Financing Activities (LT Debt and Equity Securities) (Details)	1 Months Ended		12 Months Ended					1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				12 Months Ended																																				1 Months Ended			12 Months Ended				1 Months Ended					12 Months Ended	1 Months Ended		12 Months Ended			12 Months Ended							12 Months Ended							12 Months Ended						12 Months Ended						1 Months Ended			1 Months Ended		12 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended
	Apr. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2011 USD ($)		Dec. 31, 2010 USD ($)		Dec. 31, 2009 USD ($)	Apr. 30, 2011 Equity Units 2011 [Member] USD ($) EquityUnits	Dec. 31, 2011 Equity Units 2011 [Member] USD ($)	Jun. 30, 2010 Equity Units 2010 [Member] USD ($) EquityUnits	Dec. 31, 2011 Equity Units 2010 [Member] USD ($)	Dec. 31, 2010 Equity Units 2010 [Member] USD ($)	Dec. 31, 2011 US [Member] USD ($)	Dec. 31, 2010 US [Member] USD ($)	Dec. 31, 2011 US [Member] Senior Unsecured Notes [Member] USD ($)		Dec. 31, 2010 US [Member] Senior Unsecured Notes [Member] USD ($)		Dec. 31, 2011 US [Member] Junior Subordinated Notes [Member] USD ($)		Dec. 31, 2010 US [Member] Junior Subordinated Notes [Member] USD ($)		Dec. 31, 2011 US [Member] Senior Secured Notes [Member] USD ($)		Dec. 31, 2010 US [Member] Senior Secured Notes [Member] USD ($)		Dec. 31, 2011 US [Member] 1945 First Mortgage Bonds [Member] USD ($)		Dec. 31, 2010 US [Member] 1945 First Mortgage Bonds [Member] USD ($)		Dec. 31, 2011 US [Member] Senior Secured - First Mortgage Bonds [Member] USD ($)		Dec. 31, 2010 US [Member] Senior Secured - First Mortgage Bonds [Member] USD ($)		Dec. 31, 2011 US [Member] Senior Secured Bonds (Pollution Control Series) [Member] USD ($)		Dec. 31, 2010 US [Member] Senior Secured Bonds (Pollution Control Series) [Member] USD ($)		Dec. 31, 2011 US [Member] Pollution Control Bonds (Collateral Series) [Member] USD ($)		Dec. 31, 2010 US [Member] Pollution Control Bonds (Collateral Series) [Member] USD ($)		Dec. 31, 2011 US [Member] Exempt Facilities Notes [Member] USD ($)		Dec. 31, 2010 US [Member] Exempt Facilities Notes [Member] USD ($)		Dec. 31, 2011 US [Member] Other [Member] USD ($)		Dec. 31, 2010 US [Member] Other [Member] USD ($)		Dec. 31, 2011 US [Member] PPL Energy Supply [Member] Senior Unsecured Notes [Member] USD ($)	Nov. 30, 2011 US [Member] PPL Energy Supply [Member] Senior Unsecured Notes [Member] USD ($)	Jul. 31, 2011 US [Member] PPL Energy Supply [Member] Senior Unsecured Notes [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Energy Supply [Member] Senior Unsecured Notes [Member] REset Put Securities [Member] USD ($)	Dec. 31, 2010 US [Member] PPL Energy Supply [Member] Exempt Facilities Notes [Member]	Dec. 31, 2011 US [Member] PPL Electric [Member] 1945 First Mortgage Bonds [Member] USD ($)	Dec. 31, 2010 US [Member] PPL Electric [Member] 1945 First Mortgage Bonds [Member] USD ($)	Aug. 31, 2011 US [Member] PPL Electric [Member] Senior Secured - First Mortgage Bonds [Member] First Mortgage Bonds [Member] USD ($)	Jul. 31, 2011 US [Member] PPL Electric [Member] Senior Secured - First Mortgage Bonds [Member] First Mortgage Bonds [Member] USD ($)	Jul. 31, 2011 US [Member] PPL Electric [Member] Senior Secured - First Mortgage Bonds [Member] Senior Secured Bonds [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Electric [Member] Senior Secured - First Mortgage Bonds [Member] 2001 Mortgage Indenture [Member] USD ($)	Dec. 31, 2010 US [Member] PPL Electric [Member] Senior Secured - First Mortgage Bonds [Member] 2001 Mortgage Indenture [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Electric [Member] Senior Secured Bonds (Pollution Control Series) [Member] Pollution Control Revenue Refunding Bonds [Member] USD ($)	Sep. 30, 2011 US [Member] LKE [Member] Senior Unsecured Notes [Member] USD ($)	Dec. 31, 2010 US [Member] LKE [Member] Senior Unsecured Notes [Member] USD ($)	Dec. 31, 2011 US [Member] LKE [Member] Pollution Control Bonds (Collateral Series) [Member] Tax Exempt Revenue Bonds [Member] USD ($)	Dec. 31, 2010 US [Member] LKE [Member] Pollution Control Bonds (Collateral Series) [Member] Tax Exempt Revenue Bonds [Member] USD ($)	Jan. 31, 2011 US [Member] LKE [Member] Pollution Control Bonds (Collateral Series) [Member] Tax Exempt Revenue Bonds [Member]	Dec. 31, 2011 US [Member] LKE [Member] Pollution Control Bonds (Collateral Series) [Member] Insured Auction Rate Securities [Member] USD ($)	Dec. 31, 2011 US [Member] LGE [Member] Senior Secured - First Mortgage Bonds [Member] 2010 Mortgage Indenture [Member] USD ($)	Dec. 31, 2010 US [Member] LGE [Member] Senior Secured - First Mortgage Bonds [Member] 2010 Mortgage Indenture [Member] USD ($)	Jan. 31, 2011 US [Member] LGE [Member] Pollution Control Bonds (Collateral Series) [Member] Tax Exempt Revenue Bonds [Member] USD ($)	Dec. 31, 2010 US [Member] LGE [Member] Pollution Control Bonds (Collateral Series) [Member] Tax Exempt Revenue Bonds [Member] USD ($)	Dec. 31, 2011 US [Member] KU [Member] Senior Secured - First Mortgage Bonds [Member] 2010 Mortgage Indenture [Member] USD ($)	Dec. 31, 2010 US [Member] KU [Member] Senior Secured - First Mortgage Bonds [Member] 2010 Mortgage Indenture [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	Dec. 31, 2010 US [Member] PPL Capital Funding [Member] Junior Subordinated Notes [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Capital Funding [Member] Junior Subordinated Notes [Member] 2018 Junior Subordinated Notes [Member] USD ($)	Dec. 31, 2010 US [Member] PPL Capital Funding [Member] Junior Subordinated Notes [Member] 2018 Junior Subordinated Notes [Member] USD ($)	Dec. 31, 2011 US [Member] PPL Capital Funding [Member] Junior Subordinated Notes [Member] 2019 Junior Subordinated Notes [Member] USD ($)	Dec. 31, 2011 UK [Member] USD ($)	Dec. 31, 2010 UK [Member] USD ($)	Dec. 31, 2011 UK [Member] Senior Unsecured Notes [Member] USD ($)		Dec. 31, 2010 UK [Member] Senior Unsecured Notes [Member] USD ($)		Dec. 31, 2010 UK [Member] Senior Unsecured Notes [Member] GBP (£)	Dec. 31, 2011 UK [Member] Senior Unsecured Notes [Member] GBP (£)	Dec. 31, 2011 UK [Member] Index-Linked Senior Unsecured Note [Member] USD ($)		Dec. 31, 2010 UK [Member] Index-Linked Senior Unsecured Note [Member] USD ($)		Dec. 31, 2011 UK [Member] WPD South West [Member] Index-Linked Senior Unsecured Note [Member] USD ($)	Dec. 31, 2011 UK [Member] WPD South West [Member] Index-Linked Senior Unsecured Note [Member] GBP (£)	May 31, 2011 UK [Member] WPD East Midlands And WPD West Midlands [Member] Senior Unsecured Notes [Member] USD ($)	May 31, 2011 UK [Member] WPD East Midlands And WPD West Midlands [Member] Senior Unsecured Notes [Member] GBP (£)	Apr. 30, 2011 UK [Member] WPD East Midlands And WPD West Midlands [Member] Senior Unsecured Notes [Member] Assumed Senior Unsecured Notes [Member] USD ($)	May 31, 2011 UK [Member] WPD East Midlands [Member] Senior Unsecured Notes [Member] GBP (£)	Apr. 30, 2011 UK [Member] WPD East Midlands [Member] Senior Unsecured Notes [Member] Assumed Senior Unsecured Notes [Member] GBP (£)	Dec. 31, 2011 UK [Member] WPD East Midlands [Member] Senior Unsecured Notes [Member] Assumed Senior Unsecured Notes [Member]	Jun. 30, 2011 UK [Member] WPD East Midlands [Member] Index-Linked Senior Unsecured Note [Member] USD ($)	Jun. 30, 2011 UK [Member] WPD East Midlands [Member] Index-Linked Senior Unsecured Note [Member] GBP (£)	Dec. 31, 2011 UK [Member] WPD East Midlands [Member] Index-Linked Senior Unsecured Note [Member]	May 31, 2011 UK [Member] WPD West Midlands [Member] Senior Unsecured Notes [Member] GBP (£)	Apr. 30, 2011 UK [Member] WPD West Midlands [Member] Senior Unsecured Notes [Member] Assumed Senior Unsecured Notes [Member] GBP (£)	Dec. 31, 2011 UK [Member] WPD West Midlands [Member] Senior Unsecured Notes [Member] Assumed Senior Unsecured Notes [Member]	Apr. 30, 2011 UK [Member] PPL WEM [Member] Senior Unsecured Notes [Member] USD ($)	Apr. 30, 2011 UK [Member] PPL WEM [Member] Senior Unsecured Notes [Member] 2016 Senior Unsecured Notes [Member] USD ($)	Apr. 30, 2011 UK [Member] PPL WEM [Member] Senior Unsecured Notes [Member] 2021 Senior Unsecured Notes [Member] USD ($)
Long-term Debt [Line Items]
Principal outstanding			$ 17,982,000,000		$ 12,604,000,000								$ 11,539,000,000	$ 10,313,000,000	$ 3,574,000,000	[1],[2],[3],[4]	$ 3,574,000,000	[1],[2],[3],[4]	$ 2,608,000,000	[5]	$ 1,630,000,000	[5]	$ 437,000,000	[6]	$ 437,000,000	[6]	$ 10,000,000	[7]	$ 10,000,000	[7]	$ 3,435,000,000	[8]	$ 3,185,000,000	[8]	$ 314,000,000	[9]	$ 314,000,000	[9]	$ 925,000,000	[10]	$ 925,000,000	[10]	$ 231,000,000	[11]	$ 231,000,000	[11]	$ 5,000,000	[12]	$ 7,000,000	[12]																$ 348,000,000			$ 231,000,000												$ 6,443,000,000	$ 2,291,000,000	$ 5,862,000,000	[13]	$ 1,897,000,000	[13]			$ 581,000,000	[14]	$ 394,000,000	[14]
Maturity date of long-term debt range start															2013		2011		2018		2018										2015		2013		2023		2023		2023		2023		2037		2037				2011																																		2016		2017		2017		2043		2053
Maturity date of long-term date range end			2047		2047														2067		2067										2041		2040		2029		2029		2037		2037		2038		2038				2020																																		2040		2040		2040		2056		2056
Maturity date																							Dec. 31, 2013		Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 2014																		Dec. 31, 2020						Dec. 31, 2046	Dec. 31, 2035				Dec. 31, 2021	Dec. 31, 2041	Dec. 31, 2013				Dec. 31, 2021														Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2019																		Dec. 31, 2023	Dec. 31, 2040		Dec. 31, 2043	Dec. 31, 2043		Dec. 31, 2032	Dec. 31, 2025			Dec. 31, 2016	Dec. 31, 2021
Minimum interest rate on long-term															2.125%		2.125%						8.05%		8.05%						1.625%		1.625%		4.00%		4.00%												6.00%																																		3.90%		4.80436%		4.80436%		1.541%
Maximum interest rate on long-term debt															6.85%		7.00%						8.30%		8.30%						6.45%		7.125%		4.75%		4.75%												7.471%																																		9.25%		9.25%		9.25%		2.671%
Stated interest rate																											7.375%		7.375%																		6.00%				4.60%	6.40%	7.00%	5.70%	3.00%			3.00%	5.20%	7.125%				4.375%												6.70%	6.70%	4.625%	4.625%	4.32%											1.541%							5.25%						5.75%				3.90%
Fair value adjustments from hedging activities			3,000,000		50,000,000
Fair value adjustments from purchase accounting			62,000,000	[15],[16]	38,000,000	[15],[16]
Unamortized premium			5,000,000		7,000,000
Unamortized discount			(59,000,000)		(36,000,000)
Total Long-term Debt			17,993,000,000	[17]	12,663,000,000
Less current portion of Long-term debt			0		502,000,000
Long-term Debt			17,993,000,000		12,161,000,000
Aggregate maturities of long-term debt (Numeric) [Abstract]
2012			0
2013			737,000,000
2014			310,000,000
2015			1,300,000,000
2016			810,000,000
Thereafter			14,825,000,000
Long-term Debt Additional Disclosures (Numberic) [Abstract]
Principal amount that may be redeemed at a future date																																																															224,000,000
Earliest date the company may redeem the debt at par															Jul. 31, 2012																																																Dec. 31, 2015													Mar. 31, 2017	Mar. 31, 2017
Principal amount															99,000,000																																				500,000,000			300,000,000				400,000,000	250,000,000					250,000,000	875,000,000											480,000,000	480,000,000	1,150,000,000	1,150,000,000	978,000,000																	800,000,000		250,000,000						250,000,000			460,000,000	500,000,000
Percentage of principal amount the remarketing dealer will pay if the REPS are purchased for remarketing																																																						100.00%
Issuance date																																																			December 2011							August 2011	July 2011	July 2011				September 2011																																		May 2011					June 2011	May 2011				April 2011
Principal amount of notes redeemed prior to maturity							250,000,000																																														250,000,000							400,000,000
Debt repayments during period at maturity																																																				500,000,000
Write-off of issuance costs																																																					7,000,000
Period prior to maturity that debt can be redeemed at make-whole redemption prices (in months)																																																			3							3	6
Proceeds from issuance of unsecured debt																																																			497,000,000													248,000,000																															2,200,000,000	1,400,000,000					163,000,000	99,000,000					953,000,000
Liquidated damages initial interest rate																																																																0.25%
Period, in days, incuding the date of default whereby liquidated damages will accrue																																																																90
Liquidated damages additional interest rate																																																																0.25%
Liquidated damages maximum interest rate																																																																0.50%
