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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 440 | $ 440
Accumulated depreciation | 64 | 54
Construction work in progress | $ 2 | $ 2
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,340 | $ 1,278
Accumulated depreciation | 227 | 203
Construction work in progress | $ 106 | $ 134
LG And E And KU Energy LLC [Member] | Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 440 | $ 440
Accumulated depreciation | 64 | 54
Construction work in progress | $ 2 | $ 2
LG And E And KU Energy LLC [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,340 | $ 1,278
Accumulated depreciation | 227 | 203
Construction work in progress | $ 106 | $ 134
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 | $ 46 | $ 45
Accumulated depreciation | 22 | 20
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 | $ 52
Accumulated depreciation | 22 | 20
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 | $ 440 | $ 440
Accumulated depreciation | 64 | 54
Construction work in progress | $ 2 | $ 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 | $ 370 | $ 340
Accumulated depreciation | 51 | 43
Construction work in progress | $ 54 | $ 69
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 | $ 33 | $ 32
Accumulated depreciation | 14 | 12
Construction work in progress | $ 1 | $ 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 | $ 77 | $ 78
Accumulated depreciation | 31 | 27
Construction work in progress | $ 1 | $ 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 | $ 123 | $ 119
Accumulated depreciation | 15 | 13
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 | $ 1
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 | $ 76 | $ 75
Accumulated depreciation | 37 | 32
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 | $ 46
Accumulated depreciation | 20 | 14
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 | $ 970 | $ 938
Accumulated depreciation | 176 | 160
Construction work in progress | $ 52 | $ 65
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 71.00% | 71.00%
Electric plant | $ 77 | $ 76
Accumulated depreciation | 33 | 29
Construction work in progress | $ 4 | $ 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 | $ 129 | $ 128
Accumulated depreciation | 53 | 46
Construction work in progress | $ 2 | $ 0
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 78.00% | 78.00%
Electric plant | $ 443 | $ 429
Accumulated depreciation | 57 | 49
Construction work in progress | $ 2 | $ 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 | 3 | 2
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 | $ 2 | $ 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=115995737&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=115995737&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=115995737&loc=d3e659983-123033 + Details
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