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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Interest Rate Contract [Member]      
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]      
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net $ 0 $ 0 $ 0
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 20    
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 64    
Rhode Island Energy | Economic Hedges [Member] | Gas Contract      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 48    
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount $ 64