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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Short-term Debt [Line Items]    
Capacity $ 2,350  
Commercial Paper Issuances 995 $ 474
Unused Capacity $ 1,355  
PPL Capital Funding [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.38% 1.64%
Capacity $ 1,000  
Commercial Paper Issuances 691 $ 230
Unused Capacity $ 309  
PPL Electric [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate
Capacity $ 650  
Commercial Paper Issuances 0 $ 0
Unused Capacity $ 650  
LGE [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.83%
Capacity $ 350  
Commercial Paper Issuances 176 $ 199
Unused Capacity $ 174  
KU [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.97%
Capacity $ 350  
Commercial Paper Issuances 128 $ 45
Unused Capacity $ 222  
PPL Electric Utilities Corp [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate
Capacity $ 650  
Commercial Paper Issuances 0 $ 0
Unused Capacity $ 650  
LG And E And KU Energy LLC [Member] | LGE [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.83%
Capacity $ 350  
Commercial Paper Issuances 176 $ 199
Unused Capacity $ 174  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.97%
Capacity $ 350  
Commercial Paper Issuances 128 $ 45
Unused Capacity $ 222  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.83%
Capacity $ 350  
Commercial Paper Issuances 176 $ 199
Unused Capacity $ 174  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted - Average Interest Rate 2.34% 1.97%
Capacity $ 350  
Commercial Paper Issuances 128 $ 45
Unused Capacity $ 222