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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 |

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