Fixed spread above LIBOR																																																																												2.665%	2.665%
Number of consecutive years interest may be deferred																																																																												ten	ten
Funds deposited with a trustee to defease bonds																																																								12,000,000	13,000,000
Proceeds from issuance of secured debt																																																										394,000,000	246,000,000	458,000,000
Portion of issuance proceeds used to repay short-term debt																																																										250,000,000
Aggregate carrying value of property subject to lien																																																													3,900,000,000	3,600,000,000								2,600,000,000	2,500,000,000			4,100,000,000	4,000,000,000
Principal amount that may be redeemed in whole or in part																																																															90,000,000
Earliest date the company may redeem the debt in whole or in part																																																															Oct. 31, 2020
Aggregate amount of tax-exempt revenue bonds in a term rate mode																																																																		321,000,000	183,000,000
Weighted-average interest rate of bonds in a term rate mode																																																																		3.57%	5.31%
Aggregate amount of tax-exempt revenue bonds remarketed and now in term mode																																																																		604,000,000	742,000,000					163,000,000
Weighted-average interest rate of bonds in a other rate mode																																																																		0.23%	0.45%
Maximum number of days wherein interest rates reset																																																																					weekly or every 35 days
Interest rate at end of period on remarketed debt																																																																				1.90%
Principal amount that may be redeemed in total but not in part																																																																																			354,000,000		350,000,000			225,000,000
Principal amount that may be put back to the issuer																																																																																			5,800,000,000		1,600,000,000		1,000,000,000	3,700,000,000										600,000,000				100,000,000		800,000,000
Interest rate at the end of the period																																																																																																				5.75%						6.00%			5.375%
Maximum interest rate under adjustment provisioins																																																																																																				6.50%						6.25%
Increase (decrease) due to changes in exchange rates																																																																																			16,000,000										4,000,000
Increase (decrease) due to changes in a specified index on principal amount																																																																																													22,000,000	14,000,000
Period, in years, bonds are in a term rate mode																																																							5
The amount of bonds held as investment by company																																																																									163,000,000
Common Stock Numeric [Abstract]
Stock issuance date	Apr. 30, 2011	Jun. 30, 2011
Shares of PPL common stock issued under a public equity offering	92,000,000	103,500,000
Price per share of PPL common stock issued under a public equity offering	$ 25.30	$ 24.00
Total gross increase in equity from issuance of PPL common stock issued under an equity offering	2,328,000,000	2,484,000,000
Net proceeds from issuance of PPL common stock issued under an equity offering	2,258,000,000	2,409,000,000
Underwriting discount related to equity offering	70,000,000	75,000,000
Equity Units [Line Items]
Equity unit issuance date								April 2011		June 2010
Number of equity units sold (in units)								19,550,000		23,000,000
Stated price per Equity Unit								50.00		50.00
Aggregate value of all Equity Units								978,000,000		1,150,000,000
Net proceeds from issuance of Equity Units								948,000,000		1,116,000,000
Underwriting discount related to issuance of equity units								30,000,000		34,000,000
Undivided beneficial ownership, in hundreths, in debt initially associated with Equity Units									5.00%		5.00%
Principal amount of PPL Capital Funding Junior Subordinated Notes that an Equity Unit holder has an interest									1,000		1,000
Dollar value of PPL common stock that the holder of Equity Unit is required to purchase									50.00		50.00
Number of trading days included in the calculation of average VWAP									20		20
Maximum average VWAP (in dollars per share)									$ 30.99		$ 28.80
The number of shares of PPL common stock to be issued under each purchase contract at maximum VWAP									1.6133		1.7361
Total shares of PPL common stock to be issued under Purchase Contract at maximum VWAP or higher									31,540,015		39,930,300
Range of average VWAP in middle tier of Purchase Contract settlement calculation									less than approximately $30.99 but greater than $25.30		less than $28.80 but greater than $24.00
Minimum average VWAP (in dollars per share)									$ 25.30		$ 24.00
Number of shares of PPL common stock to be issued to each Purchase Contract holder at minimum VWAP									1.9763		2.0833
Total shares of PPL common stock to be issued under Purchase Contract at minimum VWAP or lower									38,636,665		47,915,900
Maximum equity unit purchase contract component settlement date									May 1, 2014		July 1. 2013
Number of shares of PPL common stock to be issued to each holder if settled early									1.6133		1.7361
Rate on Purchase Contract component of Equity Units									4.43%		4.875%
Rate on Purchase Contract component of Equity Units on deferred contract adjustment payments									8.75%		9.50%
Number of tranches that will result from an expected remarketing									2		2
Minimum aggregate principal amount of each tranche when remarketing occurs									250,000,000		300,000,000
Minimum percentage of a tranche of the total when a remarketing occurs									50.00%		50.00%
Present value of the Purchase Contract component of the Equity Units			123,000,000		157,000,000			123,000,000		157,000,000
The term, in years, over which the accretion will occur									3			3
Equity Units underwriting discount and issuance costs allocated to equity									25,000,000			29,000,000
Equity Units underwriting discount and issuance costs allocated to debt									$ 6,000,000			$ 7,000,000

