Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 457	$ 440
Accumulated depreciation	79	64
Construction work in progress	$ 0	$ 2
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,360	$ 1,340
Accumulated depreciation	247	227
Construction work in progress	$ 121	$ 106
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	$ 46
Accumulated depreciation	24	22
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	25	22
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	$ 457	$ 440
Accumulated depreciation	79	64
Construction work in progress	$ 0	$ 2
Louisville Gas And Electric Co [Member] \| Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	14.25%	14.25%
Electric plant	$ 379	$ 370
Accumulated depreciation	57	51
Construction work in progress	$ 64	$ 54
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	$ 33
Accumulated depreciation	15	14
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	$ 81	$ 77
Accumulated depreciation	34	31
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	$ 125	$ 123
Accumulated depreciation	19	15
Construction work in progress	$ 0	$ 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	2	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	$ 2	$ 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	$ 88	$ 76
Accumulated depreciation	40	37
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	22	20
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	$ 981	$ 970
Accumulated depreciation	190	176
Construction work in progress	$ 57	$ 52
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	$ 77
Accumulated depreciation	36	33
Construction work in progress	$ 0	$ 4
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	$ 129
Accumulated depreciation	57	53
Construction work in progress	$ 0	$ 2
Kentucky Utilities Co [Member] \| Cane Run Unit 7 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	78.00%	78.00%
Electric plant	$ 444	$ 443
Accumulated depreciation	70	57
Construction work in progress	$ 0	$ 2
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	4	3
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	$ 3	$ 2
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 http://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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