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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | $ 474 | $ 164 | $ 627 | $ 318 |
Other Income (Expense) - net | 13 | 10 | 13 | 5 |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Income (Loss) from Discontinued Operations (net of income taxes) | 555 | 191 | (1,488) | 541 |
Cash Flow Hedges [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (Loss) Reclassified from AOCI into Income | 11 | 24 | (28) | 27 |
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 | (4) | 34 | (50) | 44 |
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 | (5) | 0 | (10) |
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 | 14 | (2) | 13 | (4) |
Amount of gain (loss) reclassified from AOCI to income | 14 | (2) | 13 | (4) |
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) | 0 | (2) | (1) |
Amount of gain (loss) reclassified from AOCI to income | (1) | 0 | (2) | (1) |
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 | (4) | 39 | (50) | 54 |
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 | 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 | (2) | 26 | (39) | 32 |
Amount of gain (loss) reclassified from AOCI to income | (2) | 26 | (39) | 32 |
Hedged items | 2 | (26) | 39 | (32) |
Not Designated As Hedging Instruments [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (loss) recognized in income on derivative | (242) | (1) | (268) | 60 |
Asset value | 0 |  | 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 |  | 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 | (3) | 1 | 3 | (7) |
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) | (2) | (2) | (3) |
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 | (241) | 1 | (266) | 63 |
Designated As Hedging Instruments [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 146
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Asset value | 0 |  | 0 |  | 52
Louisville Gas And Electric Co [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | 20 | 22 | 41 | 44 |
Other Income (Expense) - net | 3 | 1 | 1 | 0 |
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
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] | 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] | Regulatory Assets Noncurrent [Member] |  |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |  |
Gain (loss) recognized as regulatory liabilities/assets | (3) | 1 | 3 | (7) |
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) | (2) | (2) | (3) |
Kentucky Utilities Co [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest Expense | 27 | 29 | 54 | 57 |
Other Income (Expense) - net | $ 3 | $ 0 | $ 4 | $ 1 |

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