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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | $ 165 | $ 136 | $ 494 | $ 361 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | 16 | 10 | 51 | 36 |
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) | 0 | (3) | (2) |
Amount of gain (loss) reclassified from AOCI to income | (1) | 0 | (3) | (2) |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Income (Loss) from Discontinued Operations (net of income taxes) |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income |  | 0 |  | 0 |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Income (Expense) -net |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Amount of gain (loss) reclassified from AOCI to income | 0 |  | 0 |  |
Not Designated As Hedging Instruments [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (loss) recognized in income on derivative | (5) | 17 | (12) | 27 |
Gain (loss) recognized as regulatory liabilities/assets | (8) |  | 11 |  |
Asset value | 0 |  | 0 |  | $ 25
Liability value | 37 |  | 37 |  | 73
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 5
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Liability value | 29 |  | 29 |  | 63
Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 20
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Liability value | 8 |  | 8 |  | 10
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 |  | $ 1 |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Interest Expense |  | Interest Expense |
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 | $ 3 | 4 | $ 11 |
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 |  | $ 17 |  | $ 26 |
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 | 2 |  | (5) |  |
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 | (14) |  | 12 |  |
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 | Energy Purchases |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (loss) recognized in income on derivative | (4) |  | (11) |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | 25 | $ 23 | 76 | $ 64 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | 0 | 0 | 2 | 3 |
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
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | 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] | Current Liabilities [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Liability value | 0 |  | 0 |  | 1
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current 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] | Noncurrent Liabilities [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Liability value | 3 |  | 3 |  | 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 | $ 1 |
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] | 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] | Current Liabilities [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Liability value | 0 |  | 0 |  | 1
Louisville Gas And Electric Co [Member] | 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 |  | 0
Louisville Gas And Electric Co [Member] | 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 |  | 3 |  | $ 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 | 4 | $ 3 | 4 | $ 11 |
Kentucky Utilities Co [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Other Income (Expense) - net | $ 1 | $ 2 | $ 6 | $ 6 |

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