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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Houston Electric |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Affiliate service charges (billings), net | $ 0 | $ (2) | $ (1) | $ (3)
CERC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Affiliate service charges (billings), net | 0 | 2 | 1 | 3
CenterPoint Energy | Houston Electric |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Corporate service charges | 47 | 44 | 90 | 79
CenterPoint Energy | CERC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Corporate service charges | $ 51 | $ 55 | $ 106 | $ 106

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