Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Credit carryforwards
Deferred tax asset tax credit carryforwards	$ 24	$ 67
Deferred Tax Assets, Valuation Allowances	224	245
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	224	245
SEC Schedule 12-09, Valuation Allowance, Deduction, Tax Rate Change			$ 213
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward	23	22	36
Recycling Tax Credit [Member] | State [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	8
Credit Carryforward Valuation Allowance Other	0
Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	14
Credit Carryforward Valuation Allowance Other	0
Other [Member] | State [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	2
Credit Carryforward Valuation Allowance Other	0
Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	245	213	462
Additions charged to income	3	54	10
Additions charged to other accounts	1	0	0
Deductions	25	22	259
Balance at end of period	224	245	$ 213
Louisville Gas And Electric Co [Member]
Credit carryforwards
State tax credit carryforwards	6	8
Deferred Tax Assets, Valuation Allowances	6	8
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	6	8
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	6
Deferred Tax Assets, Valuation Allowances	6
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	6
Kentucky Utilities Co [Member]
Credit carryforwards
State tax credit carryforwards	4	4
Deferred Tax Assets, Valuation Allowances	2	2
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	2	$ 2
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	4
Deferred Tax Assets, Valuation Allowances	2
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	2
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member]
Credit carryforwards
State tax credit carryforwards	2
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member]
Credit carryforwards
State tax credit carryforwards	$ 2