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Financing Activities (Long-term Debt and Equity Securities) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2016
USD ($)
Feb. 26, 2015
USD ($)
Integer
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
At-the-Market Stock Offering Program (Numeric) [Abstract]        
Net proceeds from issuance of common stock     $ 42 $ 35
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 116   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 Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 108   $ 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 Secured Notes [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%   4.70%  
Maturity date Mar. 09, 2029      
Principal amount redeemed at par $ 116   $ 116  
PPL Electric [Member] | Senior Secured Notes [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%   4.75%  
Maturity date Mar. 09, 2027      
Principal amount redeemed at par $ 108   $ 108  
PPL Electric [Member] | First Mortgage Bond [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount 224   224  
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 116   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 Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 108   $ 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 Secured Notes [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%   4.70%  
Maturity date Mar. 09, 2029      
Principal amount redeemed at par $ 116   $ 116  
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series B [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 108   $ 108  
Stated interest rate 4.75%   4.75%  
Maturity date Mar. 09, 2027      
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member]        
Long-term Debt (Numeric) [Abstract]        
Principal amount $ 224   $ 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