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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | $ 188 | $ 165 | $ 549 | $ 494 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | 32 | 16 | 86 | 51 |
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 | 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) | (3) | (3) |
Amount of gain (loss) reclassified from AOCI to income | (1) | (1) | (3) | (3) |
Not Designated As Hedging Instruments [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (loss) recognized in income on derivative | (6) | (5) | (31) | (12) |
Gain (loss) recognized as regulatory liabilities/assets | (8) | (8) | 34 | 11 |
Asset value | 2 |  | 2 |  | $ 1
Liability value | 34 |  | 34 |  | 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 |  | 0
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 |  | 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 | (3) | 4 | 0 | 4 |
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 | (6) |  | $ (31) |  |
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 | (3) |  | $ 3 |  |
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 | (2) |  | 31 |  |
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) |  | (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 |  | (4) |  | (11) |
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 |  | 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 |  | 2 |  | (5) |
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 |  | (14) |  | 12 |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | 26 | 25 | 78 | 76 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | 3 | 0 | 9 | 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 |  | 0
Liability value | 7 |  | 7 |  | 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 |  | 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 |  | 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 | 6 |  | 6 |  | 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 | $ 0 | $ 0 |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense | Interest Expense | 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 |  | 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
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 |  |  |  |  | $ 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 | (3) | $ 4 | 0 | $ 4 |
Kentucky Utilities Co [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense |  |  | 102 | 99 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | $ 4 | $ 1 | $ 10 | $ 6 |

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