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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
GBP (£)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]      
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 Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 702    
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 1,300   £ 859
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 32 $ 31  
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 147    
LG And E And KU Energy LLC [Member] | LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]      
Interest Rate Risk And Foreign Currency Risk [Line Items]      
Derivative, Notional Amount 147    
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 $ 147