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Derivative Instruments and Hedging Activities (Tables) | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
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 of derivative instruments on the Balance Sheets:
| June 30, 2025 |  | December 31, 2024
| Derivatives designated as hedging instruments |  | Derivatives not designated as hedging instruments |  | Derivatives designated as hedging instruments |  | Derivatives not designated as hedging instruments
| Assets |  | Liabilities |  | Assets |  | Liabilities |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets/Liabilities (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (b) | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Gas contracts | — |  |  | — |  |  | 6 |  |  | 3 |  |  | — |  |  | — |  |  | 7 |  |  | 10 |
Total current | 2 |  |  | — |  |  | 6 |  |  | 3 |  |  | — |  |  | — |  |  | 7 |  |  | 10 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets/Liabilities (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (b) | — |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Gas contracts | — |  |  | — |  |  | 4 |  |  | 5 |  |  | — |  |  | — |  |  | 2 |  |  | 3 |
Total noncurrent | — |  |  | — |  |  | 4 |  |  | 10 |  |  | — |  |  | — |  |  | 2 |  |  | 6 |
Total derivatives | $ | 2 |  |  | $ | — |  |  | $ | 10 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | 16 |
(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. (b)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 June 30, 2025.
| Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
| Three Months |  | Six Months
| Interest Expense |  |  |  | Interest Expense |  |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded | $ | 199 |  |  |  |  | $ | 389 |  |  |  |
The effects of cash flow hedges: |  |  |  |  |  |  |  |
Gain (Loss) on cash flow hedging relationships: |  |  |  |  |  |  |  |
Interest rate derivatives: |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income | (1) |  |  |  |  | (2) |  |  |  |
| The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended June 30, 2024.
| Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships |
| Three Months |  | Six Months |
| Interest Expense |  |  |  | Interest Expense |  |  |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded | $ | 182 |  |  |  |  | $ | 361 |  |  |  |  |
The effects of cash flow hedges: |  |  |  |  |  |  |  |  |
Gain (Loss) on cash flow hedging relationships: |  |  |  |  |  |  |  |  |
Interest rate derivatives: |  |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income | (1) |  |  |  |  | (2) |  |  |  |  |
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
June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 12 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 13 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 10 |
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, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 9 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 16 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 11 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
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 June 30, 2025.
|  | Three Months |  | Six Months |  |  |  | Three Months |  | Six Months
Derivative Relationships |  | Derivative Gain (Loss) Recognized in OCI |  | Derivative Gain (Loss) Recognized in OCI |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Gain (Loss) Reclassified from AOCI into Income |  | Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | 2 |  |  | $ | 2 |  |  | Interest expense |  | $ | (1) |  |  | $ | (2) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Three Months |  | Six Months
Gas contracts |  | Energy purchases |  | $ | — |  |  | $ | (5) |
|  | Total |  | $ | — |  |  | $ | (5) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  | Three Months |  | Six Months
Interest rate derivatives |  | Regulatory assets - noncurrent |  | $ | (1) |  |  | $ | (2) |
Gas contracts |  | Regulatory liabilities - current |  | (12) |  |  | 6 |
|  | Regulatory assets - noncurrent |  | (1) |  |  | — |
|  | Total |  | $ | (14) |  |  | $ | 4 |
| 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 June 30, 2024.
|  | Three Months |  | Six Months |  |  |  | Three Months |  | Six Months
Derivative Relationships |  | Derivative Gain (Loss) Recognized in OCI |  | Derivative Gain (Loss) Recognized in OCI |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Gain (Loss) Reclassified from AOCI into Income |  | Gain (Loss) Reclassified from AOCI into Income
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | — |  |  | Interest expense |  | $ | (1) |  |  | $ | (2) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Three Months |  | Six Months
Gas contracts |  | Energy purchases |  | $ | (9) |  |  | $ | (25) |
|  | Total |  | $ | (9) |  |  | $ | (25) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  | Three Months |  | Six Months
Interest rate derivatives |  | Regulatory assets - noncurrent |  | $ | 1 |  |  | $ | 2 |
Gas contracts |  | Regulatory assets - current |  | 11 |  |  | 33 |
|  | Regulatory assets - noncurrent |  | 2 |  |  | 6 |
|  | Total |  | $ | 14 |  |  | $ | 41 |
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.
| June 30, 2025 |  | December 31, 2024
| Assets |  | Liabilities |  | Assets |  | Liabilities
Noncurrent: |  |  |  |  |  |  |
Price Risk Management Assets/Liabilities: |  |  |  |  |  |  |
Interest rate derivatives | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | 3 |
Total noncurrent | — |  |  | 5 |  |  | — |  |  | 3 |
Total derivatives | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | 3 |
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 June 30, 2025.
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Income on Derivatives |  | Three Months |  | Six Months
Interest rate derivatives |  | Interest expense |  | $ | — |  |  | $ | — |
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Regulatory Assets |  | Three Months |  | Six Months
Interest rate derivatives |  | Regulatory assets - noncurrent |  | $ | (1) |  |  | $ | (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 June 30, 2024.
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Income on Derivatives |  | Three Months |  | Six Months
Interest rate derivatives |  | Interest expense |  | $ | — |  |  | $ | — |
|  | Location of Gain (Loss) Recognized in |  |  |  |
Derivative Instruments |  | Regulatory Assets |  | Three Months |  | Six Months
Interest rate derivatives |  | Regulatory assets - noncurrent |  | $ | 1 |  |  | $ | 2 |
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
June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 12 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 13 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 10 |
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, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL | $ | 9 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 16 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 11 |
LG&E | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |

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