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Financing Activities (LT Debt and Equity Securities) (Details)
1 Months Ended3 Months Ended9 Months Ended1 Months Ended9 Months Ended1 Months Ended0 Months Ended1 Months Ended9 Months Ended1 Months Ended9 Months Ended1 Months Ended9 Months Ended
Apr. 30, 2011
USD ($)
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Jul. 31, 2011
US [Member]
Senior Unsecured Notes [Member]
PPL Energy Supply 2046 Senior Notes [Member]
USD ($)
Sep. 30, 2011
US [Member]
Senior Unsecured Notes [Member]
LKE 2021 Senior Notes [Member]
USD ($)
Apr. 30, 2011
US [Member]
Junior Subordinated Notes [Member]
PPL Capital Funding 2019 Junior Subordinated Notes [Member]
USD ($)
Sep. 30, 2011
US [Member]
Junior Subordinated Notes [Member]
PPL Capital Funding 2019 Junior Subordinated Notes [Member]
USD ($)
Jul. 31, 2011
US [Member]
First Mortgage Bonds [Member]
PPL Electric 2041 First Mortgage Bonds [Member]
USD ($)
Aug. 31, 2011
US [Member]
First Mortgage Bonds [Member]
PPL Electric 2021 First Mortgage Bonds [Member]
USD ($)
Jul. 31, 2011
US [Member]
Senior Secured - First Mortgage Bonds [Member]
PPL Electric 2013 Senior Secured Bonds [Member]
USD ($)
Jan. 31, 2011
US [Member]
Variable Rate Exempt Facilities Notes [Member]
Certain LGE Variable Rate Tax Exempt Revenue Bonds [Member]
USD ($)
Nov. 04, 2011
US [Member]
Subsequent To Period End Activity [Member]
PPL Energy Supply 2011 Senior Notes [Member]
USD ($)
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (East Midlands) Assumed Senior Notes [Member]
GBP (£)
Sep. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (East Midlands) Assumed Senior Notes [Member]
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (West Midlands) Assumed Senior Notes [Member]
GBP (£)
Sep. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (West Midlands) Assumed Senior Notes [Member]
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (East And West Midlands) Combined Assumed Senior Notes [Member]
USD ($)
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
PPL WEM 2016 Senior Notes [Member]
USD ($)
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
PPL WEM 2021 Senior Notes [Member]
USD ($)
Apr. 30, 2011
UK [Member]
Senior Unsecured Notes [Member]
PPL WEM Combined Senior Notes [Member]
USD ($)
May 31, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (West Midlands) 2032 Senior Unsecured Notes [Member]
GBP (£)
May 31, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (East Midlands) 2023 Senior Unsecured Notes [Member]
GBP (£)
May 31, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (West Midlands) And WPD (East Midlands) Combined Senior Unsecured Notes [Member]
USD ($)
May 31, 2011
UK [Member]
Senior Unsecured Notes [Member]
WPD (West Midlands) And WPD (East Midlands) Combined Senior Unsecured Notes [Member]
GBP (£)
Jun. 30, 2011
UK [Member]
Index-Linked Senior Unsecured Note [Member]
WPD (East Midlands) 2043 Index Linked Notes [Member]
USD ($)
Jun. 30, 2011
UK [Member]
Index-Linked Senior Unsecured Note [Member]
WPD (East Midlands) 2043 Index Linked Notes [Member]
GBP (£)
Apr. 30, 2011
Equity Units 2011 [Member]
USD ($)
EquityUnits
Sep. 30, 2011
Equity Units 2011 [Member]
USD ($)
Long-term Debt (Numeric) [Abstract]                              
Principal amount      $ 250,000,000  $ 250,000,000$ 400,000,000 $ 163,000,000 £ 250,000,000 £ 250,000,000 $ 800,000,000$ 460,000,000$ 500,000,000 £ 800,000,000£ 600,000,000   £ 100,000,000  
Stated interest rate (in hundreths)     7.00%4.375% 4.32%5.20%3.00%7.125% 6.40%     3.90%5.375% 5.75%5.25%      
Maturity date (in year)     20462021 2019204120212013  2040 2025  20162021 20322023  20432043  
Net proceeds from issuance of unsecured debt      248,000,000   394,000,000          953,000,000  2,200,000,0001,400,000,000163,000,00099,000,000  
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                     
Number of times and periods over which interest may be deferred        one or more times                     
Proceeds from Equity Units allocated to long-term debt based on fair value       978,000,000                      
Payment for the repurchase of notes           458,000,000                  
Earliest date the company may redeem the debtMay 01, 2016
Interest rate at the end of the period (in hundredths)               5.75% 6.00%            
Interest rate at end of period on remarketed debt (in hundredths)            1.90%                 
Issuance date         July 2011August 2011        April 2011April 2011 May 2011May 2011  June 2011June 2011  
Proceeds from issuance of secured debt         246,000,000                    
Maximum interest rate, in hundreths, under adjustment provisioins               6.50% 6.25%            
Portion of issuance proceeds used to repay short-term debt          250,000,000 163,000,000                 
Write-off of issuance costs     7,000,000                        
Liquidated damages initial interest rate (in hundredths)      0.25%                       
Period, in days, incuding the date of default whereby liquidated damages will accrue      90                       
Liquidated damages additional interest rate (in hundredths)      0.25%                       
Liquidated damages maximum interest rate (in hundredths)      0.50%                       
Period prior to maturity that debt can be redeemed at make-whole redemption prices (in months)      3  63                   
Debt repayments, par amount, during period     250,000,000     400,000,000 500,000,000                
Equity Securities (Numeric) [Abstract]                              
Stock issuance date   April 2011                          
Shares of PPL common stock issued under a public equity offering (in shares)92,000,00092,000,000103,500,00092,000,000103,500,000                         
Price per share of PPL common stock issued under a public equity offering$ 25.30                             
Total gross increase in equity from issuance of PPL common stock issued under an equity offering2,328,000,000                             
Net proceeds from issuance of PPL common stock issued under an equity offering2,258,000,000                             
Underwriting discount related to equity offering70,000,000                             
Equity Units (Numeric) [Abstract]                              
Equity unit issuance date                             April 2011
Number of equity units sold (in units)                            19,550,000 
Stated price per Equity Unit                            50.00 
Aggregate value of all Equity Units                            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 hundreths, 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   86,552,565                         38,636,665
Number of shares of PPL common stock to be issued to each holder if settled early                             1.6133
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%
Present value of the Purchase Contract component of the Equity Units   123,000,000157,000,000                         
The term, in years, over which the accretion will occur                             3
Equity Units underwriting discount and issuance costs allocated to equity                             25,000,000
Equity Units underwriting discount and issuance costs allocated to debt                             $ 6,000,000
Maximum equity unit purchase contract component settlement date                             May 1, 2014