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Financing Activities (Long-term Debt and Equity Securities) (Details)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 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 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jul. 31, 2013
USD ($)
Apr. 30, 2012
Integer
Apr. 30, 2011
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Apr. 30, 2011
Equity Units 2011 [Member]
USD ($)
EquityUnits
Dec. 31, 2013
Equity Units 2011 [Member]
USD ($)
Integer
May 31, 2013
Forward Sale Agreement [Member]
USD ($)
Apr. 30, 2013
Forward Sale Agreement [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
Jul. 31, 2013
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
USD ($)
Jul. 31, 2013
PPL Electric [Member]
First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
LKE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Nov. 30, 2013
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Nov. 30, 2013
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Oct. 31, 2013
WPD East Midlands [Member]
Index Linked Senior Unsecured Notes [Member]
USD ($)
Sep. 30, 2013
WPD East Midlands [Member]
Index Linked Senior Unsecured Notes [Member]
USD ($)
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]
GBP (£)
Oct. 31, 2013
WPD West Midlands [Member]
Senior Unsecured Notes [Member]
USD ($)
Oct. 31, 2013
WPD West Midlands [Member]
Senior Unsecured Notes [Member]
GBP (£)
May 31, 2013
PPL Capital Funding [Member]
Senior Unsecured Notes [Member]
USD ($)
May 31, 2013
PPL Capital Funding [Member]
Senior Unsecured Notes [Member]
USD ($)
May 31, 2013
PPL Capital Funding [Member]
Senior Unsecured Notes [Member]
USD ($)
May 31, 2013
PPL Capital Funding [Member]
Junior Subordinated Notes [Member]
USD ($)
Integer
Mar. 31, 2013
PPL Capital Funding [Member]
Junior Subordinated Notes [Member]
USD ($)
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]
Junior Subordinated Notes [Member]
USD ($)
Dec. 31, 2013
US [Member]
USD ($)
Dec. 31, 2012
US [Member]
USD ($)
Dec. 31, 2013
US [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
US [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
US [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2012
US [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
US [Member]
Junior Subordinated Notes [Member]
USD ($)
Dec. 31, 2012
US [Member]
Junior Subordinated Notes [Member]
USD ($)
Dec. 31, 2013
US [Member]
Other [Member]
USD ($)
Dec. 31, 2012
US [Member]
Other [Member]
USD ($)
Feb. 28, 2013
US [Member]
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
US [Member]
PPL Energy Supply [Member]
Senior Unsecured Notes [Member]
REset Put Securities [Member]
USD ($)
Feb. 28, 2013
US [Member]
PPL Energy Supply [Member]
Senior Secured Notes [Member]
Dec. 31, 2013
US [Member]
PPL Electric [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2001 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
US [Member]
PPL Electric [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2001 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
US [Member]
PPL Electric [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Pollution Control Revenue Refunding Bonds [Member]
USD ($)
Dec. 31, 2013
US [Member]
LKE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
US [Member]
LKE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Insured Auction Rate Securities [Member]
USD ($)
Dec. 31, 2013
US [Member]
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
US [Member]
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
US [Member]
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
US [Member]
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
US [Member]
PPL Capital Funding [Member]
Junior Subordinated Notes [Member]
Feb. 28, 2013
US [Member]
PPL Ironwood [Member]
Senior Secured Notes [Member]
USD ($)
Dec. 31, 2013
UK [Member]
USD ($)
Dec. 31, 2013
UK [Member]
GBP (£)
Dec. 31, 2012
UK [Member]
USD ($)
Dec. 31, 2013
UK [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
UK [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
UK [Member]
Index Linked Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
UK [Member]
Index Linked Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
UK [Member]
WPD South West And WPD East Midlands [Member]
Index Linked Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
UK [Member]
WPD South West And WPD East Midlands [Member]
Index Linked Senior Unsecured Notes [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD South West [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
UK [Member]
WPD South West [Member]
Senior Unsecured Notes [Member]
GBP (£)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Jul. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
REset Put Securities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Senior Secured Notes [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Senior Secured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Other [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Other [Member]
USD ($)
Feb. 28, 2013
PPL Energy Supply LLC [Member]
US [Member]
Senior Unsecured Notes [Member]
USD ($)
Feb. 28, 2013
PPL Energy Supply LLC [Member]
US [Member]
Senior Secured Notes [Member]
Feb. 28, 2013
PPL Energy Supply LLC [Member]
US [Member]
PPL Ironwood [Member]
Senior Secured Notes [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2001 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2001 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Pollution Control Revenue Refunding Bonds [Member]
USD ($)
Jul. 31, 2013
PPL Electric Utilities Corp [Member]
First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Other [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Other [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Insured Auction Rate Securities [Member]
USD ($)
Nov. 30, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Nov. 30, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
US [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
USD ($)
Nov. 30, 2013
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Insured Auction Rate Securities [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
US [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
Nov. 30, 2013
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
2010 Mortgage Indenture [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Insured Auction Rate Securities [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
US [Member]
Senior Secured Notes - First Mortgage Bonds [Member]
Tax Exempt Revenue Bonds [Member]
USD ($)
Debt Instrument [Line Items]                                                                                                                                                                                                                                                                
Weighted-Average Rate                                                                     4.31%   3.80%   5.29%   6.95%                                     5.53%   1.83%               5.32%   5.32%         8.86%   6.00%             4.63%           7.38%       3.31%   3.18%                           2.77%                   3.44%            
Maturity date of long-term debt range start                                                                     Aug. 15, 2014   Nov. 01, 2015   May 01, 2019   Mar. 01, 2014                                     May 01, 2016   Jun. 01, 2043                   Aug. 15, 2014                           Dec. 15, 2015                   Nov. 15, 2015   Nov. 01, 2015                           Nov. 15, 2015                   Nov. 01, 2015            
Maturity date of long-term date range end                                                                     Jun. 01, 2043   Nov. 15, 2043   Apr. 30, 2073   Nov. 30, 2020                                     Dec. 10, 2040   Dec. 01, 2056                   Dec. 01, 2038                           Jul. 15, 2043                   Oct. 01, 2021   Nov. 15, 2043                           Nov. 15, 2043                   Nov. 15, 2043            
