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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
Jun. 30, 2017
mi
Jul. 31, 2014
claim
Dec. 31, 2013
resident
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 01, 2015
Claim By Former Affiliate [Abstract]                
Restructuring And Related Activities Ownership Percentage By Riverstone               35.00%
Amount Of Alleged Improper Distribution $ 733              
LKE [Member] | Power Purchase [Member]                
Energy Purchase Commitments (Numeric) [Abstract]                
2020         $ 31      
2021         31      
2022         31      
2023         31      
2024         31      
Thereafter         399      
Total         554      
Purchases         22 $ 20 $ 20  
LGE [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of residents that filed class action suit | resident       6        
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1          
LGE [Member] | Minimum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   1            
LGE [Member] | Maximum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   3            
LG And E And KU Energy LLC [Member] | Power Purchase [Member]                
Energy Purchase Commitments (Numeric) [Abstract]                
2020         31      
2021         31      
2022         31      
2023         31      
2024         31      
Thereafter         399      
Total         554      
Purchases         22 20 20  
LG And E And KU Energy LLC [Member] | LGE [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of residents that filed class action suit | resident       6        
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1          
LG And E And KU Energy LLC [Member] | LGE [Member] | Minimum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   1            
LG And E And KU Energy LLC [Member] | LGE [Member] | Maximum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   3            
Louisville Gas And Electric Co [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of residents that filed class action suit | resident       6        
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1          
Louisville Gas And Electric Co [Member] | Minimum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   1            
Louisville Gas And Electric Co [Member] | Maximum [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Number of miles within plant that would include a class of residents | mi   3            
Louisville Gas And Electric Co [Member] | Power Purchase [Member]                
Energy Purchase Commitments (Numeric) [Abstract]                
2020         21      
2021         21      
2022         21      
2023         21      
2024         22      
Thereafter         276      
Total         382      
Purchases         15 14 14  
Kentucky Utilities Co [Member] | Power Purchase [Member]                
Energy Purchase Commitments (Numeric) [Abstract]                
2020         10      
2021         10      
2022         10      
2023         10      
2024         9      
Thereafter         123      
Total         172      
Purchases         7 6 $ 6  
PPL Electric Additional Sites [Member] | PPL Electric [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Accrual for Environmental Loss Contingencies         10 11    
PPL Electric Additional Sites [Member] | PPL Electric Utilities Corp [Member]                
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]                
Accrual for Environmental Loss Contingencies         $ 10 $ 11