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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Capacity $ 1,000  
Commercial paper issuances 68 $ 500
Unused capacity 932  
PPL Capital Funding [Member] | Subsequent Event [Member]    
Short-term Debt [Line Items]    
Commercial paper issuances $ 600  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.41%  
Capacity $ 300  
Commercial paper issuances 68  
Unused capacity 232  
LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.42%
Capacity 350  
Commercial paper issuances   $ 264
Unused capacity 350  
KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.49%
Capacity 350  
Commercial paper issuances   $ 236
Unused capacity $ 350  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.41%  
Capacity $ 300  
Commercial paper issuances 68  
Unused capacity 232  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.42%
Capacity 350  
Commercial paper issuances   $ 264
Unused capacity 350  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.49%
Capacity 350  
Commercial paper issuances   $ 236
Unused capacity 350  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.42%
Capacity 350  
Commercial paper issuances   $ 264
Unused capacity 350  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate   0.49%
Capacity 350  
Commercial paper issuances   $ 236
Unused capacity $ 350