Principal outstanding       $ 20,935,000,000 $ 19,435,000,000                                                       $ 13,314,000,000 $ 12,716,000,000 $ 5,568,000,000 [1] $ 4,506,000,000 [1] $ 5,823,000,000 [2],[3],[4],[5] $ 5,587,000,000 [2],[3],[4],[5] $ 1,908,000,000 $ 2,608,000,000 $ 15,000,000 $ 15,000,000   $ 300,000,000                         $ 7,621,000,000 [6]   $ 6,719,000,000 [6] $ 6,872,000,000 [7] $ 6,111,000,000 [7] $ 749,000,000 [8] $ 608,000,000 [8]         $ 2,547,000,000 $ 3,249,000,000 $ 2,493,000,000 [1]   $ 2,493,000,000 [1] $ 2,581,000,000 [1] $ 300,000,000     $ 49,000,000 [5] $ 663,000,000 [5] $ 5,000,000 $ 5,000,000       $ 2,324,000,000 $ 1,974,000,000 $ 2,314,000,000 [2],[4] $ 1,964,000,000 [2],[4]         $ 10,000,000 $ 10,000,000 $ 4,585,000,000 $ 4,085,000,000 $ 1,125,000,000 $ 1,125,000,000 $ 3,460,000,000 [2],[3] $ 2,960,000,000 [2],[3]                   $ 1,359,000,000 $ 1,109,000,000   $ 1,359,000,000 [2],[3] $ 1,109,000,000 [2],[3]           $ 2,101,000,000 $ 1,851,000,000   $ 2,101,000,000 [2],[3] $ 1,851,000,000 [2],[3]          
Maturity date (in years)                     Dec. 21, 2013 Jul. 15, 2013     Jul. 15, 2043   Nov. 15, 2043 Nov. 15, 2043 Sep. 24, 2052 Sep. 24, 2052     Oct. 17, 2024 Oct. 17, 2024 Jun. 01, 2018 Jun. 01, 2023 Jun. 01, 2043   Apr. 30, 2073 Jul. 01, 2018 Jun. 01, 2016 Jun. 01, 2018                     Dec. 15, 2021 Dec. 31, 2035 Nov. 30, 2025                   May 01, 2019                             Dec. 21, 2013 Jul. 15, 2013     Dec. 31, 2035     Nov. 30, 2025   Nov. 30, 2020   Dec. 15, 2021 Nov. 30, 2025                 Jul. 15, 2043 Mar. 01, 2014                   Nov. 15, 2043     Nov. 15, 2043           Nov. 15, 2043                   Nov. 15, 2043              
Fair market value adjustments       23,000,000 78,000,000                                                                                                                             (22,000,000) 22,000,000                                                 (1,000,000) 7,000,000                           (1,000,000) 6,000,000                 1,000,000 1,000,000                
Unamortized premium and (discount), net       (51,000,000) (37,000,000)                                                                                                                                                                                                                                                      
Unamortized discount                                                                                                                                         1,000,000                             (9,000,000) (7,000,000)                 (19,000,000) (17,000,000)                           (5,000,000) (3,000,000)                 (11,000,000) (10,000,000)                
Total Long-term Debt       20,907,000,000 19,476,000,000                                                                                                                             2,525,000,000 3,272,000,000                             2,315,000,000                                                                                        
Less current portion of Long-term debt       315,000,000 751,000,000                                                                                                                             304,000,000 751,000,000                             10,000,000                                                                                         
Long-term Debt       20,592,000,000 18,725,000,000                                                                                                                             2,221,000,000 2,521,000,000                             2,305,000,000 1,967,000,000                 4,565,000,000 4,075,000,000                           1,353,000,000 1,112,000,000                 2,091,000,000 1,842,000,000                
Aggregate maturities of long-term debt (Details) [Abstract]                                                                                                                                                                                                                                                                
2014       314,000,000                                                                                                                               304,000,000                               10,000,000                                                                                           
2015       1,304,000,000                                                                                                                               304,000,000                               100,000,000                   900,000,000                             250,000,000                   250,000,000                  
2016       814,000,000                                                                                                                               354,000,000                                                                                                                            
2017       104,000,000                                                                                                                               4,000,000                                                                                                                            
2018       653,000,000                                                                                                                               403,000,000                                                                                                                            
Thereafter       17,746,000,000                                                                                                                               1,178,000,000                               2,214,000,000                   3,685,000,000                             1,109,000,000                   1,851,000,000                  
Long-term Debt (Numeric) [Abstract]                                                                                                                                                                                                                                                                
Principal amount                             350,000,000 348,000,000 250,000,000 250,000,000     25,000,000 40,000,000   400,000,000 250,000,000 600,000,000 300,000,000   450,000,000 1,150,000,000 300,000,000 850,000,000                     212,000,000             231,000,000                                                             212,000,000                   350,000,000                 348,000,000 231,000,000 250,000,000     250,000,000           250,000,000         120,000,000 135,000,000       250,000,000         228,000,000 96,000,000  
Stated interest rate                       6.30% 8.05% 8.30% 4.75%   4.65% 4.65%     1.676% 1.676% 3.875% 3.875% 1.90% 3.40% 4.70%   5.90% 4.625% 2.04% 2.77%                     4.60% 5.70%                     4.32% 8.857%                             6.30%     5.70% 8.05% 8.30%         4.60%   8.857%               4.75%                     4.65%     4.65%           4.65%                   4.65%              
Percentage of principal amount the remarketing dealer will pay if the REPS are purchased for remarketing                                                                                       100.00%                                                           100.00%                                                                                                            
