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Derivative Instruments - Interest Rate Hedging and Weather Hedges (Details) - Interest rate derivatives - Cash Flow Hedge - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Derivative [Line Items] |  |
Economic hedge | $ 150 | $ 200
Houston Electric |  |
Derivative [Line Items] |  |
Economic hedge | $ 0 | $ 100

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