Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - shares	Dec. 31, 2023	Dec. 31, 2022
AT&T Common | ZENS debt, due 2029
Debt and Equity Securities, FV-NI [Line Items]
Number of shares referenced in exchangeable subordinated note	0.7185	0.7185
Charter Common | ZENS debt, due 2029
Debt and Equity Securities, FV-NI [Line Items]
Number of shares referenced in exchangeable subordinated note	0.061382	0.061382
WBD Common | ZENS debt, due 2029
Debt and Equity Securities, FV-NI [Line Items]
Number of shares referenced in exchangeable subordinated note	0.173817	0.173817