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Derivative Instruments - Interest Rate Hedging and Weather Hedges (Details) - Interest rate derivatives - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Not Designated as Hedging Instrument, Economic Hedge |  |
Economic hedge | $ 0 | $ 84
Cash Flow Hedging |  |
Economic hedge | 200 | 0
Cash Flow Hedging | Houston Electric |  |
Economic hedge | $ 100 | $ 0

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