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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Short-term Debt [Line Items]      
Capacity $ 2,925    
Commercial Paper Issuances 0   $ 867
Unused Capacity 2,925    
PPL Capital Funding [Member]      
Short-term Debt [Line Items]      
Weighted - Average Interest Rate     0.25%
Capacity 1,500    
Commercial Paper Issuances 0   $ 402
Unused Capacity 1,500    
PPL Electric [Member]      
Short-term Debt [Line Items]      
Capacity 650    
Commercial Paper Issuances 0   $ 0
Unused Capacity 650    
LGE [Member]      
Short-term Debt [Line Items]      
Weighted - Average Interest Rate     0.28%
Capacity 425 $ 425 $ 350
Commercial Paper Issuances 0   $ 262
Unused Capacity 425    
KU [Member]      
Short-term Debt [Line Items]      
Weighted - Average Interest Rate     0.28%
Capacity 350    
Commercial Paper Issuances 0   $ 203
Unused Capacity 350    
PPL Electric Utilities Corp [Member]      
Short-term Debt [Line Items]      
Capacity 650    
Commercial Paper Issuances 0   $ 0
Unused Capacity 650    
Louisville Gas And Electric Co [Member]      
Short-term Debt [Line Items]      
Weighted - Average Interest Rate     0.28%
Capacity 425 $ 425 $ 350
Commercial Paper Issuances 0   $ 262
Unused Capacity 425    
Kentucky Utilities Co [Member]      
Short-term Debt [Line Items]      
Weighted - Average Interest Rate     0.28%
Capacity 350    
Commercial Paper Issuances 0   $ 203
Unused Capacity $ 350