Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - Subordinated Debt, ZENS, Due 2029 - shares	Jun. 30, 2024	Dec. 31, 2023
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