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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Capacity $ 1,600  
Commercial paper issuances 641 $ 500
Unused capacity 959  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Capacity 300  
Commercial paper issuances 0 0
Unused capacity 300  
LGE [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 142 $ 264
Weighted-average interest rate 0.71% 0.42%
Unused capacity $ 208  
KU [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 48 $ 236
Weighted-average interest rate 0.72% 0.49%
Unused capacity $ 302  
PPL Capital Funding [Member]    
Short-term Debt [Line Items]    
Capacity 600  
Commercial paper issuances $ 451 $ 0
Weighted-average interest rate 0.78%  
Unused capacity $ 149  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Capacity 300  
Commercial paper issuances 0 0
Unused capacity 300  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 142 $ 264
Weighted-average interest rate 0.71% 0.42%
Unused capacity $ 208  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 48 $ 236
Weighted-average interest rate 0.72% 0.49%
Unused capacity $ 302  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 142 $ 264
Weighted-average interest rate 0.71% 0.42%
Unused capacity $ 208  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Capacity 350  
Commercial paper issuances $ 48 $ 236
Weighted-average interest rate 0.72% 0.49%
Unused capacity $ 302