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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 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 collateral pledged - eligible for offset | 0 |  | 0
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
Cash collateral pledged - eligible for offset | 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
Cash collateral pledged - eligible for offset | $ 0 |  | $ 0

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- Definition The amount of net gain (loss) reclassified into earnings when interest rate cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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