Derivative Instruments and Hedging Activities (Intro) (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
---|---|---|
Master Netting Arrangements (Numeric) [Line Items] | ||
Cash Collateral Obligation Under Master Netting Arrangement | $ 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 Arrangement | 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 Arrangement | 0 | 0 |
Cash Collateral Posted Under Master Netting Arrangements | $ 0 | $ 0 |