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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Capacity $ 1,000  
Commercial paper issuances 654 $ 500
Unused capacity $ 346  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.42%  
Capacity $ 300  
Commercial paper issuances 168  
Unused capacity $ 132  
LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.49% 0.42%
Capacity $ 350  
Commercial paper issuances 259 $ 264
Unused capacity $ 91  
KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.48% 0.49%
Capacity $ 350  
Commercial paper issuances 227 $ 236
Unused capacity $ 123  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.42%  
Capacity $ 300  
Commercial paper issuances 168  
Unused capacity $ 132  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.49% 0.42%
Capacity $ 350  
Commercial paper issuances 259 $ 264
Unused capacity $ 91  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.48% 0.49%
Capacity $ 350  
Commercial paper issuances 227 $ 236
Unused capacity $ 123  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.49% 0.42%
Capacity $ 350  
Commercial paper issuances 259 $ 264
Unused capacity $ 91  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.48% 0.49%
Capacity $ 350  
Commercial paper issuances 227 $ 236
Unused capacity $ 123