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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | $ 179 | $ 164 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | 22 | 30 |
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 | 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 | (16) | (1) |
Gain (loss) recognized as regulatory liabilities/assets | 28 | 20 |
Asset value | 1 |  | $ 1
Liability value | 39 |  | 67
Not Designated As Hedging Instruments [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] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative |  | $ 0 |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Interest Expense |
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 | 2 | $ (1) |
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 | $ (16) |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | 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 | $ 4 |  |
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 | 22 |  |
Not Designated As Hedging Instruments [Member] | Gas Contracts | Other Nonoperating Income (Expense) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative |  | 1 |
Not Designated As Hedging Instruments [Member] | Gas Contracts | Purchased Power And Gas |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative |  | (2) |
Not Designated As Hedging Instruments [Member] | Gas Contract | Other Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 |  | 0
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 |  | (7) |
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 |  | 28 |
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 26 | 25 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | 2 | 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 |  | 7
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 |  | 1
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 |  | 6
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 |  | 1
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 | 4 |  | $ 6
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 | 2 | $ (1) |
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 34 | 33 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Other Income (Expense) - net | $ 2 | $ 2 |

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