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Financing Activities - Long-term Debt and ATM Program (Details)
$ / shares in Units, £ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2016
USD ($)
May 31, 2016
GBP (£)
Mar. 31, 2016
USD ($)
Feb. 26, 2015
USD ($)
Integer
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
May 31, 2016
GBP (£)
At-the-Market Stock Offering Program (Numeric) [Abstract]                
Net proceeds from issuance of common stock           $ 76 $ 83  
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          
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]                
Principal amount     $ 108          
Stated interest rate     4.75%          
Maturity date     Mar. 09, 2027          
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member]                
Long-term Debt (Numeric) [Abstract]                
Principal amount     $ 224          
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        
Shares of common stock issued during the period (in shares) | shares         421,700   421,700  
Shares issued (dollars per share) | $ / shares         $ 33.73   $ 33.73  
Net proceeds from issuance of common stock         $ 14   $ 14