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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | $ 190 | $ 179 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | 28 | 22 |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Derivative Gain (Loss) Recognized in OCI |  | 0 |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (1) | (1) |
Amount of gain (loss) reclassified from AOCI to income | (1) | (1) |
Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (5) | (16) |
Gain (loss) recognized as regulatory liabilities/assets | 18 | 28 |
Asset value | 22 |  | $ 9
Liability value | 11 |  | 16
Not Designated As Hedging Instruments [Member] | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 6 |  | 2
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 |  | 0
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | (1) | 2 |
Not Designated As Hedging Instruments [Member] | Gas Contracts |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | $ (5) | $ (16) |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Energy purchases | Energy purchases |
Not Designated As Hedging Instruments [Member] | Gas Contracts | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | $ 1 |  |
Not Designated As Hedging Instruments [Member] | Gas Contracts | Regulatory Assets, current |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 18 |  |
Not Designated As Hedging Instruments [Member] | Gas Contract | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 6 |  | 2
Not Designated As Hedging Instruments [Member] | Gas Contract | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets |  | $ 4 |
Not Designated As Hedging Instruments [Member] | Gas Contract | Regulatory Assets, current |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets |  | 22 |
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 26 | 26 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | 3 | 2 |
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 |  | 0
Liability value | 5 |  | 3
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 |  | 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Price risk management liabilities, current |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 1 |  | 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Price risk management, liabilities, noncurrent |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 4 |  | 3
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | $ 0 | $ 0 |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense | Interest Expense |
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | $ 0 |  | 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Price risk management liabilities, current |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 1 |  | 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Price risk management, liabilities, noncurrent |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value |  |  | $ 3
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | (1) | $ 2 |
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 35 | 34 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | $ 5 | $ 2 |

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