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Derivative Instruments and Hedging Activities - Intro (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Master Netting Arrangements (Numeric) [Line Items] |  |
Cash Collateral Obligation Under Master Netting Arrangement | $ 27 | $ 19
Cash collateral posted under master netting arrangements | 2 | 3
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 | 2 | 3
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 | $ 2 | $ 3

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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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- References No definition available. + Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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