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Financing Activities (Short-term Debt) (Details) (Commercial Paper [Member], USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Mar. 31, 2013
PPL Energy Supply [Member]
      
Short-term Debt [Line Items]      
Capacity $ 750    
Commercial paper outstanding 575 356  
Weighted-average interest rate on outstanding commercial paper 0.29% 0.50%  
PPL Electric [Member]
      
Short-term Debt [Line Items]      
Capacity 300    
Commercial paper outstanding 85    
Weighted-average interest rate on outstanding commercial paper 0.34%    
LGE [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding 80 55  
Weighted-average interest rate on outstanding commercial paper 0.32% 0.42%  
KU [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding 172 70  
Weighted-average interest rate on outstanding commercial paper 0.33% 0.42%  
PPL Energy Supply LLC [Member]
      
Short-term Debt [Line Items]      
Capacity 750    
Commercial paper outstanding 575 356  
Weighted-average interest rate on outstanding commercial paper 0.29% 0.50%  
PPL Electric Utilities Corp [Member]
      
Short-term Debt [Line Items]      
Capacity 300    
Commercial paper outstanding 85    
Weighted-average interest rate on outstanding commercial paper 0.34%    
LG And E And KU Energy LLC [Member] | LGE [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding 80 55  
Weighted-average interest rate on outstanding commercial paper 0.32% 0.42%  
LG And E And KU Energy LLC [Member] | KU [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding 172 70  
Weighted-average interest rate on outstanding commercial paper 0.33% 0.42%  
Louisville Gas And Electric Co [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding 80 55  
Weighted-average interest rate on outstanding commercial paper 0.32% 0.42%  
Kentucky Utilities Co [Member]
      
Short-term Debt [Line Items]      
Capacity 350   250
Commercial paper outstanding $ 172 $ 70  
Weighted-average interest rate on outstanding commercial paper 0.33% 0.42%