Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Credit carryforwards
Deferred tax asset tax credit carryforwards	$ 68	$ 15
Deferred Tax Assets, Valuation Allowances	213	462
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	213	462
SEC Schedule 12-09, Valuation Allowance, Deduction, Tax Rate Change	213
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward	36
Deferred Tax Assets, Valuation Allowance, Increase due to Loss on Extinguishment of Debt	31	31
Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	20
Credit Carryforward Valuation Allowance Investment Tax Credit	0
Foreign Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	32
Credit Carryforward Valuation Allowance Foreign Tax Credits	0
Recycling Tax Credit [Member] | State [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	12
Credit Carryforward Valuation Allowance Other	0
Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset tax credit carryforwards	3
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	462	536	$ 514
Additions charged to income	10	48	26
Additions charged to other accounts	0	0	0
Deductions	259	122	4
Balance at end of period	213	462	$ 536
SEC Schedule 12-09, Valuation Allowance, Deduction, Business Disposition		113
Louisville Gas And Electric Co [Member]
Credit carryforwards
State tax credit carryforwards	9	11
Deferred Tax Assets, Valuation Allowances	9	11
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	9	11
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	9
Deferred Tax Assets, Valuation Allowances	9
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	9
Kentucky Utilities Co [Member]
Credit carryforwards
State tax credit carryforwards	4	4
Deferred Tax Assets, Valuation Allowances	3	3
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	3	$ 3
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	4
Deferred Tax Assets, Valuation Allowances	3
Valuation Allowances and Reserves (Details) [Roll Forward]
Deferred Tax Assets, Valuation Allowances	3
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member]
Credit carryforwards
State tax credit carryforwards	3
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member]
Credit carryforwards
State tax credit carryforwards	$ 1