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Related Party Transactions (Houston Electric and CERC) - Schedule of Amounts Charged For Services (Details) - Operation and maintenance expense - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Houston Electric |  |
Related Party Transaction [Line Items] |  |
Net affiliate service charges (billings) | $ (1) | $ (1)
CERC |  |
Related Party Transaction [Line Items] |  |
Net affiliate service charges (billings) | 1 | 1
CenterPoint Energy (1) | Houston Electric |  |
Related Party Transaction [Line Items] |  |
Corporate service charges | 43 | 35
CenterPoint Energy (1) | CERC |  |
Related Party Transaction [Line Items] |  |
Corporate service charges | $ 55 | $ 51

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