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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Capacity $ 2,100  
Commercial paper issuances 1,014 $ 641
Unused capacity $ 1,086  
PPL Capital Funding [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.85% 0.78%
Capacity $ 1,000  
Commercial paper issuances 773 $ 451
Unused capacity $ 227  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.72%  
Capacity $ 400  
Commercial paper issuances 125  
Unused capacity $ 275  
LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.79% 0.71%
Capacity $ 350  
Commercial paper issuances 82 $ 142
Unused capacity $ 268  
KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.64% 0.72%
Capacity $ 350  
Commercial paper issuances 34 $ 48
Unused capacity $ 316  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.72%  
Capacity $ 400  
Commercial paper issuances 125  
Unused capacity $ 275  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.79% 0.71%
Capacity $ 350  
Commercial paper issuances 82 $ 142
Unused capacity $ 268  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.64% 0.72%
Capacity $ 350  
Commercial paper issuances 34 $ 48
Unused capacity $ 316  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.79% 0.71%
Capacity $ 350  
Commercial paper issuances 82 $ 142
Unused capacity $ 268  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.64% 0.72%
Capacity $ 350  
Commercial paper issuances 34 $ 48
Unused capacity $ 316