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Derivative Instruments and Hedging Activities (Fair Values) (Details) - Derivatives Not Designated As Hedging Instruments [Member] - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Values by Balance Sheet Location [Abstract]    
Asset value $ 6 $ 9
Liability value 15 16
Current Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 6 7
Current Assets [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Current Assets [Member] | Gas Contract    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 6 7
Noncurrent Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 2
Noncurrent Assets [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Noncurrent Assets [Member] | Gas Contract    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 2
Current Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 6 10
Current Liabilities [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 1 0
Current Liabilities [Member] | Gas Contract    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 5 10
Noncurrent Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 9 6
Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 4 3
Noncurrent Liabilities [Member] | Gas Contract    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 5 3
Louisville Gas And Electric Co [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Liability value 5 3
Louisville Gas And Electric Co [Member] | Current Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Louisville Gas And Electric Co [Member] | Current Assets [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Louisville Gas And Electric Co [Member] | Noncurrent Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Louisville Gas And Electric Co [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 0 0
Louisville Gas And Electric Co [Member] | Current Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 1 0
Louisville Gas And Electric Co [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 1 0
Louisville Gas And Electric Co [Member] | Noncurrent Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 4 3
Louisville Gas And Electric Co [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value $ 4 $ 3