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Derivative Instruments and Hedging Activities - Intro (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Master Netting Arrangements (Numeric) [Line Items] |  |
Cash Collateral Obligation Under Master Netting Arrangement | $ 16 | $ 20
Cash collateral posted under master netting arrangements | 5 | 0
LG And E And KU Energy LLC [Member] |  |
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash Collateral Obligation Under Master Netting Arrangement | 0 | 0
Cash collateral posted under master netting arrangements | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash Collateral Obligation Under Master Netting Arrangement | 0 | 0
Cash collateral posted under master netting arrangements | 0 | 0
Kentucky Utilities Co [Member] |  |
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash Collateral Obligation Under Master Netting Arrangement | 0 | 0
Cash collateral posted under master netting arrangements | $ 0 | $ 0

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- Definition Obligation to return cash collateral received from counterparties under terms of master netting arrangements. + References No definition available. + Details
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- Definition The amount of cash collateral posted under master netting arrangements. + References No definition available. + Details
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- Details
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- Details
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- Details
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