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Derivative Instruments and Hedging Activities - Risk Disclosures (Details)
£ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
GBP (£)
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    
Cash Flow Hedges [Member] | Cross Currency Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount 202      
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   $ 33  
Economic Hedges [Member] | Foreign Currency Contracts [Member]        
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]        
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity | £       £ 7,500
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount 64      
LG And E And KU Energy LLC [Member] | 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] | Economic Hedges [Member] | Interest Rate Swaps [Member]        
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]        
Derivative, Notional Amount $ 64