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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | $ 918 | $ 634 | $ 621
Other Income (Expense) - net | 15 | 2 | 14
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Income (Loss) from Discontinued Operations (net of income taxes) | (1,498) | 829 | 1,010
Cash Flow Hedges [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (30) | (32) | (18)
Cash Flow Hedges [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | (50) | (24) | (13)
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 | (9) | (30)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | 11 | (8) | (9)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 11 | (8) | (9)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Discontinued Operations (net of income taxes) |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (2) | (2) |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (2) | (2) | 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | (50) | (15) | 17
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 | 0
Hedged Items | 0 | 0 | 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Discontinued Operations (net of income taxes) |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (39) | (22) | (9)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (39) | (22) | (9)
Hedged Items | 39 | 22 | 9
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] | Discontinued Operations (net of income taxes) |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 1 | 1 | 2
Derivatives Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 146 |
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 94 |
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] | Cross Currency Swaps [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 0 | 94 |
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Contracts [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] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (268) | (103) | (19)
Asset value | 0 | 0 |
Derivatives Not Designated As Hedging Instruments [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 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] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 5 | (2) | (1)
Derivatives 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 | (2) | (5) | (5)
Derivatives Not Designated As Hedging Instruments [Member] | Cross Currency 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] | Foreign Currency Contracts [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] | Foreign Currency Contracts [Member] | Discontinued Operations (net of income taxes) |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (266) | (98) | (14)
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 81 | 87 | 87
Other Income (Expense) - net | (5) | (1) | (11)
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 |
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] | 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] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 5 | (2) | (1)
Louisville Gas And Electric Co [Member] | Derivatives 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 | (2) | (5) | (5)
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 109 | 113 | 109
Other Income (Expense) - net | $ 4 | $ 3 | $ (4)

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