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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 1999
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Unrealized gains (losses) | $ 49 | $ (206) | $ 56 | $ (370) |
Subordinated Debt ZENS |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 828 |  | $ 828 |  | $ 1,000
Subordinated note cash exchangeable percentage of fair value (as a percent) |  |  | 95.00% |  |
ZENS annual interest rate (as a percent) | 2.00% |  | 2.00% |  |
Target annual yield on reference shares (as a percent) | 2.309% |  | 2.309% |  |
Contingent principal amount of ZENS | $ 20 |  | $ 20 |  |

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