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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Credit carryforwards      
Deferred tax asset tax credit carryforwards $ 35 $ 24  
Deferred Tax Assets, Valuation Allowances 184 224  
Valuation Allowances and Reserves (Details) [Roll Forward]      
Deferred Tax Assets, Valuation Allowances 184 224  
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward 41 23 $ 22
Investment Tax Credit [Member] | Federal [Member]      
Credit carryforwards      
Deferred tax asset tax credit carryforwards 26    
Credit Carryforward Valuation Allowance Investment Tax Credit 0    
Recycling Tax Credit [Member] | State [Member]      
Credit carryforwards      
Deferred tax asset tax credit carryforwards 6    
Credit Carryforward Valuation Allowance Other 0    
Other [Member] | Federal [Member]      
Credit carryforwards      
Deferred tax asset tax credit carryforwards 2    
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 224 245 213
Additions charged to income 4 3 54
Additions charged to other accounts 0 1 0
Deductions 44 25 22
Balance at end of period 184 224 $ 245
Louisville Gas And Electric Co [Member]      
Credit carryforwards      
State tax credit carryforwards 5 6  
Deferred Tax Assets, Valuation Allowances 5 6  
Valuation Allowances and Reserves (Details) [Roll Forward]      
Deferred Tax Assets, Valuation Allowances 5 6  
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member]      
Credit carryforwards      
State tax credit carryforwards 5    
Deferred Tax Assets, Valuation Allowances 5    
Valuation Allowances and Reserves (Details) [Roll Forward]      
Deferred Tax Assets, Valuation Allowances 5    
Kentucky Utilities Co [Member]      
Credit carryforwards      
State tax credit carryforwards 3 4  
Deferred Tax Assets, Valuation Allowances 1 2  
Valuation Allowances and Reserves (Details) [Roll Forward]      
Deferred Tax Assets, Valuation Allowances 1 $ 2  
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member]      
Credit carryforwards      
State tax credit carryforwards 3    
Deferred Tax Assets, Valuation Allowances 1    
Valuation Allowances and Reserves (Details) [Roll Forward]      
Deferred Tax Assets, Valuation Allowances 1    
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member]      
Credit carryforwards      
State tax credit carryforwards 1    
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member]      
Credit carryforwards      
State tax credit carryforwards $ 2