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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2023
Derivative Instruments And Hedging Activities [Line Items] |
Fair Value and Balance Sheet Location of Derivative Instruments | The following table presents the fair value and location of derivative instruments recorded on the Balance Sheets:
| December 31, 2023 |  | December 31, 2022
| 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 swaps (b) | $ | — |  |  | $ | — |  |  |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Gas contracts | — |  |  | — |  |  | 1 |  |  | 51 |  |  | — |  |  | — |  |  | 20 |  |  | 62 |
Total current | — |  |  | — |  |  | 1 |  |  | 52 |  |  | — |  |  | — |  |  | 20 |  |  | 63 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets/Liabilities (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (b) | — |  |  | — |  |  | — |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | 6 |
Gas contracts | — |  |  | — |  |  |  |  | 9 |  |  | — |  |  | — |  |  | 5 |  |  | 4 |
Total noncurrent | — |  |  | — |  |  | — |  |  | 15 |  |  | — |  |  | — |  |  | 5 |  |  | 10 |
Total derivatives | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |  |  | $ | 73 |
(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. (b)Excludes accrued interest, if applicable.
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet | The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities:
Derivative Relationships |  | Derivative Gain (Loss) Recognized in OCI |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Gain (Loss) Reclassified from AOCI into Income
2023 |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | Interest Expense |  | $ | (3) |
Total |  | $ | — |  |  |  |  | $ | (3) |
2022 |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | Interest Expense |  | $ | (3) |
Total |  | $ | — |  |  |  |  | $ | (3) |
Net Investment Hedges: |  |  |  |  |  |
2021 |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | Interest Expense |  | $ | 11 |
|  |  |  | Income (Loss) from Discontinued operations (net of taxes) |  | (2) |
Cross-currency swaps |  | (50) |  |  | Income (Loss) from Discontinued operations (net of taxes) |  | (39) |
Total |  | $ | (50) |  |  |  |  | $ | (30) |
Net Investment Hedges: |  |  |  |  |  |
Foreign currency contracts in Discontinued operations |  | $ | 1 |  |  |  |  |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  | 2023 |  | 2022 |  | 2021
Foreign currency contracts |  | Income (Loss) from Discontinued Operations (net of taxes) |  | $ | — |  |  | $ | — |  |  | $ | (266) |
Interest rate swaps |  | Interest Expense |  | — |  |  | (2) |  |  | (2) |
Gas contracts |  | Energy Purchases |  | (19) |  |  | 41 |  |  | — |
|  | Other income (expense) - net |  | (1) |  |  | $ | — |  |  | $ | — |
|  | Total |  | $ | (20) |  |  | $ | 39 |  |  | $ | (268) |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  | 2023 |  | 2022 |  | 2021
Gas contracts |  | Regulatory assets - current |  | $ | 9 |  |  | $ | 39 |  |  | $ | — |
|  | Regulatory assets - noncurrent |  | (8) |  |  | — |  |  | — |
Interest rate swaps |  | Regulatory assets - noncurrent |  | — |  |  | 11 |  |  | 5 |
|  | Total |  | $ | 1 |  |  | $ | 50 |  |  | $ | 5 |
The following table presents the effect of cash flow hedge activity on the Statement of Income for the year ended December 31, 2023:
| Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
| Interest Expense |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded | $ | 666 |  |  |
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 | (3) |  |  |
Cross-currency swaps: |  |  |
Hedged items | — |  |  |
Amount of gain (loss) reclassified from AOCI to income | — |  |  |
The following table presents the effect of cash flow hedge activity on the Statement of Income for the year ended December 31, 2022:
| Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
| Interest Expense |  |
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded | $ | 513 |  |  |
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 | (3) |  |  |
Cross-currency swaps: |  |  |
Hedged items | — |  |  |
Amount of gain (loss) reclassified from AOCI to income | — |  |  |
The following table presents the effect of cash flow hedge activity on the Statement of Income for the year ended December 31, 2021:
| Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
| Interest Expense |  | Income (Loss) from Discontinued Operations (net of income taxes)
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded | $ | 918 |  |  | $ | (1,498) |
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 | 11 |  |  | (2) |
Cross-currency swaps: |  |  |
Hedged items | — |  |  | 39 |
Amount of gain (loss) reclassified from AOCI to income | — |  |  | (39) |
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
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 67 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 25 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 73 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 11 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
Louisville Gas And Electric Co [Member] |
Derivative Instruments And Hedging Activities [Line Items] |
Fair Value and Balance Sheet Location of Derivative Instruments | The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments:
|  | December 31, 2023 |  | December 31, 2022
|  | 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 |  | — |  |  | 6 |  |  | — |  |  | 6 |
Total noncurrent |  | — |  |  | 6 |  |  | — |  |  | 6 |
Total derivatives |  | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet | The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets:
Derivative Instruments |  | Location of Gain (Loss) |  | 2023 |  | 2022 |  | 2021
Interest rate swaps |  | Interest Expense |  | $ | — |  |  | $ | (2) |  |  | $ | (2) |
Derivative Instruments |  | Location of Gain (Loss) |  | 2023 |  | 2022 |  | 2021
Interest rate swaps |  | Regulatory assets - noncurrent |  | $ | — |  |  | $ | 11 |  |  | $ | 5 |
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
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 67 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 25 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 73 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 11 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
Kentucky Utilities Co [Member] |
Derivative Instruments And Hedging Activities [Line Items] |
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
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 67 |  |  | $ | — |  |  | $ | — |  |  | $ | 67 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 25 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 73 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 11 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | 7 |

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