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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 |  |  |  |

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