XML 161 R97.htm IDEA: XBRL DOCUMENT v3.25.4
Derivative Instruments and Hedging Activities (Offsetting Derivative Instruments and Credit Risk-Related Features) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade $ 5  
Derivative Net Liability Position Containing Credit Risk Related Contingency Features 5  
Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 6 $ 9
Cash collateral received eligible for offset - assets 0 0
Net assets 3 4
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset 3 5
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset 3 5
Gross liabilities 10 16
Cash collateral pledged eligible for offset - liabilities 0 0
Net liabilities 7 11
Louisville Gas And Electric Co [Member]    
Offsetting Assets And Liabilities [Line Items]    
Cash collateral received eligible for offset - assets 0 0
Cash collateral pledged eligible for offset - liabilities 0 0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]    
Offsetting Assets And Liabilities [Line Items]    
Gross assets 0 0
Cash collateral received eligible for offset - assets 0 0
Net assets 0 0
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset 0 0
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset 0 0
Gross liabilities 5 3
Cash collateral pledged eligible for offset - liabilities 0 0
Net liabilities 5 3
Kentucky Utilities Co [Member]    
Offsetting Assets And Liabilities [Line Items]    
Cash collateral received eligible for offset - assets 0 0
Cash collateral pledged eligible for offset - liabilities $ 0 $ 0