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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - Subordinated Debt, ZENS, Due 2029 - shares | Sep. 30, 2025 | Dec. 31, 2024
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AT&T Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.7185 | 0.7185
Charter Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.061382 | 0.061382
WBD Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.173817 | 0.173817

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
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