Jointly Owned Facilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Trimble County Unit 1 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 462	$ 464
Accumulated depreciation	124	110
Construction work in progress	$ 1	$ 0
Trimble County Unit 2 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	75.00%	75.00%
Electric plant	$ 1,549	$ 1,490
Accumulated depreciation	323	300
Construction work in progress	$ 10	$ 49
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	29	27
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	30	29
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	$ 462	$ 464
Accumulated depreciation	124	110
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	$ 472	$ 447
Accumulated depreciation	79	74
Construction work in progress	$ 5	$ 25
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	19	17
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	41	39
Construction work in progress	$ 1	$ 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	$ 137	$ 127
Accumulated depreciation	27	25
Construction work in progress	$ 0	$ 3
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	3
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	0	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	$ 10	$ 7
Accumulated depreciation	0	0
Construction work in progress	$ 1	$ 0
Louisville Gas And Electric Co [Member] | Jointly Owned Mill Creek 5
Jointly Owned Facilities [Line Items]
Ownership interest	31.00%	31.00%
Electric plant	$ 0	$ 0
Accumulated depreciation	0	0
Construction work in progress	$ 74	$ 2
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	$ 87	$ 87
Accumulated depreciation	48	45
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	26	25
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	$ 1,077	$ 1,043
Accumulated depreciation	224	227
Construction work in progress	$ 5	$ 24
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	$ 86
Accumulated depreciation	44	41
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	$ 135
Accumulated depreciation	69	65
Construction work in progress	$ 1	$ 0
Kentucky Utilities Co [Member] | Cane Run Unit 7 [Member]
Jointly Owned Facilities [Line Items]
Ownership interest	78.00%	78.00%
Electric plant	$ 485	$ 449
Accumulated depreciation	95	90
Construction work in progress	$ 1	$ 10
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	6	5
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	0
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	$ 16	$ 12
Accumulated depreciation	0	0
Construction work in progress	$ 2	$ 1
Kentucky Utilities Co [Member] | Jointly Owned Mill Creek 5
Jointly Owned Facilities [Line Items]
Ownership interest	69.00%	69.00%
Electric plant	$ 0	$ 0
Accumulated depreciation	0	0
Construction work in progress	$ 164	$ 3
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