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Leases - Lessee (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lease, Cost [Abstract] |  |  |  |  |  |  |  |
Operating lease cost | $ 30 | $ 33 |  |  |  |  |  |
Short-term lease cost | 9 | 7 |  |  |  |  |  |
Total lease cost | 39 | 40 |  |  |  |  |  |
Operating cash flows from operating leases | 26 | 29 |  |  |  |  |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 17 | 46 |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | $ 27
2021 |  |  |  |  |  |  | $ 22 |
2022 |  |  |  |  |  | $ 18 |  |
2023 |  |  |  |  | $ 15 |  |  |
2024 |  |  |  | $ 8 |  |  |  |
Thereafter |  |  | $ 20 |  |  |  |  |
Total | $ 110 |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Weighted-average discount rate | 3.35% |  |  |  |  |  |  |
Weighted-average remaining lease term (in years) | 8 years |  |  |  |  |  |  |
Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Current lease liabilities | $ 24 |  |  |  |  |  |  |
Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Non-current lease liabilities | 70 |  |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Right-of-use assets | 87 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |
Lease, Cost [Abstract] |  |  |  |  |  |  |  |
Operating lease cost | 22 | 25 |  |  |  |  |  |
Short-term lease cost | 2 | 2 |  |  |  |  |  |
Total lease cost | 24 | 27 |  |  |  |  |  |
Operating cash flows from operating leases | 18 | 21 |  |  |  |  |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 16 | 16 |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | 17
2021 |  |  |  |  |  |  | 13 |
2022 |  |  |  |  |  | 10 |  |
2023 |  |  |  |  | 8 |  |  |
2024 |  |  |  | 6 |  |  |  |
Thereafter |  |  | 3 |  |  |  |  |
Total | $ 57 |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Weighted-average discount rate | 3.66% |  |  |  |  |  |  |
Weighted-average remaining lease term (in years) | 4 years |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 1 year |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 10 years |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Current lease liabilities | $ 16 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Non-current lease liabilities | 37 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Right-of-use assets | 46 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |
Lease, Cost [Abstract] |  |  |  |  |  |  |  |
Operating lease cost | 8 | 12 |  |  |  |  |  |
Short-term lease cost | 1 | 1 |  |  |  |  |  |
Total lease cost | 9 | 13 |  |  |  |  |  |
Operating cash flows from operating leases | 7 | 9 |  |  |  |  |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 6 | 5 |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | 6
2021 |  |  |  |  |  |  | 5 |
2022 |  |  |  |  |  | 4 |  |
2023 |  |  |  |  | 3 |  |  |
2024 |  |  |  | 3 |  |  |  |
Thereafter |  |  | 1 |  |  |  |  |
Total | $ 22 |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Weighted-average discount rate | 3.53% |  |  |  |  |  |  |
Weighted-average remaining lease term (in years) | 4 years |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 1 year |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 10 years |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Current lease liabilities | $ 6 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Non-current lease liabilities | 15 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Right-of-use assets | 17 |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |
Lease, Cost [Abstract] |  |  |  |  |  |  |  |
Operating lease cost | 13 | 13 |  |  |  |  |  |
Short-term lease cost | 1 | 1 |  |  |  |  |  |
Total lease cost | 14 | 14 |  |  |  |  |  |
Operating cash flows from operating leases | 11 | 11 |  |  |  |  |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 9 | $ 11 |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | $ 10
2021 |  |  |  |  |  |  | $ 8 |
2022 |  |  |  |  |  | $ 6 |  |
2023 |  |  |  |  | $ 4 |  |  |
2024 |  |  |  | $ 3 |  |  |  |
Thereafter |  |  | $ 2 |  |  |  |  |
Total | $ 33 |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Weighted-average discount rate | 3.68% |  |  |  |  |  |  |
Weighted-average remaining lease term (in years) | 4 years |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 1 year |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term | 10 years |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Current lease liabilities | $ 9 |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Non-current lease liabilities | 21 |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |
Right-of-use assets | $ 27 |  |  |  |  |  |  |

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