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Goodwill and Other Intangible Assets (Other Intangibles - Finite-Lived) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | $ 551 | $ 547 |
Accumulated amortization | 231 | 219 |
Contracts [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 125 | 125 |
Accumulated amortization | 90 | 82 |
Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 406 | 401 |
Accumulated amortization | 135 | 133 |
Licenses And Other [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 20 | 21 |
Accumulated amortization | 6 | 4 |
Intangible assets with no regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 9 | 7 | $ 6
Forecasted amortization in 2021 | 5 |  |
Forecasted amortization in 2022 | 5 |  |
Forecasted amortization in 2023 | 5 |  |
Forecasted amortization in 2024 | 5 |  |
Forecasted amortization in 2025 | 5 |  |
Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 8 | 8 | 9
Forecasted amortization in 2021 | 8 |  |
Forecasted amortization in 2022 | 8 |  |
Forecasted amortization in 2023 | 9 |  |
Forecasted amortization in 2024 | 9 |  |
Forecasted amortization in 2025 | 2 |  |
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 17 | 15 | 15
Forecasted amortization in 2021 | 13 |  |
Forecasted amortization in 2022 | 13 |  |
Forecasted amortization in 2023 | 14 |  |
Forecasted amortization in 2024 | 14 |  |
Forecasted amortization in 2025 | 7 |  |
PPL Electric Utilities Corp [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 384 | 381 |
Accumulated amortization | 131 | 130 |
PPL Electric Utilities Corp [Member] | Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 382 | 379 |
Accumulated amortization | 130 | 129 |
PPL Electric Utilities Corp [Member] | Licenses And Other [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 2 | 2 |
Accumulated amortization | 1 | 1 |
PPL Electric Utilities Corp [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 |  |
Louisville Gas And Electric Co [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 93 | 93 |
Accumulated amortization | 63 | 58 |
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 | 62 | 57 |
Louisville Gas And Electric Co [Member] | Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 5 | 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 | 1 |  |
Kentucky Utilities Co [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 55 | 54 |
Accumulated amortization | 32 | 28 |
Kentucky Utilities Co [Member] | Land Rights And Easements [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 16 | 15 |
Accumulated amortization | 4 | 3 |
Kentucky Utilities Co [Member] | OVEC power purchase agreement [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Gross carrying amount | 39 | 39 |
Accumulated amortization | 28 | 25 |
Kentucky Utilities Co [Member] | Intangible assets with no regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 1 | 0 | 0
Kentucky Utilities Co [Member] | Intangible assets with regulatory offset [Member] |  |  |
Subject to amortization: [Abstract] |  |  |
Amortization expense | 3 | $ 2 | $ 3
Forecasted amortization in 2021 | 2 |  |
Forecasted amortization in 2022 | 2 |  |
Forecasted amortization in 2023 | 3 |  |
Forecasted amortization in 2024 | 3 |  |
Forecasted amortization in 2025 | $ 1 |  |

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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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