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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 | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | $ (10) | $ 15 | $ (7)
CERC Corp |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | 10 | (15) | 7
CenterPoint Energy | Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | 173 | 167 | 189
CenterPoint Energy | CERC Corp |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | $ 236 | $ 237 | $ 257

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