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Financing Activities - Short-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Capacity $ 2,850  
Commercial Paper Issuances 1,530 $ 1,183
Unused Capacity $ 1,320  
PPL Capital Funding [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.88% 2.82%
Capacity $ 1,500  
Commercial Paper Issuances 968 $ 669
Unused Capacity $ 532  
PPL Electric [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75%
Capacity $ 650  
Commercial Paper Issuances 60 $ 0
Unused Capacity 590  
LGE [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Commercial Paper Issuances $ 200  
LGE [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 269 $ 279
Unused Capacity $ 81  
KU [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 233 $ 235
Unused Capacity $ 117  
PPL Electric Utilities Corp [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75%
Capacity $ 650  
Commercial Paper Issuances 60 $ 0
Unused Capacity 590  
LG And E And KU Energy LLC [Member] | LGE [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Commercial Paper Issuances $ 200  
LG And E And KU Energy LLC [Member] | LGE [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 269 $ 279
Unused Capacity $ 81  
LG And E And KU Energy LLC [Member] | KU [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 233 $ 235
Unused Capacity 117  
Louisville Gas And Electric Co [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Commercial Paper Issuances $ 200  
Louisville Gas And Electric Co [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 269 $ 279
Unused Capacity $ 81  
Kentucky Utilities Co [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.75% 2.94%
Capacity $ 350  
Commercial Paper Issuances 233 $ 235
Unused Capacity $ 117