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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
Sep. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
May 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
GBP (£)
Feb. 28, 2015
USD ($)
Integer
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
At-the-Market Stock Offering Program (Numeric) [Abstract]                        
Net proceeds from issuance of common stock                     $ 275 $ 133
WPD South Wales PLC [Member] | Index Linked Senior Unsecured Notes [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount | £             £ 50          
Stated interest rate             0.01%          
Proceeds from debt, net of issuance costs | £             £ 53          
Maturity date           Mar. 31, 2029 Mar. 31, 2029          
Proceeds from debt, including premium net of debt issuance costs           $ 64            
PPL Capital Funding [Member] | Senior Debt Obligations [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount $ 500               $ 500   $ 500  
Stated interest rate 4.00%               4.00%   4.00%  
Maturity date Dec. 31, 2047                      
Proceeds from debt, including premium net of debt issuance costs $ 490                      
PPL Electric [Member] | First Mortgage [Member] | Mortgage Indenture 2001 [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount       $ 475                
Stated interest rate       3.95%                
Proceeds from debt, net of issuance costs       $ 466                
Maturity date       Dec. 31, 2047                
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 108                    
Stated interest rate   1.80%                    
Maturity date   Dec. 31, 2027                    
Repurchase date of debt instruments   Aug. 15, 2022                    
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount $ 116               $ 116   $ 116  
Stated interest rate 1.80%               1.80%   1.80%  
Maturity date Dec. 31, 2029                      
Repurchase date of debt instruments Sep. 01, 2022                      
LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount         $ 128              
Stated interest rate         1.50%              
Maturity date         Dec. 31, 2033              
Repurchase date of debt instruments         Apr. 01, 2019              
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Stated interest rate     3.75%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 01, 2027                  
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Maturity date     Dec. 31, 2033                  
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 31                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 35                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
PPL Electric Utilities Corp [Member] | First Mortgage [Member] | Mortgage Indenture 2001 [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount       $ 475                
Stated interest rate       3.95%                
Proceeds from debt, net of issuance costs       $ 466                
Maturity date       Dec. 31, 2047                
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount   $ 108                    
Stated interest rate   1.80%                    
Maturity date   Dec. 31, 2027                    
Repurchase date of debt instruments   Aug. 15, 2022                    
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount $ 116               $ 116   $ 116  
Stated interest rate 1.80%               1.80%   1.80%  
Maturity date Dec. 31, 2029                      
Repurchase date of debt instruments Sep. 01, 2022                      
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount         $ 128              
Stated interest rate         1.50%              
Maturity date         Dec. 31, 2033              
Repurchase date of debt instruments         Apr. 01, 2019              
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Stated interest rate     3.75%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 01, 2027                  
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Maturity date     Dec. 31, 2033                  
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 31                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 35                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount         $ 128              
Stated interest rate         1.50%              
Maturity date         Dec. 31, 2033              
Repurchase date of debt instruments         Apr. 01, 2019              
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Stated interest rate     3.75%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 01, 2027                  
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 60                  
Maturity date     Dec. 31, 2033                  
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 31                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member]                        
Long-term Debt (Numeric) [Abstract]                        
Principal amount     $ 35                  
Stated interest rate     1.25%                  
Maturity date     Dec. 31, 2033                  
Repurchase date of debt instruments     Jun. 03, 2019                  
At The Market Stock Offering Program [Member]                        
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        
Stock Issued During Period, Shares, New Issues | shares                 2,049 710 5,526 710
Average share price | $ / shares                 $ 39.04 $ 35.23 $ 38.49 $ 35.23
Net proceeds from issuance of common stock                 $ 79 $ 25 $ 211 $ 25