[1] At December 31, 2011: PPL - interest rates range from 2.125% to 6.85%, and maturities range from 2013 to 2047. PPL Energy Supply - interest rates range from 4.60% to 6.50%, and maturities range from 2013 to 2036. LKE - interest rates range from 2.125% to 4.375%, and maturities range from 2015 to 2021. At December 31, 2010: PPL - interest rates range from 2.125% to 7.00%, and maturities range from 2011 to 2047. PPL Energy Supply - interest rates range from 5.40% to 7.00%, and maturities range from 2011 to 2046. LKE - interest rates range from 2.125% to 3.75%, and maturities range from 2015 to 2020.

[2] Includes $99 million of notes that may be redeemed at par beginning in July 2012.

[3] Includes $300 million of 5.70% REset Put Securities due 2035 (REPSSM). The REPS bear interest at a rate of 5.70% per annum to, but excluding, October 15, 2015 (Remarketing Date). The REPS are required to be put by existing holders on the Remarketing Date either for (a) purchase and remarketing by a designated remarketing dealer or (b) repurchase by PPL Energy Supply. Therefore, the REPS are reflected as a 2015 maturity for PPL and PPL Energy Supply in (a) above. If the remarketing dealer elects to purchase the REPS for remarketing, it will purchase the REPS at 100% of the principal amount, and the REPS will bear interest on and after the Remarketing Date at a new fixed rate per annum determined in the remarketing. PPL Energy Supply has the right to terminate the remarketing process. If the remarketing is terminated at the option of PPL Energy Supply or under certain other circumstances, including the occurrence of an event of default by PPL Energy Supply under the related indenture or a failed remarketing for certain specified reasons, PPL Energy Supply will be required to pay the remarketing dealer a settlement amount as calculated in accordance with the related remarketing agreement. In July 2011, PPL Energy Supply redeemed at par the entire $250 million aggregate principal amount of its 7.00% Senior Notes due 2046. PPL Energy Supply recorded a loss of $7 million, which is reflected in "Interest Expense" on the Statements of Income for 2011, as a result of accelerating the amortization of deferred financing fees in connection with the redemption. In November 2011, PPL Energy Supply repaid the entire $500 million principal amount of its 6.40% Senior Notes upon maturity. In December 2011, PPL Energy Supply issued $500 million of 4.60% Senior Notes due 2021. The bonds may be redeemed at PPL Energy Supply's option at make-whole redemption prices until the date three months prior to maturity and at par thereafter. PPL Energy Supply received proceeds of $497 million, net of discounts and underwriting fees. The net proceeds were used to repay a portion of short-term debt incurred to repay at maturity PPL Energy Supply's $500 million aggregate principal amount of 6.40% Senior Notes due November 1, 2011. The balance of the net proceeds will be used for general corporate purposes.

