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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 464 | $ 462
Accumulated depreciation | 141 | 124
Construction work in progress | $ 20 | $ 1
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,543 | $ 1,549
Accumulated depreciation | 344 | 323
Construction work in progress | $ 20 | $ 10
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 | 31 | 29
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 | $ 52
Accumulated depreciation | 32 | 30
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 | $ 462
Accumulated depreciation | 141 | 124
Construction work in progress | $ 20 | $ 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 | $ 474 | $ 472
Accumulated depreciation | 88 | 79
Construction work in progress | $ 9 | $ 5
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 | $ 37
Accumulated depreciation | 20 | 19
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 | $ 82
Accumulated depreciation | 44 | 41
Construction work in progress | $ 2 | $ 1
Louisville Gas And Electric Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 22.00% | 22.00%
Electric plant | $ 137 | $ 137
Accumulated depreciation | 31 | 27
Construction work in progress | $ 2 | $ 0
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 | 4 | 4
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 | 1 | 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% | 37.00%
Electric plant | $ 7 | $ 10
Accumulated depreciation | 0 | 0
Construction work in progress | $ 14 | $ 1
Louisville Gas And Electric Co [Member] | Jointly Owned Mill Creek 5 |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 31.00% | 31.00%
Electric plant | $ 1 | $ 0
Accumulated depreciation | 0 | 0
Construction work in progress | $ 219 | $ 74
Louisville Gas And Electric Co [Member] | Jointly Owned Brown Wind |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 36.00% | 36.00%
Electric plant | $ 0 | $ 0
Accumulated depreciation | 0 | 0
Construction work in progress | $ 0 | $ 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 | $ 88 | $ 87
Accumulated depreciation | 51 | 48
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 | $ 47 | $ 46
Accumulated depreciation | 28 | 26
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 | $ 1,069 | $ 1,077
Accumulated depreciation | 256 | 224
Construction work in progress | $ 12 | $ 5
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 71.00% | 71.00%
Electric plant | $ 87 | $ 87
Accumulated depreciation | 47 | 44
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 | $ 136 | $ 136
Accumulated depreciation | 74 | 69
Construction work in progress | $ 3 | $ 1
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 78.00% | 78.00%
Electric plant | $ 486 | $ 485
Accumulated depreciation | 109 | 95
Construction work in progress | $ 6 | $ 1
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 | 7 | 6
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 | 1 | 1
Construction work in progress | $ 0 | $ 0
Kentucky Utilities Co [Member] | Jointly Owned Mercer Solar |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 63.00% | 63.00%
Electric plant | $ 13 | $ 16
Accumulated depreciation | 0 | 0
Construction work in progress | $ 23 | $ 2
Kentucky Utilities Co [Member] | Jointly Owned Mill Creek 5 |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 69.00% | 69.00%
Electric plant | $ 1 | $ 0
Accumulated depreciation | 0 | 0
Construction work in progress | $ 486 | $ 164
Kentucky Utilities Co [Member] | Jointly Owned Brown Wind |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 64.00% | 64.00%
Electric plant | $ 1 | $ 1
Accumulated depreciation | 0 | 0
Construction work in progress | $ 0 | $ 0

X
- 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/1943274/2147479070/980-360-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/1943274/2147479070/980-360-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/1943274/2147479070/980-360-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/1943274/2147479070/980-360-S99-1 + Details
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