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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 |  |

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