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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Short-term Debt [Line Items]    
Capacity $ 2,350  
Commercial paper issuances 1,183 $ 474
Unused capacity $ 1,167  
PPL Capital Funding [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 2.82% 1.64%
Capacity $ 1,000  
Commercial paper issuances 669 $ 230
Unused capacity $ 331  
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 2.94% 1.83%
Capacity $ 350  
Commercial paper issuances 279 $ 199
Unused capacity $ 71  
KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 2.94% 1.97%
Capacity $ 350  
Commercial paper issuances 235 $ 45
Unused capacity $ 115  
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 2.94% 1.83%
Capacity $ 350  
Commercial paper issuances 279 $ 199
Unused capacity $ 71  
LG And E And KU Energy LLC [Member] | KU [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 2.94% 1.97%
Capacity $ 350  
Commercial paper issuances 235 $ 45
Unused capacity $ 115  
Louisville Gas And Electric Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 2.94% 1.83%
Capacity $ 350  
Commercial paper issuances 279 $ 199
Unused capacity $ 71  
Kentucky Utilities Co [Member]    
Short-term Debt [Line Items]    
Weighted-average interest rate 2.94% 1.97%
Capacity $ 350  
Commercial paper issuances 235 $ 45
Unused capacity $ 115