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Leases - Lessee (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lease, Cost [Abstract] |  |  |
Operating lease cost | $ 33 |  |
Short-term lease cost | 7 |  |
Total lease cost | 40 |  |
Operating cash flows from operating leases | 29 |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 46 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2020 | 29 |  |
2021 | 22 |  |
2022 | 17 |  |
2023 | 15 |  |
2024 | 12 |  |
Thereafter | 27 |  |
Total | $ 122 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.48% |  |
Weighted-average remaining lease term (in years) | 8 years |  |
2019 |  |  | $ 26
2020 |  |  | 21
2021 |  |  | 15
2022 |  |  | 13
2023 |  |  | 8
Thereafter |  |  | 33
Total |  |  | 116
Other Current Liabilities [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Current lease liabilities | $ 26 | $ 23 |
Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Non-current lease liabilities | 78 | 67 |
Other Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | 96 | 81 |
LG And E And KU Energy LLC [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | 25 |  |
Short-term lease cost | 2 |  |
Total lease cost | 27 |  |
Operating cash flows from operating leases | 21 |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 16 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2020 | 18 |  |
2021 | 13 |  |
2022 | 9 |  |
2023 | 7 |  |
2024 | 6 |  |
Thereafter | 8 |  |
Total | $ 61 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.96% |  |
Weighted-average remaining lease term (in years) | 5 years |  |
2019 |  |  | 20
2020 |  |  | 15
2021 |  |  | 11
2022 |  |  | 7
2023 |  |  | 6
Thereafter |  |  | 11
Total |  |  | 70
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 | 18 |
LG And E And KU Energy LLC [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Non-current lease liabilities | 39 | 46 |
LG And E And KU Energy LLC [Member] | Other Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | 47 | 56 |
Louisville Gas And Electric Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | 12 |  |
Short-term lease cost | 1 |  |
Total lease cost | 13 |  |
Operating cash flows from operating leases | 9 |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 5 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2020 | 7 |  |
2021 | 5 |  |
2022 | 4 |  |
2023 | 3 |  |
2024 | 2 |  |
Thereafter | 3 |  |
Total | $ 24 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.89% |  |
Weighted-average remaining lease term (in years) | 5 years |  |
2019 |  |  | 10
2020 |  |  | 6
2021 |  |  | 4
2022 |  |  | 3
2023 |  |  | 3
Thereafter |  |  | 4
Total |  |  | 30
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 | 9 |
Louisville Gas And Electric Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Non-current lease liabilities | 15 | 18 |
Louisville Gas And Electric Co [Member] | Other Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | 18 | 23 |
Kentucky Utilities Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | 13 |  |
Short-term lease cost | 1 |  |
Total lease cost | 14 |  |
Operating cash flows from operating leases | 11 |  |
Right-of-use asset obtained in exchange for new operating lease liabilities | 11 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2020 | 11 |  |
2021 | 8 |  |
2022 | 5 |  |
2023 | 4 |  |
2024 | 4 |  |
Thereafter | 4 |  |
Total | $ 36 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 4.01% |  |
Weighted-average remaining lease term (in years) | 5 years |  |
2019 |  |  | 10
2020 |  |  | 9
2021 |  |  | 7
2022 |  |  | 4
2023 |  |  | 3
Thereafter |  |  | 6
Total |  |  | $ 39
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 | $ 10 | 9 |
Kentucky Utilities Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Non-current lease liabilities | 23 | 26 |
Kentucky Utilities Co [Member] | Other Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | $ 28 | $ 31 |

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