Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Commodity Purchases [Line Items]
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade	$ 3
Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Price risk management liabilities	5	$ 3
Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	16	16
Asset value	4	9
Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Liability value	5	3
Asset value	0	0
Other Current Assets \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	3	7
Other Current Assets \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	3	7
Other Current Liabilities \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	6	10
Other Current Liabilities \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	6	10
Other Noncurrent Assets [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	1	2
Other Noncurrent Assets [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Other Noncurrent Assets [Member] \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	1	2
Other Noncurrent Assets [Member] \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Other Noncurrent Assets [Member] \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member] \| Louisville Gas And Electric Co [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Other Noncurrent Liabilities \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	10	6
Other Noncurrent Liabilities \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	5	3
Other Noncurrent Liabilities \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	$ 5	$ 3

commodity purchases [Line Items]

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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

No definition available.

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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.

+ References

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