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Leases - Lessee (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lease, Cost [Abstract] |  |  |
Operating lease cost | $ 26 | $ 20 | $ 24
Short-term lease cost | 6 | 6 | 6
Total lease cost | 33 | 26 | 30
Operating cash flows from operating leases | 25 | 26 | 23
Right-of-use asset obtained in exchange for new operating lease liabilities | 47 | 15 | 12
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 24 |  |
2023 | 18 |  |
2024 | 11 |  |
2025 | 9 |  |
2026 | 8 |  |
Thereafter | 34 |  |
Total | $ 104 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 4.68% |  |
Weighted-average remaining lease term (in years) | 8 years |  |
Current lease liabilities | $ 21 |  |
Non-current lease liabilities | 63 |  |
Right-of-use assets | $ 74 |  |
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 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets |  |
Finance Lease, Right-of-Use Asset, Amortization | $ 1 | 0 | 0
Finance Lease, Interest Expense | 0 | 0 | 0
Finance Lease, Interest Payment on Liability | 0 | 0 | 0
Finance Lease, Principal Payments | 1 | 0 | 0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 7 | 0 | 0
Finance Lease, Liability, to be Paid, Year One | 2 |  |
Finance Lease, Liability, to be Paid, Year Two | 1 |  |
Finance Lease, Liability, to be Paid, Year Three | 1 |  |
Finance Lease, Liability, to be Paid, Year Four | 1 |  |
Finance Lease, Liability, to be Paid, Year Five | 1 |  |
Finance Lease, Liability, to be Paid, after Year Five | 2 |  |
Finance Lease, Liability, to be Paid | $ 8 |  |
Finance Lease, Weighted Average Discount Rate, Percent | 7.56% |  |
Finance Lease, Weighted Average Remaining Lease Term | 7 years |  |
Finance Lease, Liability, Current | $ 1 |  |
Finance Lease, Liability, Noncurrent | 6 |  |
Finance Lease, Right-of-Use Asset, before Accumulated Amortization | $ 6 |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Regulated utility plant |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other deferred credits and noncurrent liabilities |  |
Louisville Gas And Electric Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | $ 5 | 6 | 6
Short-term lease cost | 1 | 1 | 1
Total lease cost | 6 | 7 | 7
Operating cash flows from operating leases | 6 | 8 | 6
Right-of-use asset obtained in exchange for new operating lease liabilities | 6 | 4 | 4
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 6 |  |
2023 | 5 |  |
2024 | 2 |  |
2025 | 1 |  |
2026 | 1 |  |
Thereafter | 0 |  |
Total | $ 15 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 4.05% |  |
Weighted-average remaining lease term (in years) | 3 years |  |
Current lease liabilities | $ 6 |  |
Non-current lease liabilities | 9 |  |
Right-of-use assets | $ 13 |  |
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 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets |  |
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 |  |
Kentucky Utilities Co [Member] |  |  |
Lease, Cost [Abstract] |  |  |
Operating lease cost | $ 10 | 9 | 10
Short-term lease cost | 1 | 2 | 1
Total lease cost | 11 | 11 | 11
Operating cash flows from operating leases | 9 | 12 | 10
Right-of-use asset obtained in exchange for new operating lease liabilities | 10 | $ 5 | $ 7
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2022 | 9 |  |
2023 | 6 |  |
2024 | 3 |  |
2025 | 2 |  |
2026 | 1 |  |
Thereafter | 1 |  |
Total | $ 22 |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
Weighted-average discount rate | 4.36% |  |
Weighted-average remaining lease term (in years) | 3 years |  |
Current lease liabilities | $ 8 |  |
Non-current lease liabilities | 12 |  |
Right-of-use assets | $ 19 |  |
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 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets |  |
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 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payment for finance 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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes current operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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