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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Derivative Instruments And Hedging Activities [Line Items] |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments.
|  |  |  |  | March 31, 2024 |  |  |  |  |  | December 31, 2023
|  |  |  |  | Assets |  | Liabilities |  |  |  |  |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management Assets/Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (a) |  |  |  |  | $ | — |  |  | $ | 1 |  |  |  |  |  |  | $ | — |  |  | $ | 1 |
Gas contracts (a) |  |  |  |  | 1 |  |  | 30 |  |  |  |  |  |  | 1 |  |  | 51 |
Total current |  |  |  |  | 1 |  |  | 31 |  |  |  |  |  |  | 1 |  |  | 52 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management Assets/Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (a) |  |  |  |  | — |  |  | 4 |  |  |  |  |  |  | — |  |  | 6 |
Gas contracts (a) |  |  |  |  | — |  |  | 4 |  |  |  |  |  |  | — |  |  | 9 |
Total noncurrent |  |  |  |  | — |  |  | 8 |  |  |  |  |  |  | — |  |  | 15 |
Total derivatives |  |  |  |  | $ | 1 |  |  | $ | 39 |  |  |  |  |  |  | $ | 1 |  |  | $ | 67 |
(a)Current portion is included in "Other current assets" and "Other current liabilities" and noncurrent portion is included in "Other noncurrent assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets. Excludes accrued interest, if applicable. |
Derivative Instruments, Gain (Loss) | The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2024.
|  |  |  |  | Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships |
|  |  | Three Months |
|  |  |  |  | Interest Expense |  |  |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded |  |  |  |  | $ | 179 |  |  |  |  |
The effects of cash flow hedges: |  |  |  |  |  |  |  |  |
Gain (Loss) on cash flow hedging relationships: |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income |  |  |  |  | (1) |  |  |  |  |
| The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2023.
|  |  |  |  | Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships |
|  |  | Three Months |
|  |  |  |  | Interest Expense |  |  |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded |  |  |  |  | $ | 164 |  |  |  |  |
The effects of cash flow hedges: |  |  |  |  |  |  |  |  |
Gain (Loss) on cash flow hedging relationships: |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income |  |  |  |  | (1) |  |  |  |  |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
| Assets |  | Liabilities
|  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
| Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
| Assets |  | Liabilities
|  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
| Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 67 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location | The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2024.
|  |  |  | Three Months |  |  |  |  |  | Three Months
Derivative Relationships |  |  |  | Derivative Gain (Loss) Recognized in OCI |  | Location of Gain (Loss) Recognized in Income on Derivative |  |  |  | Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  |  | $ | — |  |  | Interest expense |  |  |  | $ | (1) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  |  |  | Three Months
Gas contracts |  | Energy purchases |  |  |  | $ | (16) |
|  | Total |  |  |  | $ | (16) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  |  |  | Three Months
Interest rate swaps |  | Regulatory assets - noncurrent |  |  |  | $ | 2 |
Gas contracts |  | Regulatory assets - current |  |  |  | 22 |
|  | Regulatory assets - noncurrent |  |  |  | 4 |
|  | Total |  |  |  | $ | 28 |
| The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2023.
|  |  |  | Three Months |  |  |  |  |  | Three Months
Derivative Relationships |  |  |  | Derivative Gain (Loss) Recognized in OCI |  | Location of Gain (Loss) Recognized in Income on Derivative |  |  |  | Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  |  | $ | — |  |  | Interest expense |  |  |  | $ | (1) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  |  |  | Three Months
Interest rate swaps |  | Interest expense |  |  |  | $ | — |
Gas contracts |  | Energy purchases |  |  |  | (2) |
|  | Other income (expense) - net |  |  |  | 1 |
|  | Total |  |  |  | $ | (1) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  |  |  | Three Months
Interest rate swaps |  | Regulatory assets - noncurrent |  |  |  | $ | (1) |
Gas contracts |  | Regulatory assets - current |  |  |  | 28 |
|  | Regulatory assets - noncurrent |  |  |  | (7) |
|  | Total |  |  |  | $ | 20 |
Louisville Gas And Electric Co [Member] |  |
Derivative Instruments And Hedging Activities [Line Items] |  |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments.
| March 31, 2024 |  | December 31, 2023
| Assets |  | Liabilities |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |
Price Risk Management Assets/Liabilities: |  |  |  |  |  |  |
Interest rate swaps | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Total current | — |  |  | 1 |  |  | — |  |  | 1 |
Noncurrent: |  |  |  |  |  |  |
Price Risk Management Assets/Liabilities: |  |  |  |  |  |  |
Interest rate swaps | — |  |  | 4 |  |  | — |  |  | 6 |
Total noncurrent | — |  |  | 4 |  |  | — |  |  | 6 |
Total derivatives | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | 7 |
Derivative Instruments, Gain (Loss) | The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2024.
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Income on Derivatives |  |  |  | Three Months
Interest rate swaps |  | Interest expense |  |  |  | $ | — |
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Regulatory Assets |  |  |  | Three Months
Interest rate swaps |  | Regulatory assets - noncurrent |  |  |  | $ | 2 |
| The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2023.
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Income on Derivatives |  |  |  | Three Months
Interest rate swaps |  | Interest expense |  |  |  | $ | — |
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Regulatory Assets |  |  |  | Three Months
Interest rate swaps |  | Regulatory assets - noncurrent |  |  |  | $ | (1) |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
| Assets |  | Liabilities
|  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
| Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
| Assets |  | Liabilities
|  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
| Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 67 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |

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