Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 399	$ 309
Accumulated depreciation	44	51
Construction work in progress	$ 6	$ 59
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,013	$ 1,002
Accumulated depreciation	141	122
Construction work in progress	$ 27	$ 32
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	$ 399	$ 309
Accumulated depreciation	44	51
Construction work in progress	$ 6	$ 59
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	$ 1,013	$ 1,002
Accumulated depreciation	141	122
Construction work in progress	$ 27	$ 32
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	$ 40	$ 40
Accumulated depreciation	12	10
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	$ 47	$ 47
Accumulated depreciation	10	7
Construction work in progress	$ 1	$ 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	$ 399	$ 309
Accumulated depreciation	44	51
Construction work in progress	$ 6	$ 59
Louisville Gas And Electric Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	14.25%	14.25%
Electric plant	$ 210	$ 205
Accumulated depreciation	28	23
Construction work in progress	$ 12	$ 15
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	$ 29	$ 29
Accumulated depreciation	6	5
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	$ 71	$ 70
Accumulated depreciation	14	11
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	$ 115	$ 0
Accumulated depreciation	1	0
Construction work in progress	$ 1	$ 113
Louisville Gas And Electric Co [Member] \| E W Brown Solar Unit [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	39.00%
Electric plant	$ 0
Accumulated depreciation	0
Construction work in progress	$ 4
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	$ 65	$ 65
Accumulated depreciation	19	15
Construction work in progress	$ 0	$ 1
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	$ 43	$ 42
Accumulated depreciation	9	6
Construction work in progress	$ 1	$ 0
Kentucky Utilities Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	60.75%	60.75%
Electric plant	$ 803	$ 797
Accumulated depreciation	113	98
Construction work in progress	$ 15	$ 17
Kentucky Utilities Co [Member] \| Trimble County Units 5 And 6 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	71.00%	71.00%
Electric plant	$ 70	$ 70
Accumulated depreciation	15	11
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	$ 121	$ 120
Accumulated depreciation	23	18
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	$ 411	$ 0
Accumulated depreciation	6	0
Construction work in progress	$ 5	$ 403
Kentucky Utilities Co [Member] \| E W Brown Solar Unit [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	61.00%
Electric plant	$ 0
Accumulated depreciation	0
Construction work in progress	$ 6

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C

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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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