Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 427	$ 427
Accumulated depreciation	77	69
Construction work in progress	$ 0	$ 1
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,063	$ 1,032
Accumulated depreciation	199	176
Construction work in progress	$ 293	$ 198
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	$ 427
Accumulated depreciation	77	69
Construction work in progress	$ 0	$ 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	$ 1,063	$ 1,032
Accumulated depreciation	199	176
Construction work in progress	$ 293	$ 198
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	$ 41
Accumulated depreciation	20	17
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	17	15
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	$ 427	$ 427
Accumulated depreciation	77	69
Construction work in progress	$ 0	$ 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	$ 226	$ 215
Accumulated depreciation	39	36
Construction work in progress	$ 152	$ 102
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	$ 32
Accumulated depreciation	11	9
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	$ 77	$ 73
Accumulated depreciation	24	21
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	$ 119	$ 120
Accumulated depreciation	9	8
Construction work in progress	$ 0	$ 1
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	1
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	$ 66
Accumulated depreciation	31	27
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	$ 46
Accumulated depreciation	15	13
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	$ 837	$ 817
Accumulated depreciation	160	140
Construction work in progress	$ 141	$ 96
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	$ 76
Accumulated depreciation	25	20
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	$ 129	$ 120
Accumulated depreciation	41	34
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	$ 428	$ 431
Accumulated depreciation	36	31
Construction work in progress	$ 0	$ 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	$ 16
Accumulated depreciation	2	1
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://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

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- Definition

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

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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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