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Derivative Instruments and Hedging Activities - Intro (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash collateral obligation under master netting arrangements | $ 0 | $ 0
Cash collateral posted under master netting arrangements | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash collateral obligation under master netting arrangements | 0 | 0
Cash collateral posted under master netting arrangements | 0 | 0
Kentucky Utilities Co [Member] |  |
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash collateral obligation under master netting arrangements | 0 | 0
Cash collateral posted under master netting arrangements | $ 0 | $ 0

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