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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 464 | $ 455
Accumulated depreciation | 110 | 94
Construction work in progress | $ 0 | $ 1
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,490 | $ 1,372
Accumulated depreciation | 300 | 276
Construction work in progress | $ 49 | $ 148
Louisville Gas And Electric Co [Member] | E W Brown Units 6 And 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 38.00% | 38.00%
Electric plant | $ 53 | $ 53
Accumulated depreciation | 27 | 25
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Paddys Run Unit 13 And E W Brown Unit 5 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 53.00% | 53.00%
Electric plant | $ 52 | $ 51
Accumulated depreciation | 29 | 27
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 464 | $ 455
Accumulated depreciation | 110 | 94
Construction work in progress | $ 0 | $ 1
Louisville Gas And Electric Co [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 14.25% | 14.25%
Electric plant | $ 447 | $ 384
Accumulated depreciation | 74 | 66
Construction work in progress | $ 25 | $ 78
Louisville Gas And Electric Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 29.00% | 29.00%
Electric plant | $ 37 | $ 36
Accumulated depreciation | 17 | 16
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Trimble County Units 7 Through 10 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 37.00% | 37.00%
Electric plant | $ 82 | $ 81
Accumulated depreciation | 39 | 36
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 22.00% | 22.00%
Electric plant | $ 127 | $ 126
Accumulated depreciation | 25 | 21
Construction work in progress | $ 3 | $ 2
Louisville Gas And Electric Co [Member] | E W Brown Solar Unit [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 39.00% | 39.00%
Electric plant | $ 10 | $ 10
Accumulated depreciation | 3 | 3
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Jointly Owned Solar Share [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 44.00% | 44.00%
Electric plant | $ 3 | $ 3
Accumulated depreciation | 0 | 0
Construction work in progress | $ 0 | $ 0
Louisville Gas And Electric Co [Member] | Jointly Owned Mercer Solar |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 37.00% |
Electric plant | $ 7 |
Accumulated depreciation | 0 |
Construction work in progress | $ 0 |
Louisville Gas And Electric Co [Member] | Jointly Owned Mill Creek 5 |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 31.00% |
Electric plant | $ 0 |
Accumulated depreciation | 0 |
Construction work in progress | $ 2 |
Louisville Gas And Electric Co [Member] | Jointly Owned Brown Wind |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 36.00% |
Electric plant | $ 0 |
Accumulated depreciation | 0 |
Construction work in progress | $ 0 |
Kentucky Utilities Co [Member] | E W Brown Units 6 And 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 62.00% | 62.00%
Electric plant | $ 87 | $ 87
Accumulated depreciation | 45 | 42
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Paddys Run Unit 13 And E W Brown Unit 5 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 47.00% | 47.00%
Electric plant | $ 46 | $ 45
Accumulated depreciation | 25 | 23
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 60.75% | 60.75%
Electric plant | $ 1,043 | $ 987
Accumulated depreciation | 227 | 210
Construction work in progress | $ 24 | $ 70
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 71.00% | 71.00%
Electric plant | $ 86 | $ 84
Accumulated depreciation | 41 | 38
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Trimble County Units 7 Through 10 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 63.00% | 63.00%
Electric plant | $ 135 | $ 133
Accumulated depreciation | 65 | 61
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 78.00% | 78.00%
Electric plant | $ 449 | $ 446
Accumulated depreciation | 90 | 77
Construction work in progress | $ 10 | $ 6
Kentucky Utilities Co [Member] | E W Brown Solar Unit [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 61.00% | 61.00%
Electric plant | $ 16 | $ 16
Accumulated depreciation | 5 | 5
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Jointly Owned Solar Share [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 56.00% | 56.00%
Electric plant | $ 4 | $ 4
Accumulated depreciation | 0 | 0
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Jointly Owned Mercer Solar |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 63.00% |
Electric plant | $ 12 |
Accumulated depreciation | 0 |
Construction work in progress | $ 1 |
Kentucky Utilities Co [Member] | Jointly Owned Mill Creek 5 |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 69.00% |
Electric plant | $ 0 |
Accumulated depreciation | 0 |
Construction work in progress | $ 3 |
Kentucky Utilities Co [Member] | Jointly Owned Brown Wind |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 64.00% |
Electric plant | $ 1 |
Accumulated depreciation | 0 |
Construction work in progress | $ 0 |

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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