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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | $ 253 | $ 246 | $ 501 | $ 487
Other Income (Expense) - net | 76 | 131 | 201 | 183
Cash Flow Hedges [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income | 24 | 33 | 27 | 3
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 | 34 | 43 | 44 | 20
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 | (5) | (8) | (10) | (8)
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 | (2) | (2) | (5) | (4)
Amount of gain (loss) reclassified from AOCI to income | (2) |  | (5) |
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 |  | 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 | 39 | 51 | 54 | 28
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] | Other Income (Expense) Net [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income | 26 | 35 | 32 | 7
Amount of gain (loss) reclassified from AOCI to income | 26 |  | 32 |
Hedged items | (26) |  | (32) |
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Derivative Gain (Loss) Recognized in OCI | 1 | 1 | 1 | 1
Not Designated As Hedging Instruments [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (loss) recognized in income on derivative | (1) | 44 | 60 | 10
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 | (2) | (7) | (3)
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) | (1) | (3) | (2)
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 | 1 | 45 | 63 | 12
LG And E And KU Energy LLC [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 58 | 58 | 116 | 112
Other Income (Expense) - net | 2 | 0 | 2 | 0
LG And E And KU Energy LLC [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 | 1 | (2) | (7) | (3)
LG And E And KU Energy LLC [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 | (2) | (1) | (3) | (2)
Louisville Gas And Electric Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 22 | 22 | 44 | 43
Other Income (Expense) - net | 1 | (1) | 0 | (1)
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 | 1 | (2) | (7) | (3)
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 | (2) | (1) | (3) | (2)
Kentucky Utilities Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 29 | 28 | 57 | 54
Other Income (Expense) - net | $ 0 | $ (2) | $ 1 | $ 0

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