Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Commodity Purchases [Line Items]
Derivative Net Liability Position Containing Credit Risk Related Contingency Feature	$ 0
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade	0
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	13	16
Asset value	10	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
Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Asset value	2	0
Other Current Assets \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	6	7
Other Current Assets \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	2	0
Other Current Assets \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	6	7
Other Current Assets \| Gas Contract \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Other Current Assets \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	0	0
Other Current Assets \| Interest Rate Swaps [Member] \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	2	0
Other Current Liabilities \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	3	10
Other Current Liabilities \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Current Liabilities \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	3	10
Other Current Liabilities \| Gas Contract \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Current Liabilities \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Current Liabilities \| Interest Rate Swaps [Member] \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Noncurrent Assets [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Asset value	4	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] \| Designated As Hedging Instruments [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	4	2
Other Noncurrent Assets [Member] \| Gas Contract \| 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]
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 Assets [Member] \| Interest Rate Swaps [Member] \| Designated As Hedging Instruments [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 \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Noncurrent Liabilities \| Gas Contract \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	5	3
Other Noncurrent Liabilities \| Gas Contract \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	0	0
Other Noncurrent Liabilities \| Interest Rate Swaps [Member] \| Not Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	5	3
Other Noncurrent Liabilities \| Interest Rate Swaps [Member] \| Designated As Hedging Instruments [Member]
Commodity Purchases [Line Items]
Liability value	$ 0	$ 0

commodity purchases [Line Items]

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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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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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