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Leases - Lessee (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Lease, Cost [Abstract] |  |  |
Operating lease cost | $ 24 | $ 28 | $ 30
Short-term lease cost | 6 | 7 | 5
Total lease cost | 30 | 35 | 35
Operating cash flows from operating leases | 23 | 24 | 26
Right-of-use asset obtained in exchange for new operating lease liabilities | 12 | 17 | 45
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 23 |  |
2023 | 20 |  |
2024 | 15 |  |
2025 | 8 |  |
2026 | 3 |  |
Thereafter | 5 |  |
Total | $ 74 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.38% |  |
Weighted-average remaining lease term (in years) | 4 years |  |
Current lease liabilities | $ 22 |  |
Non-current lease liabilities | $ 47 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other deferred credits and noncurrent liabilities |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities |  |
Other Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | $ 62 |  |
Louisville Gas And Electric Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | 6 | 8 | 12
Short-term lease cost | 1 | 1 | 1
Total lease cost | 7 | 9 | 13
Operating cash flows from operating leases | 6 | 7 | 9
Right-of-use asset obtained in exchange for new operating lease liabilities | 4 | 6 | 5
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 6 |  |
2023 | 5 |  |
2024 | 4 |  |
2025 | 3 |  |
2026 | 1 |  |
Thereafter | 1 |  |
Total | $ 20 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.48% |  |
Weighted-average remaining lease term (in years) | 4 years |  |
Current lease liabilities | $ 6 |  |
Non-current lease liabilities | $ 12 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other deferred credits and noncurrent liabilities |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities |  |
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 Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | $ 15 |  |
Kentucky Utilities Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | 10 | 13 | 13
Short-term lease cost | 1 | 1 | 1
Total lease cost | 11 | 14 | 14
Operating cash flows from operating leases | 10 | 11 | 11
Right-of-use asset obtained in exchange for new operating lease liabilities | 7 | $ 9 | $ 11
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 10 |  |
2023 | 8 |  |
2024 | 6 |  |
2025 | 4 |  |
2026 | 1 |  |
Thereafter | 1 |  |
Total | $ 30 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 3.67% |  |
Weighted-average remaining lease term (in years) | 4 years |  |
Current lease liabilities | $ 9 |  |
Non-current lease liabilities | $ 17 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other deferred credits and noncurrent liabilities |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities |  |
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 Noncurrent Assets [Member] |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Right-of-use assets | $ 24 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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