[4] Includes $875 million of Senior Notes issued by LKE in 2010 in private offerings to qualified institutional buyers and other transactions not subject to registration requirements under the Securities Act of 1933. In April 2011, LKE filed 2011 Registration Statements with the SEC related to offers to exchange securities issued in November 2010 in transactions not registered under the Securities Act of 1933 with similar but registered securities. The 2011 Registration Statements became effective in June 2011 and the exchanges were completed in July 2011, with substantially all securities being exchanged. In September 2011, LKE issued $250 million of 4.375% Senior Notes due 2021. The notes were issued in a private offering to qualified institutional buyers and other transactions not subject to registration requirements under the Securities Act of 1933. In connection with the issuance, LKE entered into a registration rights agreement with representatives of the initial purchasers of the notes, pursuant to which LKE agreed to file, by late April 2012, a registration statement to exchange such notes for securities containing substantially identical terms (except for certain transfer restrictions), or in certain cases to file, by late April 2012, a registration statement covering resale of the notes. LKE also agreed, under its registration rights agreement, to (i) use its commercially reasonable efforts to cause the registration statement to be declared effective under the Securities Act by late July 2012 and (ii) upon effectiveness of the registration statement, take certain actions to promptly exchange the notes or, in the case of a registration statement covering resale of the notes, keep the registration statement effective until no later than late September 2012. Pursuant to the registration rights agreement, LKE may be required to pay liquidated damages if it does not meet certain requirements under its registration rights agreement. Liquidated damages will generally accrue with respect to the principal amount of the notes at a rate of 0.25% per annum for the first 90 days from and including the date on which a default specified under the registration rights agreement occurs, and increase by an additional 0.25% per annum thereafter, provided that the liquidated damages rate shall not at any time exceed 0.50% per annum. Liquidated damages will cease to accrue when all registration defaults under the registration rights agreement have been cured, or if earlier, upon the redemption by the issuer or maturity of the notes. The notes may be redeemed at LKE's option at make-whole redemption prices until the date three months prior to maturity and at par thereafter. LKE received proceeds of $248 million, net of discounts and underwriting fees. The net proceeds have been used to make a return of capital to PPL.

