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Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subject to amortization: [Abstract]      
Gross carrying amount $ 598 $ 576  
Accumulated amortization 222 204  
Not subject to amortization due to indefinite life: [Line Items]      
Gross carrying amount 367 345  
Gross carrying amount - other intangible assets 965 921  
Land Rights and Easements [Member]      
Not subject to amortization due to indefinite life: [Line Items]      
Gross carrying amount 361 339  
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 136 137  
Accumulated amortization 84 75  
Land Rights And Easements [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 440 418  
Accumulated amortization 135 128  
Licenses And Other [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 22 21  
Accumulated amortization 3 1  
Intangible assets with no regulatory offset [Member]      
Subject to amortization: [Abstract]      
Amortization expense 9 7 $ 6
Forecasted amortization in 2019 9    
Forecasted amortization in 2020 9    
Forecasted amortization in 2021 9    
Forecasted amortization in 2022 9    
Forecasted amortization in 2023 9    
Intangible assets with regulatory offset [Member]      
Subject to amortization: [Abstract]      
Amortization expense 9 8 9
Forecasted amortization in 2019 8    
Forecasted amortization in 2020 8    
Forecasted amortization in 2021 8    
Forecasted amortization in 2022 8    
Forecasted amortization in 2023 8    
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]      
Subject to amortization: [Abstract]      
Amortization expense 18 15 15
Forecasted amortization in 2019 17    
Forecasted amortization in 2020 17    
Forecasted amortization in 2021 17    
Forecasted amortization in 2022 17    
Forecasted amortization in 2023 17    
PPL Electric Utilities Corp [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 373 365  
Accumulated amortization 126 122  
Not subject to amortization due to indefinite life: [Line Items]      
Gross carrying amount - other intangible assets 390 382  
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 370 363  
Accumulated amortization 125 121  
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 3 2  
Accumulated amortization 1 1  
LG And E And KU Energy LLC [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 147 147  
Accumulated amortization 78 69  
LG And E And KU Energy LLC [Member] | Land Rights And Easements [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 22 21  
Accumulated amortization 4 3  
LG And E And KU Energy LLC [Member] | OVEC power purchase agreement [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 125 126  
Accumulated amortization 74 66  
LG And E And KU Energy LLC [Member] | Intangible assets with regulatory offset [Member]      
Subject to amortization: [Abstract]      
Amortization expense 9 8 9
Forecasted amortization in 2019 8    
Forecasted amortization in 2020 8    
Forecasted amortization in 2021 8    
Forecasted amortization in 2022 8    
Forecasted amortization in 2023 8    
Louisville Gas And Electric Co [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 93 94  
Accumulated amortization 52 47  
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 87  
Accumulated amortization 51 46  
Louisville Gas And Electric Co [Member] | Intangible assets with regulatory offset [Member]      
Subject to amortization: [Abstract]      
Amortization expense 6 6 6
Forecasted amortization in 2019 6    
Forecasted amortization in 2020 6    
Forecasted amortization in 2021 6    
Forecasted amortization in 2022 6    
Forecasted amortization in 2023 6    
Kentucky Utilities Co [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 54 53  
Accumulated amortization 26 22  
Kentucky Utilities Co [Member] | Land Rights And Easements [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 15 14  
Accumulated amortization 3 2  
Kentucky Utilities Co [Member] | OVEC power purchase agreement [Member]      
Subject to amortization: [Abstract]      
Gross carrying amount 39 39  
Accumulated amortization 23 20  
Kentucky Utilities Co [Member] | Intangible assets with regulatory offset [Member]      
Subject to amortization: [Abstract]      
Amortization expense 3 $ 2 $ 3
Forecasted amortization in 2019 2    
Forecasted amortization in 2020 2    
Forecasted amortization in 2021 2    
Forecasted amortization in 2022 2    
Forecasted amortization in 2023 $ 2