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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | $ 107 | $ 153 |
Other Income (Expense) - net | 0 | 0 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Loss from Discontinued Operations (net of income taxes) | 0 | (2,043) |
Cash Flow Hedges [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (1) | (39) |
Cash Flow Hedges [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Derivative Gain (Loss) Recognized in OCI | 0 | (46) |
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) |
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] |  |  |
Gain (Loss) Reclassified from AOCI into Income |  | (1) |
Amount of gain (loss) reclassified from AOCI to income |  | 1 |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Operating Income (Expense) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 0 |  |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Comprehensive Income (Loss) [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Derivative Gain (Loss) Recognized in OCI |  | (46) |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 0 | 0 |
Hedged items | 0 | 0 |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Income (Loss) from Discontinued Operations (net of income taxes) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (Loss) Reclassified from AOCI into Income |  | (37) |
Amount of gain (loss) reclassified from AOCI to income |  | (37) |
Hedged items |  | 37 |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Operating Income (Expense) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 0 |  |
Hedged items | 0 |  |
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] | Income (Loss) from Discontinued Operations (net of income taxes) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Derivative Gain (Loss) Recognized in OCI |  | 1 |
Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative |  | (26) |
Asset value | 0 |  | $ 0
Not Designated As Hedging Instruments [Member] | 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 | 4 | 6 |
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
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] | Foreign Currency Contracts [Member] | Income (Loss) from Discontinued Operations (net of income taxes) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative |  | (25) |
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 20 | 21 |
Other Income (Expense) - net | (1) | (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
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
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
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 | 6 |
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | 1 | (1) |
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest Expense | 27 | 27 |
Other Income (Expense) - net | $ 0 | $ 1 |

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