[5] 2011 includes $480 million of Junior Subordinated Notes that bear interest at 6.70% into March 2017, at which time the notes will bear interest at three-month LIBOR plus 2.665%, reset quarterly, until maturity. Interest payments may be deferred, from time to time, on one or more occasions for up to ten consecutive years. The notes may be redeemed at par beginning in March 2017. 2011 also includes $978 million of 4.32% Junior Subordinated Notes due 2019 that were issued in connection with PPL's issuance of the 2011 Equity Units in April 2011 and $1.15 billion of 4.625% Junior Subordinated Notes due 2018 that were issued in connection with PPL's issuance of the 2010 Equity Units in June 2010. See discussion of the Equity Units below for further information on such notes. 2010 includes $480 million of Junior Subordinated Notes that bear interest at 6.70% into March 2017, at which time the notes will bear interest at three-month LIBOR plus 2.665%, reset quarterly, until maturity. Interest payments may be deferred, from time to time, on one or more occasions for up to ten consecutive years. The notes may be redeemed at par beginning in March 2017. 2010 also includes $1.15 billion of 4.625% Junior Subordinated Notes due 2018 that were issued in connection with PPL's issuance of the 2010 Equity Units in June 2010.

[6] Represents lease financing consolidated through a VIE. See Note 22 for additional information.

[7] The 1945 First Mortgage Bonds were issued under, and secured by, the lien of the 1945 First Mortgage Bond Indenture. In December 2008, PPL Electric completed an in-substance defeasance of the 1945 First Mortgage Bonds by depositing sufficient funds with the trustee solely to satisfy the principal and remaining interest obligations on the bonds when due. The amount of funds on deposit with the trustee was $12 million at December 31, 2011 and $13 million at December 31, 2010, and is recorded as restricted cash, primarily in "Other noncurrent assets" on the Balance Sheets. Also in December 2008, PPL Electric discharged the lien under the 1945 First Mortgage Bond Indenture, which covered substantially all electric distribution plant and certain transmission plant owned by PPL Electric.

[8] At December 31, 2011: PPL - interest rates range from 1.625% to 6.45%, and maturities range from 2015 to 2041. PPL Electric - interest rates range from 3.00% to 6.45%, and maturities range from 2015 to 2041. LG&E - interest rates range from 1.625% to 5.125%, and maturities range from 2015 to 2040. KU - interest rates range from 1.625% to 5.125%, and maturities range from 2015 to 2040. At December 31, 2010: PPL - interest rates range from 1.625% to 7.125%, and maturities range from 2013 to 2040. PPL Electric - interest rates range from 4.95% to 7.125%, and maturities range from 2013 to 2039. LG&E - interest rates range from 1.625% to 5.125%, and maturities range from 2015 to 2040. KU - interest rates range from 1.625% to 5.125%, and maturities range from 2015 to 2040. In July 2011, PPL Electric issued $250 million of 5.20% First Mortgage Bonds due 2041. The bonds may be redeemed at PPL Electric's option at make-whole redemption prices until the date six months prior to maturity and at par thereafter. PPL Electric received proceeds of $246 million, net of discounts and underwriting fees. The net proceeds have been or will be used for capital expenditures and other general corporate purposes. Also in July 2011, PPL Electric redeemed the entire $400 million aggregate principal amount of its 7.125% Senior Secured Bonds due 2013 for $458 million, plus accrued interest. PPL Electric recorded a regulatory asset for the redemption premium and unamortized financing costs associated with this debt. See Note 6 for additional information. In August 2011, PPL Electric issued $400 million of 3.00% First Mortgage Bonds due 2021. The bonds may be redeemed at PPL Electric's option at make-whole redemption prices until the date three months prior to maturity and at par thereafter. PPL Electric received proceeds of $394 million, net of discounts and underwriting fees. The net proceeds were used to repay $250 million of short-term debt and to replenish cash used to redeem the 7.125% Senior Secured Bonds due 2013 in July 2011, as discussed above. The senior secured and first mortgage bonds issued by PPL Electric are secured by the lien of the PPL Electric 2001 Mortgage Indenture, which covers substantially all electric distribution plant and certain transmission plant owned by PPL Electric. The carrying value of PPL Electric's property, plant and equipment was approximately $3.9 billion and $3.6 billion at December 31, 2011 and 2010. LG&E's first mortgage bonds are secured by the lien of the LG&E 2010 Mortgage Indenture, which creates a lien, subject to certain exceptions and exclusions, on substantially all of LG&E's real and tangible personal property located in Kentucky and used or to be used in connection with the generation, transmission and distribution of electricity and the storage and distribution of natural gas. The aggregate carrying value of the property subject to the lien was $2.6 billion and $2.5 billion at December 31, 2011 and December 31, 2010. KU's first mortgage bonds are secured by the lien of the KU 2010 Mortgage Indenture, which creates a lien, subject to certain exceptions and exclusions, on substantially all of KU's real and tangible personal property located in Kentucky and used or to be used in connection with the generation, transmission and distribution of electricity. The aggregate carrying value of the property subject to the lien was $4.1 billion and $4.0 billion at December 31, 2011 and December 31, 2010. The LG&E and KU first mortgage bonds were issued in 2010 in private offerings to qualified institutional buyers and other transactions not subject to registration requirements under the Securities Act of 1933. In April 2011, LG&E and KU each filed 2011 Registration Statements with the SEC related to offers to exchange the first mortgage bonds with similar but registered securities. The 2011 Registration Statements became effective in June 2011 and the exchanges were completed in July 2011, with substantially all securities being exchanged.

