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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 455 | $ 457
Accumulated depreciation | 94 | 79
Construction work in progress | $ 1 | $ 0
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,372 | $ 1,360
Accumulated depreciation | 276 | 247
Construction work in progress | $ 148 | $ 121
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 | 25 | 24
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 | $ 51 | $ 51
Accumulated depreciation | 27 | 25
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 | $ 455 | $ 457
Accumulated depreciation | 94 | 79
Construction work in progress | $ 1 | $ 0
Louisville Gas And Electric Co [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 14.25% | 14.25%
Electric plant | $ 384 | $ 379
Accumulated depreciation | 66 | 57
Construction work in progress | $ 78 | $ 64
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 | $ 36 | $ 36
Accumulated depreciation | 16 | 15
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 | $ 81 | $ 81
Accumulated depreciation | 36 | 34
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 | $ 126 | $ 125
Accumulated depreciation | 21 | 19
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 | 3 | 2
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 | $ 2
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 | $ 87 | $ 88
Accumulated depreciation | 42 | 40
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 | $ 45 | $ 45
Accumulated depreciation | 23 | 22
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 | $ 987 | $ 981
Accumulated depreciation | 210 | 190
Construction work in progress | $ 70 | $ 57
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 71.00% | 71.00%
Electric plant | $ 84 | $ 84
Accumulated depreciation | 38 | 36
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 | $ 133 | $ 133
Accumulated depreciation | 61 | 57
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 | $ 446 | $ 444
Accumulated depreciation | 77 | 70
Construction work in progress | $ 6 | $ 0
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 | 4
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 | $ 3
Accumulated depreciation | 0 | 0
Construction work in progress | $ 0 | $ 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033 + Details
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