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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables)
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Gain (Loss) on Securities
Gains and losses on equity securities, net of transaction costs, are recorded in Gain (loss) on equity securities in CenterPoint Energy’s Condensed Statements of Consolidated Income. The following table presents unrealized gains (losses), net on equity securities owned by CenterPoint Energy for each period presented:
Three Months Ended March 31,
20252024
(in millions)
AT&T Common$56 $9 
Charter Common23 (85)
WBD Common— (7)
Total gains (losses) on equity securities, net$79 $(83)
Schedule of Securities Classified as Trading
CenterPoint Energy and its subsidiaries hold shares of certain securities detailed in the table below, which are classified as trading securities. Shares of AT&T Common, Charter Common and WBD Common are expected to be held to facilitate CenterPoint Energy’s ability to meet its obligation under the ZENS. The following table presents information on CenterPoint Energy’s equity securities for each period presented:

Shares Held Carrying Value
March 31, 2025December 31, 2024March 31, 2025December 31, 2024
(in millions)
AT&T Common10,212,945 10,212,945 $289 $233 
Charter Common872,503 872,503 322 299 
WBD Common2,470,685 2,470,685 26 26 
Other3 3 
Total$640 $561 
Schedule of Reference Shares CenterPoint Energy’s reference shares for each ZENS consisted of the following:
March 31, 2025
December 31, 2024
(in shares)
AT&T Common0.7185 0.7185 
Charter Common0.061382 0.061382 
WBD Common0.173817 0.173817