Derivative Instruments and Hedging Activities - Intro (Details) - USD ($) $ in Millions |
Sep. 30, 2022 |
Dec. 31, 2021 |
---|---|---|
Master Netting Arrangements (Numeric) [Line Items] | ||
Cash collateral obligation under master netting arrangements | $ 2 | $ 0 |
Cash collateral posted under master netting arrangements | 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 |