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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net $ 0 $ 0    
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]        
Cash collateral obligation under master netting arrangements 0   $ 0  
Cash Flow Hedges [Member] | Cross Currency Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount 0      
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]        
Derivative Notional Amount Matured       $ 500
Principal amount       $ 500
Net Investment Hedges [Member] | Foreign Currency Contracts [Member]        
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]        
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI     33  
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount 64      
Louisville Gas And Electric Co [Member]        
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]        
Cash collateral obligation under master netting arrangements 0   0  
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount 64      
Kentucky Utilities Co [Member]        
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]        
Cash collateral obligation under master netting arrangements $ 0   $ 0