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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Capacity $ 2,100  
Commercial paper issuances 465 $ 641
Unused capacity $ 1,635  
PPL Capital Funding [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.84% 0.78%
Capacity $ 1,000  
Commercial paper issuances 320 $ 451
Unused capacity $ 680  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.75%  
Capacity $ 400  
Commercial paper issuances 6  
Unused capacity $ 394  
LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.71%
Capacity $ 350  
Commercial paper issuances 110 $ 142
Unused capacity $ 240  
KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.72%
Capacity $ 350  
Commercial paper issuances 29 $ 48
Unused capacity $ 321  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.75%  
Capacity $ 400  
Commercial paper issuances 6  
Unused capacity $ 394  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.71%
Capacity $ 350  
Commercial paper issuances 110 $ 142
Unused capacity $ 240  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.72%
Capacity $ 350  
Commercial paper issuances 29 $ 48
Unused capacity $ 321  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.71%
Capacity $ 350  
Commercial paper issuances 110 $ 142
Unused capacity $ 240  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 0.70% 0.72%
Capacity $ 350  
Commercial paper issuances 29 $ 48
Unused capacity $ 321