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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense, Operating and Nonoperating | $ 738 | $ 666 | $ 513
Other Income (Expense) - net | 114 | (40) | 54
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Income (Loss) from Discontinued Operations (net of income taxes) | 0 | 0 | 42
Cash Flow Hedges [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (3) | (3) | (3)
Cash Flow Hedges [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 0 | 0 | 0
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 0 | 0 | 0
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (3) | (3) | (3)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (3) | (3) | (3)
Derivatives Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Gas Contract | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Gas Contract | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Gas Contract | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Designated As Hedging Instruments [Member] | Gas Contract | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (40) | (20) | 39
Gain (loss) recognized as regulatory liabilities/assets | 59 | 1 | 50
Asset value | 9 | 1 |
Liability value | 16 | 67 |
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 7 | 1 |
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 10 | 52 |
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 2 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 6 | 15 |
Derivatives 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 | (2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense, Operating and Nonoperating |  |
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | $ 0 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 1 |
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 3 | 6 |
Derivatives 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 | 4 | 0 | 11
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 7 | 1 |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 10 | 51 |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 2 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 3 | 9 |
Derivatives 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 | 48 | 9 | 39
Derivatives 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 | (8) | 0
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Energy Purchases |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (40) | (19) | 41
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Other Income (Expense) - net |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | 0 | (1) | 0
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense, Operating and Nonoperating | 105 | 102 | 89
Other Income (Expense) - net | 12 | 3 | 4
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Liability value | 3 | 7 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 1 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 3 | 6 |
Louisville Gas And Electric Co [Member] | Derivatives 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 | (2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense, Operating and Nonoperating |  |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | $ 0 | 0 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 0 | 1 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 0 |
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 3 | 6 |
Louisville Gas And Electric Co [Member] | Derivatives 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 | 4 | 0 | 11
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Other Income (Expense) - net | $ 15 | $ 8 | $ 8

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