Aggregate carrying value of property subject to lien                                                                                           5,100,000,000 4,300,000,000       3,200,000,000 2,700,000,000 5,100,000,000 4,400,000,000                                                                   5,100,000,000 4,300,000,000                           3,200,000,000 2,700,000,000   5,100,000,000 4,400,000,000             3,200,000,000 2,700,000,000                 5,100,000,000 4,400,000,000      
Principal amount that may be redeemed at a future date                                                                                               224,000,000                                                                                   224,000,000                                                                            
Earliest date the company may redeem the debt                                                                                               Feb. 15, 2015                                                                                   Feb. 15, 2015                                                                            
Principal amount that may be redeemed in whole or in part                                                                                               90,000,000                                                                                   90,000,000                                                                            
Earliest date the company may redeem the debt in whole or in part                                                                                               Oct. 01, 2020                                                                                   Oct. 01, 2020                                                                            
Aggregate amount of tax-exempt revenue bonds in a term rate mode                                                                                                 321,000,000                                                                                                     321,000,000                               294,000,000                   27,000,000    
Aggregate amount of tax-exempt revenue bonds in a variable rate mode                                                                                                 604,000,000                                                                                                                     604,000,000                   280,000,000                   324,000,000
Maximum number of days wherein interest rates reset                                                                                                   weekly or every 35 days                                                                                                     weekly or every 35 days                               weekly or every 35 days                   weekly or every 35 days  
Principal amount that may be redeemed in total but not in part                                                                                                                                   368,000,000 225,000,000                                                                                                                          
Increase (decrease) in principal due to inflation                                                                                                                               20,000,000 12,000,000                                                                                                                              
Principal amount that may be put back to the issuer                                                                                                                 6,200,000,000 3,800,000,000                                                                                                                                            
Net proceeds from issuance of unsecured debt                                     40,000,000 64,000,000     637,000,000 394,000,000         436,000,000                                                                                                                                                                                                      
Proceeds from issuance of secured debt                             345,000,000   246,000,000 246,000,000                                                                                                                                                 345,000,000                     246,000,000     246,000,000           246,000,000                   246,000,000              
Principal amount of debt exchanged                                                                                                               167,000,000                                                     167,000,000                                                                                          
Number of tranches of debt entered into relating to the debt extinguishment                                                       3                                                                                                                                                                                                        
Interest payments relating to debt extinguishment costs                                                       10,000,000                                                                                                                                                                                                        
Repayments of senior notes                       300,000,000 284,000,000 153,000,000                                                                                                                 300,000,000       284,000,000 153,000,000                                                                                                        
Equity Securities (Numeric) [Abstract]                                                                                                                                                                                                                                                                
Number of shares of common stock repurchased       2,400,000                                                                                                                                                                                                                                                        
Repurchase of common stock due to the repurchase program       74,000,000                                                                                                                                                                                                                                                          
Stock issuance date       Apr. 30, 2012                                                                                                                                                                                                                                                        
Shares of PPL common stock issued 40,000,000 9,900,000 92,000,000                                                                                                                                                                                                                                                          
Additional shares of common stock to be purchased by underwriters in a future period to cover over-allotments   591,000                                                                                                                                                                                                                                                            
Settlement date of forward sale agreements   Apr. 30, 2013                                                                                                                                                                                                                                                            
