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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 1999
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment in equity securities | $ 561,000,000 | $ 541,000,000 |  |  |
ZENS-Related Securities |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment in equity securities | $ 558,000,000 | $ 538,000,000 | $ 507,000,000 | $ 820,000,000 |
ZENS debt, due 2029 |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Subordinated note cash exchangeable percentage of fair value | 95.00% |  |  |  |
Interest Rate | 2.00% |  |  |  |
Target annual yield on reference shares (as a percent) | 2.309% |  |  |  |
Contingent principal amount of ZENS | $ 9,000,000 |  |  |  |
ZENS debt, due 2029 |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Aggregate Principal |  |  |  |  | $ 1,000,000,000.0
Long-term debt, gross | $ 828,000,000 |  |  |  |
Subordinated note cash exchangeable percentage of fair value | 95.00% |  |  |  |
The cash exchange amount from referenced shares per $1,000 face amount of individual notes | $ 640 |  |  |  |
Face amount of each indexed debt security notes issued by CenterPoint Energy in September 1999 | $ 1,000 |  |  |  |

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