XML 88 R69.htm IDEA: XBRL DOCUMENT v3.21.2
Derivative Instruments and Hedging Activities - Risk Disclosures (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
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