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Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | $ 576 | $ 528 |
Accumulated amortization | 204 | 190 |
Not subject to amortization due to indefinite life: [Line Items] |  |  |
Gross carrying amount | 345 | 359 |
Gross carrying amount - other intangible assets | 921 | 887 |
Land Rights and Easements [Member] |  |  |
Not subject to amortization due to indefinite life: [Line Items] |  |  |
Gross carrying amount | 339 | 359 |
Other [Member] |  |  |
Not subject to amortization due to indefinite life: [Line Items] |  |  |
Gross carrying amount | 6 | 0 |
Contracts [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 137 | 138 |
Accumulated amortization | 75 | 67 |
Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 418 | 382 |
Accumulated amortization | 128 | 120 |
Licenses And Other [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 21 | 8 |
Accumulated amortization | 1 | 3 |
Intangible assets with no regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 7 | 6 | $ 6
Forecasted amortization in 2019 | 7 |  |
Forecasted amortization in 2020 | 7 |  |
Forecasted amortization in 2021 | 7 |  |
Forecasted amortization in 2022 | 7 |  |
Forecasted amortization in 2023 | 7 |  |
Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 8 | 9 | 24
Forecasted amortization in 2019 | 9 |  |
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 | 15 | 15 | 30
Forecasted amortization in 2019 | 16 |  |
Forecasted amortization in 2020 | 15 |  |
Forecasted amortization in 2021 | 15 |  |
Forecasted amortization in 2022 | 15 |  |
Forecasted amortization in 2023 | 15 |  |
PPL Electric Utilities Corp [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 365 | 364 |
Accumulated amortization | 122 | 118 |
Not subject to amortization due to indefinite life: [Line Items] |  |  |
Gross carrying amount - other intangible assets | 382 | 377 |
PPL Electric Utilities Corp [Member] | Land Rights and Easements [Member] |  |  |
Not subject to amortization due to indefinite life: [Line Items] |  |  |
Gross carrying amount | 17 | 13 |
PPL Electric Utilities Corp [Member] | Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 363 | 361 |
Accumulated amortization | 121 | 117 |
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 | 69 | 61 |
LG And E And KU Energy LLC [Member] | Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 21 | 21 |
Accumulated amortization | 3 | 3 |
LG And E And KU Energy LLC [Member] | OVEC power purchase agreement [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 126 | 126 |
Accumulated amortization | 66 | 58 |
LG And E And KU Energy LLC [Member] | Intangible assets with no regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 0 | 0 | 1
LG And E And KU Energy LLC [Member] | Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 8 | 9 | 24
Forecasted amortization in 2019 | 9 |  |
Forecasted amortization in 2020 | 8 |  |
Forecasted amortization in 2021 | 8 |  |
Forecasted amortization in 2022 | 8 |  |
Forecasted amortization in 2023 | 8 |  |
LG And E And KU Energy LLC [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 8 | 9 | 25
Louisville Gas And Electric Co [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 94 | 94 |
Accumulated amortization | 47 | 41 |
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 | 87 | 87 |
Accumulated amortization | 46 | 40 |
Louisville Gas And Electric Co [Member] | Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 6 | 6 | 13
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 | 53 | 53 |
Accumulated amortization | 22 | 20 |
Kentucky Utilities Co [Member] | Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 14 | 14 |
Accumulated amortization | 2 | 2 |
Kentucky Utilities Co [Member] | OVEC power purchase agreement [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 39 | 39 |
Accumulated amortization | 20 | 18 |
Kentucky Utilities Co [Member] | Intangible assets with no regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 0 | 0 | 1
Kentucky Utilities Co [Member] | Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 2 | 3 | 11
Forecasted amortization in 2019 | 3 |  |
Forecasted amortization in 2020 | 2 |  |
Forecasted amortization in 2021 | 2 |  |
Forecasted amortization in 2022 | 2 |  |
Forecasted amortization in 2023 | 2 |  |
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | $ 2 | $ 3 | $ 12

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