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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 457 | $ 440
Accumulated depreciation | 79 | 64
Construction work in progress | $ 0 | $ 2
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,360 | $ 1,340
Accumulated depreciation | 247 | 227
Construction work in progress | $ 121 | $ 106
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 | $ 46
Accumulated depreciation | 24 | 22
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 | 25 | 22
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 | $ 457 | $ 440
Accumulated depreciation | 79 | 64
Construction work in progress | $ 0 | $ 2
Louisville Gas And Electric Co [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 14.25% | 14.25%
Electric plant | $ 379 | $ 370
Accumulated depreciation | 57 | 51
Construction work in progress | $ 64 | $ 54
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 | $ 33
Accumulated depreciation | 15 | 14
Construction work in progress | $ 0 | $ 1
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 | $ 77
Accumulated depreciation | 34 | 31
Construction work in progress | $ 0 | $ 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 | $ 125 | $ 123
Accumulated depreciation | 19 | 15
Construction work in progress | $ 0 | $ 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 | 2 | 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 | $ 2 | $ 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 | $ 88 | $ 76
Accumulated depreciation | 40 | 37
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 | 22 | 20
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 | $ 981 | $ 970
Accumulated depreciation | 190 | 176
Construction work in progress | $ 57 | $ 52
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 | $ 77
Accumulated depreciation | 36 | 33
Construction work in progress | $ 0 | $ 4
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 | $ 129
Accumulated depreciation | 57 | 53
Construction work in progress | $ 0 | $ 2
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 78.00% | 78.00%
Electric plant | $ 444 | $ 443
Accumulated depreciation | 70 | 57
Construction work in progress | $ 0 | $ 2
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 | 4 | 3
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 | $ 3 | $ 2
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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033 + Details
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