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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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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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Nominal volume used to calculate payments on a derivative instrument.

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Nominal or face amount used to calculate payment on derivative.

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) $ in Millions	3 Months Ended
	Jun. 30, 2026 USD ($) Bcf	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Cash collateral obligation under master netting arrangements	$ 0		$ 0
Cash collateral pledged - eligible for offset	0		0
Cash collateral pledged - eligible for offset	0		0
Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	2		6
Liability value	20		15
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	2		6
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	12		6
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	8		9
Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	0		1
Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	3		4
Interest Rate Contract
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	$ 0
Gas Contract \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	2		6
Gas Contract \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Gas Contract \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	12		5
Gas Contract \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	5		5
Cash Flow Hedges [Member] \| Interest Rate Contract
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	0
LGE [Member] \| Economic Hedges [Member] \| Interest Rate Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	$ 64
Rhode Island Energy \| Economic Hedges [Member] \| Gas Contract
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Derivative, Nonmonetary Notional Amount, Volume \| Bcf	45
Louisville Gas And Electric Co [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Cash collateral obligation under master netting arrangements	$ 0		0
Cash collateral pledged - eligible for offset	0		0
Cash collateral pledged - eligible for offset	0		0
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Liability value	3		5
Louisville Gas And Electric Co [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	0		1
Louisville Gas And Electric Co [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	3		4
Louisville Gas And Electric Co [Member] \| Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] \| Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] \| Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	0		1
Louisville Gas And Electric Co [Member] \| Interest Rate Swaps [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Not Designated As Hedging Instruments [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Liability value	3		4
Louisville Gas And Electric Co [Member] \| Economic Hedges [Member] \| Interest Rate Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	64
Kentucky Utilities Co [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Cash collateral obligation under master netting arrangements	0		0
Cash collateral pledged - eligible for offset	0		0
Cash collateral pledged - eligible for offset	$ 0		$ 0