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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | $ 513 | $ 918 | $ 634
Other Income (Expense) - net | 54 | 15 | 2
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Income (Loss) from Discontinued Operations (net of income taxes) | 42 | (1,498) | 829
Cash Flow Hedges [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (3) | (30) | (32)
Cash Flow Hedges [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 0 | (50) | (24)
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 | (9)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Income (Expense) Net [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 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) | 11 | (8)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (3) | 11 | (8)
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)
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)
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Income (Expense) Net [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | 0 |  |
Hedged Items | 0 |  |
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)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income |  | (39) | (22)
Hedged Items |  | 39 | 22
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
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 | 39 | (268) | (103)
Gain (loss) recognized as regulatory liabilities/assets | 50 | 5 | (2)
Asset value | 25 | 0 |
Liability value | 73 | 18 |
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 20 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 63 | 1 |
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 5 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 10 | 17 |
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 | $ (2) | (2) | (5)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense |  |
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 | 1 | 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 | 6 | 17 |
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 | 11 | 5 | (2)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | $ 0 | (266) | (98)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Income (Loss) from Discontinued Operations (net of income taxes) |  |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | $ 41 | 0 | 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Energy purchases |  |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Current Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | $ 20 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Current Liabilities [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Liability value | 62 | 0 |
Derivatives Not Designated As Hedging Instruments [Member] | Gas Contract | Noncurrent Assets [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Asset value | 5 | 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 | 4 | 0 |
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 | 39 | 0 | 0
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 89 | 81 | 87
Other Income (Expense) - net | 4 | (5) | (1)
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 | 7 | 18 |
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 | 1 | 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 | 6 | 17 |
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 | $ (2) | (2) | (5)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense |  |
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 | 1 | 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 | 6 | 17 |
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 | 11 | 5 | (2)
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 117 | 109 | 113
Other Income (Expense) - net | $ 8 | $ 4 | $ 3

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