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Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Subject to amortization: [Abstract]                
Gross carrying amount $ 617 $ 598            
Accumulated amortization 239 222            
Not subject to amortization due to indefinite life: [Line Items]                
Gross carrying amount 386 367            
Gross carrying amount - other intangible assets 1,003 965            
Land Rights and Easements [Member]                
Not subject to amortization due to indefinite life: [Line Items]                
Gross carrying amount 380 361            
Other [Member]                
Not subject to amortization due to indefinite life: [Line Items]                
Gross carrying amount 6 6            
Contracts [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 136 136            
Accumulated amortization 93 84            
Land Rights And Easements [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 460 440            
Accumulated amortization 142 135            
Licenses And Other [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 21 22            
Accumulated amortization 4 3            
Intangible assets with no regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense 11 9 $ 7          
Forecasted amortization in 2021               $ 11
Forecasted amortization in 2022             $ 11  
Forecasted amortization in 2023           $ 11    
Forecasted amortization in 2024         $ 11      
Forecasted amortization in 2025       $ 11        
Intangible assets with regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense 8 9 8          
Forecasted amortization in 2021               8
Forecasted amortization in 2022             8  
Forecasted amortization in 2023           8    
Forecasted amortization in 2024         8      
Forecasted amortization in 2025       8        
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]                
Subject to amortization: [Abstract]                
Amortization expense 19 18 15          
Forecasted amortization in 2021               19
Forecasted amortization in 2022             19  
Forecasted amortization in 2023           19    
Forecasted amortization in 2024         19      
Forecasted amortization in 2025       19        
PPL Electric Utilities Corp [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 381 373            
Accumulated amortization 130 126            
Not subject to amortization due to indefinite life: [Line Items]                
Gross carrying amount - other intangible assets 398 390            
PPL Electric Utilities Corp [Member] | Land Rights and Easements [Member]                
Not subject to amortization due to indefinite life: [Line Items]                
Gross carrying amount 17 17            
PPL Electric Utilities Corp [Member] | Land Rights And Easements [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 379 370            
Accumulated amortization 129 125            
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 2 3            
Accumulated amortization 1 1            
LG And E And KU Energy LLC [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 147 147            
Accumulated amortization 86 78            
LG And E And KU Energy LLC [Member] | Land Rights And Easements [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 22 22            
Accumulated amortization 4 4            
LG And E And KU Energy LLC [Member] | OVEC power purchase agreement [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 125 125            
Accumulated amortization 82 74            
LG And E And KU Energy LLC [Member] | Intangible assets with regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense 8 9 8          
Forecasted amortization in 2021               8
Forecasted amortization in 2022             8  
Forecasted amortization in 2023           8    
Forecasted amortization in 2024         8      
Forecasted amortization in 2025       8        
Louisville Gas And Electric Co [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 93 93            
Accumulated amortization 58 52            
Louisville Gas And Electric Co [Member] | Land Rights And Easements [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 7 7            
Accumulated amortization 1 1            
Louisville Gas And Electric Co [Member] | OVEC power purchase agreement [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 86 86            
Accumulated amortization 57 51            
Louisville Gas And Electric Co [Member] | Intangible assets with regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense 6 6 6          
Forecasted amortization in 2021 6              
Forecasted amortization in 2022 6              
Forecasted amortization in 2023 6              
Forecasted amortization in 2024 6              
Forecasted amortization in 2025 6              
Kentucky Utilities Co [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 54 54            
Accumulated amortization 28 26            
Kentucky Utilities Co [Member] | Land Rights And Easements [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 15 15            
Accumulated amortization 3 3            
Kentucky Utilities Co [Member] | OVEC power purchase agreement [Member]                
Subject to amortization: [Abstract]                
Gross carrying amount 39 39            
Accumulated amortization 25 23            
Kentucky Utilities Co [Member] | Intangible assets with regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense 2 3 2          
Forecasted amortization in 2021 2              
Forecasted amortization in 2022 2              
Forecasted amortization in 2023 2              
Forecasted amortization in 2024 2              
Forecasted amortization in 2025 2              
PPL Electric [Member] | Intangible assets with no regulatory offset [Member]                
Subject to amortization: [Abstract]                
Amortization expense $ 4 $ 4 $ 4          
Forecasted amortization in 2021               $ 4
Forecasted amortization in 2022             $ 4  
Forecasted amortization in 2023           $ 4    
Forecasted amortization in 2024         $ 4      
Forecasted amortization in 2025       $ 4