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Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 464	$ 462
Accumulated depreciation	141	124
Construction work in progress	$ 20	$ 1
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,543	$ 1,549
Accumulated depreciation	344	323
Construction work in progress	$ 20	$ 10
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	31	29
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	$ 52
Accumulated depreciation	32	30
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	$ 464	$ 462
Accumulated depreciation	141	124
Construction work in progress	$ 20	$ 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	$ 474	$ 472
Accumulated depreciation	88	79
Construction work in progress	$ 9	$ 5
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	$ 37	$ 37
Accumulated depreciation	20	19
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	$ 82	$ 82
Accumulated depreciation	44	41
Construction work in progress	$ 2	$ 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	$ 137	$ 137
Accumulated depreciation	31	27
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	4	4
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	$ 3
Accumulated depreciation	1	0
Construction work in progress	$ 0	$ 0
Louisville Gas And Electric Co [Member] | Jointly Owned Mercer Solar
Jointly Owned Facilities [Line Items]
Ownership interest	37.00%	37.00%
Electric plant	$ 7	$ 10
Accumulated depreciation	0	0
Construction work in progress	$ 14	$ 1
Louisville Gas And Electric Co [Member] | Jointly Owned Mill Creek 5
Jointly Owned Facilities [Line Items]
Ownership interest	31.00%	31.00%
Electric plant	$ 1	$ 0
Accumulated depreciation	0	0
Construction work in progress	$ 219	$ 74
Louisville Gas And Electric Co [Member] | Jointly Owned Brown Wind
Jointly Owned Facilities [Line Items]
Ownership interest	36.00%	36.00%
Electric plant	$ 0	$ 0
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	$ 87
Accumulated depreciation	51	48
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	$ 47	$ 46
Accumulated depreciation	28	26
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	$ 1,069	$ 1,077
Accumulated depreciation	256	224
Construction work in progress	$ 12	$ 5
Kentucky Utilities Co [Member] | Trimble County Units 5 And 6 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	71.00%	71.00%
Electric plant	$ 87	$ 87
Accumulated depreciation	47	44
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	$ 136	$ 136
Accumulated depreciation	74	69
Construction work in progress	$ 3	$ 1
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	78.00%	78.00%
Electric plant	$ 486	$ 485
Accumulated depreciation	109	95
Construction work in progress	$ 6	$ 1
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	7	6
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	$ 4
Accumulated depreciation	1	1
Construction work in progress	$ 0	$ 0
Kentucky Utilities Co [Member] | Jointly Owned Mercer Solar
Jointly Owned Facilities [Line Items]
Ownership interest	63.00%	63.00%
Electric plant	$ 13	$ 16
Accumulated depreciation	0	0
Construction work in progress	$ 23	$ 2
Kentucky Utilities Co [Member] | Jointly Owned Mill Creek 5
Jointly Owned Facilities [Line Items]
Ownership interest	69.00%	69.00%
Electric plant	$ 1	$ 0
Accumulated depreciation	0	0
Construction work in progress	$ 486	$ 164
Kentucky Utilities Co [Member] | Jointly Owned Brown Wind
Jointly Owned Facilities [Line Items]
Ownership interest	64.00%	64.00%
Electric plant	$ 1	$ 1
Accumulated depreciation	0	0
Construction work in progress	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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X

- Definition

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+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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