Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Credit carryforwards
Deferred tax asset tax credit carryforwards	$ 67	$ 68
Deferred Tax Assets, Valuation Allowances	245	213
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	245	213
SEC Schedule 12-09, Valuation Allowance, Deduction, Tax Rate Change		213
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward	22	36
Deferred Tax Assets, Valuation Allowance, Increase due to Loss on Extinguishment of Debt			$ 31
Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	51
Credit Carryforward Valuation Allowance Investment Tax Credit	0
Recycling Tax Credit [Member] | State [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	10
Credit Carryforward Valuation Allowance Other	0
Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	5
Credit Carryforward Valuation Allowance Other	0
Other [Member] | State [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	1
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	213	462	536
Additions charged to income	54	10	48
Additions charged to other accounts	0	0	0
Deductions	22	259	122
Balance at end of period	245	213	462
SEC Schedule 12-09, Valuation Allowance, Deduction, Business Disposition			$ 113
Louisville Gas And Electric Co [Member]
Credit carryforwards
State tax credit carryforwards	8	9
Deferred Tax Assets, Valuation Allowances	8	9
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	8	9
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	8
Deferred Tax Assets, Valuation Allowances	8
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	8
Kentucky Utilities Co [Member]
Credit carryforwards
State tax credit carryforwards	4	4
Deferred Tax Assets, Valuation Allowances	2	3
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	2	$ 3
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