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Jointly Owned Facilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 427 | $ 407
Accumulated depreciation | 69 | 55
Construction work in progress | $ 1 | $ 1
Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 1,032 | $ 1,026
Accumulated depreciation | 176 | 161
Construction work in progress | $ 198 | $ 83
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 | $ 427 | $ 407
Accumulated depreciation | 69 | 55
Construction work in progress | $ 1 | $ 1
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 | $ 1,032 | $ 1,026
Accumulated depreciation | 176 | 161
Construction work in progress | $ 198 | $ 83
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 | $ 41 | $ 40
Accumulated depreciation | 17 | 15
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 | $ 55
Accumulated depreciation | 15 | 12
Construction work in progress | $ 0 | $ 1
Louisville Gas And Electric Co [Member] | Trimble County Unit 1 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 75.00% | 75.00%
Electric plant | $ 427 | $ 407
Accumulated depreciation | 69 | 55
Construction work in progress | $ 1 | $ 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 | $ 215 | $ 214
Accumulated depreciation | 36 | 32
Construction work in progress | $ 102 | $ 43
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 | $ 32 | $ 30
Accumulated depreciation | 9 | 8
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 | $ 73 | $ 71
Accumulated depreciation | 21 | 17
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 | $ 120 | $ 114
Accumulated depreciation | 8 | 5
Construction work in progress | $ 1 | $ 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 | 1 | 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 | $ 66 | $ 65
Accumulated depreciation | 27 | 23
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 | $ 50
Accumulated depreciation | 13 | 11
Construction work in progress | $ 0 | $ 1
Kentucky Utilities Co [Member] | Trimble County Unit 2 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 60.75% | 60.75%
Electric plant | $ 817 | $ 812
Accumulated depreciation | 140 | 129
Construction work in progress | $ 96 | $ 40
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 71.00% | 71.00%
Electric plant | $ 76 | $ 74
Accumulated depreciation | 20 | 19
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 | $ 120 | $ 121
Accumulated depreciation | 34 | 29
Construction work in progress | $ 0 | $ 1
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 78.00% | 78.00%
Electric plant | $ 431 | $ 412
Accumulated depreciation | 31 | 18
Construction work in progress | $ 4 | $ 4
Kentucky Utilities Co [Member] | E W Brown Solar Unit [Member] |  |
Jointly Owned Facilities [Line Items] |  |
Ownership interest | 61.00% | 61.00%
Electric plant | $ 16 | $ 15
Accumulated depreciation | 1 | 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://www.xbrl.org/2003/role/presentationRef -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=6500719&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://www.xbrl.org/2003/role/presentationRef -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=6500719&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://www.xbrl.org/2003/role/presentationRef -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=6500719&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://www.xbrl.org/2003/role/presentationRef -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=6500719&loc=d3e659983-123033 + Details
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