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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | $ 994 | $ 963 | $ 901
Other Income (Expense) - net | 309 | 396 | (88)
Cash Flow Hedges [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (18) | 35 | (91)
Cash Flow Hedges [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | (13) | 45 | (98)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | (30) | 4 | 0
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 | (9) | (8) | (9)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (9) |  |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 17 | 41 | (98)
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Income (Expense) Net [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income | (9) | 42 | (82)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Amount of gain (loss) reclassified from AOCI to income | (9) |  |
Hedged Items | 9 |  |
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (Loss) Reclassified from AOCI into Income |  | 1 |
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] | Other Comprehensive Income [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Gain (Loss) Recognized in OCI | 2 | 11 | 1
Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (19) | 145 | (267)
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 | (1) | 6 | 5
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 | (5) | (5) | (6)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Other Income (Expense) Net [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (14) | 150 | (261)
LG And E And KU Energy LLC [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 226 | 206 | 197
Other Income (Expense) - net | (13) | (16) | (8)
LG And E And KU Energy LLC [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 | (1) | 6 | 5
LG And E And KU Energy LLC [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 | (5) | (5) | (6)
Louisville Gas And Electric Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 87 | 76 | 71
Other Income (Expense) - net | (11) | (12) | (10)
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 | (1) | 6 | 5
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 | (5) | (5) | (6)
Kentucky Utilities Co [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest Expense | 109 | 100 | 96
Other Income (Expense) - net | $ (4) | $ (6) | $ (4)

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