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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Bcf | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net | $ 0 | $ 0 | $ 0 | $ 0 |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Cash collateral obligation under master netting arrangements | 0 |  | 0 |  | $ 0
Cash collateral pledged - eligible for offset | 0 |  | 0 |  | 0
Cash collateral pledged - eligible for offset | 0 |  | 0 |  | 0
Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 2 |  | 2 |  | 1
Liability value | 26 |  | 26 |  | 67
Other Current Assets | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 2 |  | 2 |  | 1
Other Noncurrent Assets [Member] | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Other Current Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 20 |  | 20 |  | 52
Other Noncurrent Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 6 |  | 6 |  | 15
Interest Rate Swaps [Member] | Other Current Assets | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Interest Rate Swaps [Member] | Other Noncurrent Assets [Member] | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Interest Rate Swaps [Member] | Other Current Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 0 |  | 0 |  | 1
Interest Rate Swaps [Member] | Other Noncurrent Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 4 |  | 4 |  | 6
Gas Contract | Other Current Assets | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 2 |  | 2 |  | 1
Gas Contract | Other Noncurrent Assets [Member] | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Gas Contract | Other Current Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 20 |  | 20 |  | 51
Gas Contract | Other Noncurrent Liabilities | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Liability value | 2 |  | 2 |  | 9
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount | $ 64 |  | 64 |  |
Rhode Island Energy | Economic Hedges [Member] | Gas Contract |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Volume | Bcf | 53 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Cash collateral obligation under master netting arrangements | $ 0 |  | 0 |  | 0
Cash collateral pledged - eligible for offset | 0 |  | 0 |  | 0
Cash collateral pledged - eligible for offset | 0 |  | 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 |  | 0
Liability value | 4 |  | 4 |  | 7
Louisville Gas And Electric Co [Member] | Other Current Assets | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Louisville Gas And Electric Co [Member] | Other Noncurrent Assets [Member] | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member] | Other Current Assets | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member] | Other Noncurrent Assets [Member] | Not Designated As Hedging Instruments [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 0
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 |  | 64 |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |
Cash collateral obligation under master netting arrangements | 0 |  | 0 |  | 0
Cash collateral pledged - eligible for offset | 0 |  | 0 |  | 0
Cash collateral pledged - eligible for offset | $ 0 |  | $ 0 |  | $ 0

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