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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - Subordinated Debt, ZENS, Due 2029 - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Sep. 30, 1999
Debt and Equity Securities, FV-NI [Line Items]    
Debt instrument, face amount   $ 1,000
Outstanding debt balance $ 828  
Subordinated note cash exchangeable percentage of fair value (as a percent) 95.00%  
ZENS annual interest rate (as a percent) 2.00%  
Target annual yield on reference shares (as a percent) 2.309%  
Contingent principal amount of ZENS $ 13