Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 455	$ 457
Accumulated depreciation	94	79
Construction work in progress	$ 1	$ 0
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,372	$ 1,360
Accumulated depreciation	276	247
Construction work in progress	$ 148	$ 121
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	$ 53	$ 53
Accumulated depreciation	25	24
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	$ 51
Accumulated depreciation	27	25
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	$ 455	$ 457
Accumulated depreciation	94	79
Construction work in progress	$ 1	$ 0
Louisville Gas And Electric Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	14.25%	14.25%
Electric plant	$ 384	$ 379
Accumulated depreciation	66	57
Construction work in progress	$ 78	$ 64
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	$ 36	$ 36
Accumulated depreciation	16	15
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	$ 81	$ 81
Accumulated depreciation	36	34
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	$ 126	$ 125
Accumulated depreciation	21	19
Construction work in progress	$ 2	$ 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	3	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	$ 3	$ 2
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	$ 87	$ 88
Accumulated depreciation	42	40
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	$ 45
Accumulated depreciation	23	22
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	$ 987	$ 981
Accumulated depreciation	210	190
Construction work in progress	$ 70	$ 57
Kentucky Utilities Co [Member] \| Trimble County Units 5 And 6 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	71.00%	71.00%
Electric plant	$ 84	$ 84
Accumulated depreciation	38	36
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	$ 133	$ 133
Accumulated depreciation	61	57
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	$ 446	$ 444
Accumulated depreciation	77	70
Construction work in progress	$ 6	$ 0
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	5	4
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	$ 4	$ 3
Accumulated depreciation	0	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://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 https://asc.fasb.org/extlink&oid=122136288&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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