Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets [Abstract]
Cash collateral received - eligible for offset	$ 2	$ 0
Liabilities [Abstract]
Cash collateral pledged - eligible for offset		0
Treasury Derivatives [Member]
Assets [Abstract]
Gross	76	0
Derivative instruments - eligible for offset	3	0
Cash collateral received - eligible for offset	2	0
Net	71	0
Liabilities [Abstract]
Gross	12	18
Derivative instruments - eligible for offset	3	0
Cash collateral pledged - eligible for offset	0	0
Net	9	18
Louisville Gas And Electric Co [Member]
Assets [Abstract]
Cash collateral received - eligible for offset	0	0
Liabilities [Abstract]
Cash collateral pledged - eligible for offset	0	0
Louisville Gas And Electric Co [Member] \| Treasury Derivatives [Member]
Assets [Abstract]
Gross	0	0
Derivative instruments - eligible for offset	0	0
Cash collateral received - eligible for offset	0	0
Net	0	0
Liabilities [Abstract]
Gross	7	18
Derivative instruments - eligible for offset	0	0
Cash collateral pledged - eligible for offset	0	0
Net	$ 7	$ 18

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative asset.

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