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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 1999
Subordinated Debt, ZENS, Due 2029 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Outstanding debt balance | $ 828 |
Subordinated Debt, ZENS, Due 2029 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Aggregate principal |  | $ 1,000
Subordinated note cash exchangeable percentage of fair value (as a percent) | 95.00% |
ZENS annual interest rate (as a percent) | 2.00% |
Target annual yield on reference shares (as a percent) | 2.309% |
Contingent principal amount of ZENS | $ 2 |

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