Price per share of PPL common stock issued $ 28.73   $ 25.30                                                                                                                                                                                                                                                          
Total gross increase in equity from issuance of PPL common stock     2,328,000,000                                                                                                                                                                                                                                                          
Underwriting discount related to equity offering     70,000,000                                                                                                                                                                                                                                                          
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                                                                                                                                                                                                                                                            
Settlement date of subsequent forward sale agreements                 May 31, 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       (13,000,000) [9]         4,000,000                                                                                                                                                                                                                                              
Net cash received on stock transaction 1,150,000,000   2,258,000,000             205,000,000                                                                                                                                                                                                                                            
Equity Units [Line Items]                                                                                                                                                                                                                                                                
Equity unit issuance date             2011-04-01                                                                                                                                                                                                                                                  
Number of equity units sold (in units)             19,550,000                                                                                                                                                                                                                                                  
Stated price per Equity Unit             50.00                                                                                                                                                                                                                                                  
Aggregate value of Equity Units expected to be remarketed             978,000,000                                                                                                                                                                                                                                                  
Net proceeds from issuance of Equity Units             948,000,000                                                                                                                                                                                                                                                  
Underwriting discount related to issuance of equity units             30,000,000                                                                                                                                                                                                                                                  
Undivided beneficial ownership in debt initially associated with Equity Units               5.00%                                                                                                                                                                                                                                                
Principal amount of PPL Capital Funding Junior Subordinated Notes that an Equity Unit holder has an interest               1,000                                                                                                                                                                                                                                                
Dollar value of PPL common stock that the holder of Equity Unit is required to purchase               50.00                                                                                                                                                                                                                                                
Number of trading days included in the calculation of average VWAP               20                                                                                                                                                                                                                                                
Maximum average VWAP (in dollars per share)               $ 30.99                                                                                                                                                                                                                                                
The number of shares of PPL common stock to be issued under each purchase contract at maximum VWAP               1.6133                                                                                                                                                                                                                                                
Total shares of PPL common stock to be issued under Purchase Contract at maximum VWAP or higher               31,540,015                                                                                                                                                                                                                                                
Range of average VWAP in middle tier of Purchase Contract settlement calculation               less than approximately $30.99 but greater than $25.30                                                                                                                                                                                                                                                
Minimum average VWAP (in dollars per share)               $ 25.30                                                                                                                                                                                                                                                
Number of shares of PPL common stock to be issued to each Purchase Contract holder at minimum VWAP               1.9763                                                                                                                                                                                                                                                
Total shares of PPL common stock to be issued under Purchase Contract at minimum VWAP or lower               38,636,665                                                                                                                                                                                                                                                
