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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | $ 249 | $ 259 | $ 750 | $ 746
Other Income (Expense) - net | 52 | 126 | 253 | 309
Cash Flow Hedges [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income | (60) | 25 | (33) | 28
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 | (64) | 19 | (20) | 39
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 | 3 | (22) | (7) | (30)
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 | (4) | (2) | (9) | (6)
Amount of gain (loss) reclassified from AOCI to income | (4) | (2) | (9) | (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 | 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 | (67) | 41 | (13) | 69
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 | 0
Hedged items | 0 | 0 | 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 | (56) | 27 | (24) | 34
Amount of gain (loss) reclassified from AOCI to income | (56) | 27 | (24) | 34
Hedged items | 56 | (27) | 24 | (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 | 1
Not Designated As Hedging Instruments [Member] |  |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |  |
Gain (loss) recognized in income on derivative | (20) | 43 | 40 | 53
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) | (5)
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) | (4) | (3)
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 | (19) | 44 | 44 | 56
LG And E And KU Energy LLC [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 56 | 57 | 172 | 169
Other Income (Expense) - net | 1 | 2 | 3 | 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) | (5)
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) | (4) | (3)
Louisville Gas And Electric Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 22 | 22 | 66 | 65
Other Income (Expense) - net | (1) | 0 | (1) | (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 | 2 | (2) | (5) | (5)
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) | (4) | (3)
Kentucky Utilities Co [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest Expense | 28 | 28 | 85 | 82
Other Income (Expense) - net | $ 1 | $ 4 | $ 2 | $ 4

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