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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]      
Capacity   $ 2,100  
Commercial paper issuances   500 $ 641
Unused capacity   1,600  
PPL Electric [Member]      
Short-term Debt [Line Items]      
Capacity   400  
Commercial paper issuances   $ 295 0
Weighted-average interest rate   1.05%  
Unused capacity   $ 105  
PPL Electric [Member] | Subsequent Event [Member]      
Short-term Debt [Line Items]      
Capacity $ 650    
LGE [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 169 $ 142
Weighted-average interest rate   0.94% 0.71%
Unused capacity   $ 181  
KU [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 16 $ 48
Weighted-average interest rate   0.87% 0.72%
Unused capacity   $ 334  
PPL Capital Funding [Member]      
Short-term Debt [Line Items]      
Capacity   1,000  
Commercial paper issuances   $ 20 $ 451
Weighted-average interest rate   1.10% 0.78%
Unused capacity   $ 980  
PPL Electric Utilities Corp [Member]      
Short-term Debt [Line Items]      
Capacity   400  
Commercial paper issuances   $ 295 $ 0
Weighted-average interest rate   1.05%  
Unused capacity   $ 105  
PPL Electric Utilities Corp [Member] | Subsequent Event [Member]      
Short-term Debt [Line Items]      
Capacity $ 650    
LG And E And KU Energy LLC [Member] | LGE [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 169 $ 142
Weighted-average interest rate   0.94% 0.71%
Unused capacity   $ 181  
LG And E And KU Energy LLC [Member] | KU [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 16 $ 48
Weighted-average interest rate   0.87% 0.72%
Unused capacity   $ 334  
Louisville Gas And Electric Co [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 169 $ 142
Weighted-average interest rate   0.94% 0.71%
Unused capacity   $ 181  
Kentucky Utilities Co [Member]      
Short-term Debt [Line Items]      
Capacity   350  
Commercial paper issuances   $ 16 $ 48
Weighted-average interest rate   0.87% 0.72%
Unused capacity   $ 334