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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Short-term Debt [Line Items]    
Capacity $ 2,925  
Commercial paper issuances 69 $ 867
Unused capacity $ 2,856  
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]    
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 0.31% 0.28%
Capacity $ 425  
Commercial paper issuances 69 $ 262
Unused capacity $ 356  
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]    
Weighted-average interest rate
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 0.31% 0.28%
Capacity $ 425  
Commercial paper issuances 69 $ 262
Unused capacity $ 356  
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