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Financing Activities - Long-term Debt and ATM Program (Details)
$ / shares in Units, shares in Thousands, £ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Aug. 31, 2016
May 31, 2016
USD ($)
May 31, 2016
GBP (£)
Mar. 31, 2016
USD ($)
Feb. 26, 2015
USD ($)
Integer
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
May 31, 2016
GBP (£)
At-the-Market Stock Offering Program (Numeric) [Abstract]                        
Net proceeds from issuance of common stock                   $ 133 $ 145  
PPL Capital Funding [Member] | Senior Notes [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount       $ 650                
Stated interest rate       3.10%               3.10%
Proceeds from debt, net of issuance costs       $ 645                
Maturity date       May 15, 2026 May 15, 2026              
WPD East Midlands [Member] | Index Linked Term Loan [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate       0.4975%               0.4975%
Debt instrument term (in years)       10 years 10 years              
WPD PLC [Member] | Senior Notes [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate       3.90%               3.90%
Repayments of senior debt       $ 460                
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           $ 116            
Maturity date           Mar. 09, 2029            
Interest rate at an initial term rate           0.90%            
Repurchase date of debt instruments           Sep. 01, 2017            
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           $ 108            
Maturity date           Mar. 09, 2027            
Interest rate at an initial term rate           0.90%            
Repurchase date of debt instruments           Aug. 15, 2017            
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate           4.70%            
Maturity date           Mar. 09, 2029            
Repurchased face amount           $ 116            
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series B [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate           4.75%            
Maturity date           Mar. 09, 2027            
Repurchased face amount           $ 108            
PPL Electric [Member] | First Mortgage Bond [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           224            
Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 125           $ 125   125    
Maturity date   Sep. 01, 2044                    
Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds, Series 2000A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Aug. 01, 2030                    
Repurchased face amount   $ 83           83   83    
Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2002A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Oct. 01, 2032                    
Repurchased face amount   $ 42           42   42    
Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 96           $ 96   $ 96    
Stated interest rate   1.05%           1.05%   1.05%    
Maturity date     Sep. 01, 2042                  
Repurchase date of debt instruments     Sep. 01, 2019                  
Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2002C [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date     Oct. 01, 2032                  
Repurchased face amount   $ 96           $ 96   $ 96    
United Kingdom, Pounds [Member] | WPD East Midlands [Member] | Index Linked Term Loan [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount | £                       £ 100
Proceeds from debt, net of issuance costs | £         £ 100              
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           $ 116            
Maturity date           Mar. 09, 2029            
Interest rate at an initial term rate           0.90%            
Repurchase date of debt instruments           Sep. 01, 2017            
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           $ 108            
Maturity date           Mar. 09, 2027            
Interest rate at an initial term rate           0.90%            
Repurchase date of debt instruments           Aug. 15, 2017            
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate           4.70%            
Maturity date           Mar. 09, 2029            
Repurchased face amount           $ 116            
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series B [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate           4.75%            
Maturity date           Mar. 09, 2027            
Repurchased face amount           $ 108            
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount           $ 224            
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 125           125   125    
Maturity date   Sep. 01, 2044                    
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds, Series 2000A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Aug. 01, 2030                    
Repurchased face amount   $ 83           83   83    
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2002A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Oct. 01, 2032                    
Repurchased face amount   $ 42           42   42    
LG And E And KU Energy LLC [Member] | Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 96           $ 96   $ 96    
Stated interest rate   1.05%           1.05%   1.05%    
Maturity date     Sep. 01, 2042                  
Repurchase date of debt instruments     Sep. 01, 2019                  
LG And E And KU Energy LLC [Member] | Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2002C [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date     Oct. 01, 2032                  
Repurchased face amount   $ 96           $ 96   $ 96    
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 125           125   125    
Maturity date   Sep. 01, 2044                    
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds, Series 2000A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Aug. 01, 2030                    
Repurchased face amount   $ 83           83   83    
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Trimble County Pollution Control Revenue Refunding Bonds Series 2002A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date   Oct. 01, 2032                    
Repurchased face amount   $ 42           42   42    
Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2016a [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 96           $ 96   $ 96    
Stated interest rate   1.05%           1.05%   1.05%    
Maturity date     Sep. 01, 2042                  
Repurchase date of debt instruments     Sep. 01, 2019                  
Kentucky Utilities Co [Member] | Senior Debt Obligations [Member] | Carroll County Pollution Control Revenue Refunding Bonds Series 2002C [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Maturity date     Oct. 01, 2032                  
Repurchased face amount   $ 96           $ 96   $ 96    
Subsequent Event [Member] | WPD East Midlands [Member] | Index Linked Senior Unsecured Notes [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Stated interest rate 2.671%                      
Maturity date Jun. 01, 2043                      
Proceeds from debt, including premium net of debt issuance costs $ 101                      
Subsequent Event [Member] | United Kingdom, Pounds [Member] | WPD East Midlands [Member] | Index Linked Senior Unsecured Notes [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount 40                      
Proceeds from debt, net of issuance costs $ 83                      
At The Market Stock Offering Program [Member]                        
Equity Programs [Line Items]                        
Stock Issued During Period, Shares, New Issues | shares               710 436 710 858  
At-the-Market Stock Offering Program (Numeric) [Abstract]                        
Number of distribution agreements | Integer             2          
Aggregate sales price of common stock based on two separate equity distribution agreements             $ 500          
Average share price | $ / shares               $ 35.23 $ 32.95 $ 35.23 $ 33.33  
Net proceeds from issuance of common stock               $ 25 $ 14 $ 25 $ 28