Maximum equity unit purchase contract component settlement date               2014-05-01                                                                                                                                                                                                                                                
Number of shares of PPL common stock to be issued to each holder if settled early               1.6133                                                                                                                                                                                                                                                
Maximum number of shares of PPL common stock to be issued to settle the make whole provisions of the Purchase Contract component of the Equity Units               1,200,000                                                                                                                                                                                                                                                
Rate on Purchase Contract component of Equity Units               4.43%                                                                                                                                                                                                                                                
Rate on Purchase Contract component of Equity Units on deferred contract adjustment payments               8.75%                                                                                                                                                                                                                                                
Number of tranches that will result from an expected remarketing               2                                                                                                                                                                                                                                                
Minimum aggregate principal amount of each tranche when remarketing occurs               250,000,000                                                                                                                                                                                                                                                
Minimum percentage of a tranche of the total when a remarketing occurs               50.00%                                                                                                                                                                                                                                                
Number of tranches that will mature on or about third anniversary of the remarketing               1                                                                                                                                                                                                                                                
Present value of the Purchase Contract component of the Equity Units           $ 123,000,000                                                                                                                                                                                                                                                    
The term, in years, over which the accretion will occur               3                                                                                                                                                                                                                                                
[1] Includes $300 million of 5.70% REset Put Securities due 2035 (REPS). 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. 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.
[2] Includes PPL Electric's senior secured and first mortgage bonds that are secured by the lien of PPL Electric's 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 $5.1 billion and $4.3 billion at December 31, 2013 and 2012. Includes LG&E's first mortgage bonds that 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 $3.2 billion and $2.7 billion at December 31, 2013 and December 31, 2012. Includes KU's first mortgage bonds that 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 $5.1 billion and $4.4 billion at December 31, 2013 and December 31, 2012.
[3] Includes LG&E's and KU's series of first mortgage bonds that were issued 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 (c) 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, 2013, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a term rate mode totaled $321 million for LKE, comprised of $294 million and $27 million for LG&E and KU. At December 31, 2013, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a variable rate mode totaled $604 million for LKE, comprised of $280 million and $324 million for LG&E and KU. Several series of the tax-exempt revenue bonds are insured by monoline bond insurers whose ratings were reduced due to exposures relating to insurance of sub-prime mortgages. Of the bonds outstanding, $231 million are in the form of insured auction rate securities ($135 million for LG&E and $96 million for KU), wherein interest rates are reset either weekly or every 35 days via an auction process. Beginning in late 2007, the interest rates on these insured bonds began to increase due to investor concerns about the creditworthiness of the bond insurers. During 2008, interest rates increased, and LG&E and KU experienced failed auctions when there were insufficient bids for the bonds. When a failed auction occurs, the interest rate is set pursuant to a formula stipulated in the indenture. As noted above, the instruments governing these auction rate bonds permit LG&E and KU to convert the bonds to other interest rate modes. Certain variable rate tax-exempt revenue bonds totaling $348 million at December 31, 2013 ($120 million for LG&E and $228 million for KU), are subject to tender for purchase by LG&E and KU at the option of the holder and to mandatory tender for purchase by LG&E and KU upon the occurrence of certain events.
[4] Includes PPL Electric's series of senior secured bonds that 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 (c) above. This amount includes $224 million that may be redeemed at par beginning in 2015 and $90 million that 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.
[5] 2012 includes lease financing consolidated through a VIE which was repaid in 2013. See Note 22 for additional information.
[6] Includes £3.8 billion ($6.2 billion at December 31, 2013) of notes that may be put by the holders to the issuer for redemption if the long-term credit ratings assigned to the notes are withdrawn by any of the rating agencies (Moody's, S&P or Fitch) or reduced to a non-investment grade rating of Ba1 or BB+ in connection with a restructuring event which includes the loss of, or a material adverse change to, the distribution licenses under which the issuer operates.
[7] Includes £225 million ($368 million at December 31, 2013) 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.
[8] The principal amount of the notes issued by WPD (South West) and WPD (East Midlands) is adjusted based on changes in a specified index, as detailed in the terms of the related indentures. The adjustment to the principal amounts from 2012 to 2013 was an increase of approximately £12 million ($20 million) resulting from inflation. In addition, this amount includes £225 million ($368 million at December 31, 2013) of notes issued by WPD (South West) that 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.
[9] See Note 7 for additional information.