[9] PPL Electric issued a series of its senior secured bonds to secure its obligations to make payments with respect to each series of Pollution Control Bonds that were issued by the LCIDA and the PEDFA on behalf of PPL Electric. These senior secured bonds were issued in the same principal amount, contain payment and redemption provisions that correspond to and bear the same interest rate as such Pollution Control Bonds. These senior secured bonds were issued under PPL Electric's 2001 Mortgage Indenture and are secured as noted in (i) above. $224 million of such bonds may be redeemed at par beginning in 2015. $90 million of such bonds may be redeemed, in whole or in part, at par beginning in October 2020 and are subject to mandatory redemption upon determination that the interest rate on the bonds would be included in the holders' gross income for federal tax purposes.

[10] In October 2010, LG&E and KU each issued a series of first mortgage bonds to the respective trustees of tax-exempt revenue bonds to secure its respective obligations to make payments with respect to each series of bonds. The first mortgage bonds were issued in the same principal amount, contain payment and redemption provisions that correspond to and bear the same interest rate as such tax-exempt revenue bonds. These first mortgage bonds were issued under the LG&E 2010 Mortgage Indenture and the KU 2010 Mortgage Indenture and are secured as noted in (i) above. The related tax-exempt revenue bonds were issued by various governmental entities, principally counties in Kentucky, on behalf of LG&E and KU. The related revenue bond documents allow LG&E and KU to convert the interest rate mode on the bonds from time to time to a commercial paper rate, daily rate, weekly rate, term rate of at least one year or, in some cases, an auction rate or a LIBOR index rate. At December 31, 2011, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a term rate mode totaled $321 million, $294 million and $27 million for LKE, LG&E and KU. The weighted average rates on these bonds were 3.57%, 3.37% and 5.83% for LKE, LG&E and KU. At December 31, 2010, the amounts that were in a term rate mode totaled $183 million, $156 million and $27 million for LKE, LG&E and KU. The weighted average rates on these bonds were 5.31%, 5.22% and 5.83% for LKE, LG&E and KU. At December 31, 2011, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a variable rate mode totaled $604 million, $280 million and $324 million for LKE, LG&E and KU. The weighted average rates on these bonds were 0.23%, 0.33% and 0.15% for LKE, LG&E and KU. At December 31, 2010, the amounts that were in a variable rate mode totaled $742 million, $418 million and $324 million for LKE, LG&E and KU. The weighted average rates on these bonds were 0.45%, 0.55% and 0.38% for LKE, LG&E and KU.

[11] The interest rate mode on all three series of bonds was converted from a commercial paper rate to a term rate of 3.00% for five years, effective in September 2010.

[12] At December 31, 2011: PPL and PPL Energy Supply - 6.00% notes due 2020. At December 31, 2010: PPL - 6.00%- 7.471% notes due 2011-2020. PPL Energy Supply - 6.00% notes due 2020. LKE - 7.471% notes due 2011.

