridge Facility																																																																								43,000,000
Interest rate on facility (in hundredths)																																																																										2.62%	2.62%		2.62%
Libor rates for borrowings																																																																								one-month LIBOR plus a spread
Borrowings during period on short-term facility																																																																											1,750,000,000		1,850,000,000
Repayments during period on short-term facility																																																																										2,800,000,000	1,750,000,000	1,200,000,000	650,000,000
Commercial paper outstanding																																																																						$ 400,000,000
Weighted-average interest rate on outstanding commercial paper (in hundreths)																																																																						0.51%

[1] All credit facilities at PPL Energy Supply, PPL Electric, LG&E and KU also apply to PPL on a consolidated basis for financial reporting purposes.

[2] In October 2011, PPL Energy Supply, PPL Electric, LG&E and KU each amended its respective syndicated credit facility. The amendments include extending the expiration dates from December 2014 to October 2016. Under these facilities, PPL Energy Supply, PPL Electric, LG&E and KU each continue to have the ability to make cash borrowings and to request the lenders to issue letters of credit.

[3] At September 30, 2011, the unused capacity of the WPD credit facilities was approximately $1.3 billion.

[4] In April 2011, following the completion of the acquisition of WPD Midlands, WPD (East Midlands) and WPD (West Midlands) each entered into a £300 million 5-year syndicated credit facility. Under the facilities, WPD (East Midlands) and WPD (West Midlands) each have the ability to make cash borrowings and to request the lenders to issue up to £80 million of letters of credit in lieu of borrowing. Each company pays customary commitment and utilization fees under its respective facility, and borrowings generally bear interest at LIBOR-based rates plus a spread, depending upon the respective company's senior unsecured long-term debt rating. Each credit facility contains financial covenants that require the respective company to maintain an interest coverage ratio of consolidated earnings before interest, income taxes, depreciation and amortization to interest expense of at least 3.0 to 1 and total net debt not in excess of 85% of its RAV, in each case calculated in accordance with the credit facilities. An aggregate of $7 million in fees were incurred in connection with establishing these facilities.

[5] PPL Electric participates in an asset-backed commercial paper program through which PPL Electric obtains financing by selling and contributing its eligible accounts receivable and unbilled revenue to a special purpose, wholly owned subsidiary on an ongoing basis. The subsidiary has pledged these assets to secure loans from a commercial paper conduit sponsored by a financial institution.         At September 30, 2011 and December 31, 2010, $253 million and $248 million of accounts receivable and $81 million and $134 million of unbilled revenue were pledged by the subsidiary under the credit agreement related to PPL Electric's and the subsidiary's participation in the asset-backed commercial paper program. Based on the accounts receivable and unbilled revenue pledged at September 30, 2011, the amount available for borrowing under the facility was limited to $86 million. PPL Electric's sale to its subsidiary of the accounts receivable and unbilled revenue is an absolute sale of assets, and PPL Electric does not retain an interest in these assets. However, for financial reporting purposes, the subsidiary's financial results are consolidated in PPL Electric's financial statements. PPL Electric performs certain record-keeping and cash collection functions with respect to the assets in return for a servicing fee from the subsidiary.         In July 2011, PPL Electric and the subsidiary extended the expiration date of the credit agreement to July 2012.

[6] All credit facilities at LG&E and KU also apply to LKE on a consolidated basis for financial reporting purposes.

[7] In June 2011, these facilities were amended such that the fees and the spreads to benchmark interest rates for borrowings depend upon the respective company's senior secured long-term debt rating rather than the senior unsecured long-term debt rating.

[8] In April 2011, KU entered into a letter of credit facility that has been used to issue letters of credit to support outstanding tax-exempt bonds. The facility contains a financial covenant requiring KU's debt to total capitalization not to exceed 70%, as calculated in accordance with the credit facility. KU pays customary commitment and letter of credit fees under the new facility. In August 2011, KU amended its letter of credit facility such that the fees depend upon KU's senior secured long-term debt rating rather than its senior unsecured debt rating.

[9] Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.

[10] The borrowings outstanding at September 30, 2011 bear interest at a weighted average rate of approximately 2.48%.

[11] The borrowing outstanding at September 30, 2011 was a USD-denominated borrowing of $178 million, which equated to £111 million at the time of borrowing and bore interest at approximately 1.05%.

[12] In March 2011, PPL Energy Supply's $300 million Structured Credit Facility expired. PPL Energy Supply's obligations under this facility were supported by a $300 million letter of credit issued on PPL Energy Supply's behalf under a separate but related $300 million 5-year credit agreement, which also expired in March 2011.