Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Commodity Purchases [Line Items]
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade	$ 11
Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Price risk management liabilities	3	$ 4
Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	20	15
Asset value	2	6
Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	3	5
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	2	6
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	2	6
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	12	6
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	0	1
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	12	5
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	1
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	0	1
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	8	9
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	3	4
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	5	5
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	3	4
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	$ 3	$ 4

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- Definition

Carrying amount as of the balance sheet date of the liabilities arising from derivative contracts and hedging activities, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

+ References

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- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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