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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | $ 259 | $ 244 | $ 746 | $ 718
Other Income (Expense) - net | 126 | 106 | 309 | 297
Cash Flow Hedges [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income | 25 | 17 | 28 | 25
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 | 19 | 27 | 39 | 26
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 | (22) | 0 | (30) | 0
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) | (6) | (6)
Amount of gain (loss) reclassified from AOCI to income | (2) |  | (6) |
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 | 41 | 27 | 69 | 26
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income |  | 1 |  | 1
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 | 27 | 18 | 34 | 30
Amount of gain (loss) reclassified from AOCI to income | 27 |  | 34 |
Hedged items | (27) |  | (34) |
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 | 0 | 0 | 1 | 11
Not Designated As Hedging Instruments [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (loss) recognized in income on derivative | 43 | 39 | 53 | 88
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 | (2) | 2 | (5) | 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) | (1) | (3) | (4)
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 | 44 | 40 | 56 | 92
LG And E And KU Energy LLC [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 57 | 52 | 169 | 154
Other Income (Expense) - net | 2 | 0 | 2 | (2)
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 | (2) | 2 | (5) | 7
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 | (1) | (1) | (3) | (4)
Louisville Gas And Electric Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 22 | 20 | 65 | 57
Other Income (Expense) - net | 0 | (3) | (1) | (5)
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 | (2) | 2 | (5) | 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) | (1) | (3) | (4)
Kentucky Utilities Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 28 | 24 | 82 | 74
Other Income (Expense) - net | $ 4 | $ 1 | $ 4 | $ 1

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