[13] Includes £225 million ($354 million at December 31, 2011 and $350 million at December 31, 2010) of notes that may be redeemed, in total but not in part, on December 21, 2026, at the greater of the principal value or a value determined by reference to the gross redemption yield on a nominated U.K. Government bond.  Also includes £3.7 billion ($5.8 billion) at December 31, 2011 and £1.0 billion ($1.6 billion) at December 31, 2010 of notes that may be put by the holders back to the issuer for redemption if the long-term credit ratings assigned to the Notes by Moody's, S&P or Fitch are withdrawn by any of the rating agencies or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event. A restructuring event includes the loss of, or a material adverse change to, the distribution licenses under which WPD's network companies operate. In connection with the closing of the acquisition of WPD Midlands in April 2011, PPL assumed, through consolidation, £250 million of Senior Notes due 2040 (2040 Notes) previously issued by WPD (East Midlands), and £250 million of Senior Notes due 2025 (2025 Notes) previously issued by WPD (West Midlands), equating to an aggregate principal amount of approximately $800 million at the time of closing. The interest rates on the notes are subject to adjustment into June 2012 in the event of a rating change on the notes. The 2040 Notes currently bear interest at 5.75% and the 2025 Notes currently bear interest at 6.00%. The maximum rate of interest allowable under the adjustment provisions is 6.50% for the 2040 Notes and 6.25% for the 2025 Notes. The 2025 Notes and 2040 Notes may be put by the holders back to the respective issuer for redemption if the long-term credit ratings assigned to the notes by Moody's or S&P are withdrawn by either of the rating agencies or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event. A restructuring event includes the loss of, or material adverse change to, the distribution license under which WPD (West Midlands) and WPD (East Midlands) operate. In April 2011, PPL WEM issued $460 million of 3.90% Senior Notes due 2016 (2016 Notes) and $500 million of 5.375% Senior Notes due 2021 (2021 Notes). The 2016 Notes may be redeemed any time prior to maturity at PPL WEM's option at make-whole redemption prices. The 2021 Notes may be redeemed at PPL WEM's option at make-whole redemption prices until the date three months prior to maturity and at par thereafter. PPL WEM received proceeds of $953 million, net of discounts and underwriting fees, from the combined issuance of the notes. The net proceeds were used to repay a portion of PPL WEM's borrowing under the 2011 Bridge Facility as discussed above. In connection with the issuance of the senior notes, PPL WEM, through PPL, entered into cross currency interest rate swaps for the entire aggregate principal amount of each series of notes in order to hedge PPL WEM's risk of variability in the GBP functional currency equivalent cash flows related to its U.S. dollar interest and principal payments on the notes. In May 2011, WPD (West Midlands) issued £800 million of 5.75% Senior Notes due 2032 (2032 Notes) and WPD (East Midlands) issued £600 million of 5.25% Senior Notes due 2023 (2023 Notes). WPD (West Midlands) and WPD (East Midlands) collectively received proceeds of £1.4 billion, which equated to $2.2 billion at the time of issuance, net of discounts and underwriting fees, from the combined debt issuances. A portion of the net proceeds were dividended to PPL WEM and used to repay the remaining balance of PPL WEM's borrowing under the 2011 Bridge Facility in May 2011 as discussed above. The balance of the net proceeds have been or will be used to pre-fund certain capital expenditures and for other general corporate purposes. The 2032 Notes and the 2023 Notes may be put by the holders back to the respective issuer for redemption if the long-term credit ratings assigned to the notes by Moody's or S&P are withdrawn by either of the rating agencies or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event. A restructuring event includes the loss of, or material adverse change to, the distribution license under which WPD (West Midlands) and WPD (East Midlands) operate. The change from 2010 to 2011 includes an increase of $16 million resulting from movements in foreign currency exchange rates related to the amounts that were outstanding at both December 31, 2010 and December 31, 2011.

[14] The principal amount of the notes issued by WPD (South West) is adjusted on a semi-annual basis based on changes in a specified index, as detailed in the terms of the related indentures. The adjustment to the principal amount from 2010 to 2011 was an increase of approximately £14 million ($22 million) resulting from inflation and a $4 million increase resulting from movements in foreign currency exchange rates. These notes may be redeemed, in total by series, on December 1, 2026, at the greater of the adjusted principal value and a make-whole value determined by reference to the gross real yield on a nominated U.K. government bond. Additionally, these notes may be put by the holders back to the issuer for redemption if the long-term credit ratings assigned to the notes by Moody's, S&P or Fitch are withdrawn by any of the rating agencies or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event. A restructuring event includes the loss of, or a material adverse change to, the distribution license under which the issuer operates. In June 2011, WPD (East Midlands) issued £100 million of Index-Linked Notes due 2043 (2043 Notes). The principal amount of the 2043 Notes is adjusted based on changes in a specified index, as detailed in the terms of the notes. WPD (East Midlands) received proceeds of £99 million, which equated to $163 million at the time of issuance, net of discounts and underwriting fees, from the issuance of the 2043 Notes. The majority of the net proceeds were used to repay short-term debt. Since issuance, the principal amount on the 2043 Notes has increased by approximately £2 million ($4 million) as a result of inflation. The 2043 Notes may be put by the holders back to WPD (East Midlands) for redemption if the long-term credit ratings assigned to the notes by Moody's or S&P are withdrawn by either of the rating agencies or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event. A restructuring event includes the loss of, or material adverse change to, the distribution license under which WPD (East Midlands) operates.

[15] Reflects adjustments made to record WPD's long-term debt at fair value at the time of acquisition of the controlling interest in WPD in 2002 and the acquisition of WPD Midlands in 2011.

[16] Reflects adjustments made to record LG&E's and KU's long-term debt at fair value at the time of acquisition of LKE in 2010.

[17] Aggregate maturities of long-term debt are: PPL - 2012, $0; 2013, $737; 2014, $310; 2015, $1,300; 2016, $810; and $14,825 thereafter. PPL Energy Supply - 2012, $0; 2013, $737; 2014, $300; 2015, $300; 2016, $350; and $1,336 thereafter. PPL Electric - 2012, $0; 2013, $0; 2014, $10; 2015, $100; 2016, $0; and $1,614 thereafter. LKE - 2012, $0; 2013, $0; 2014, $0; 2015, $900; 2016, $0; and $3,185 thereafter. LG&E - 2012, $0; 2013, $0; 2014, $0; 2015, $250; 2016, $0; and $859 thereafter. KU - 2012, $0; 2013, $0; 2014, $0; 2015, $250; 2016, $0; and $1,601 thereafter. None of the debt securities outstanding have sinking fund requirements.