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

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

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

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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.

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- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

+ References

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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