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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables)
 12 Months Ended
Dec. 31, 2024
Indexed Debt Securities [Abstract]  
Schedule o Gain (Loss) on Securities
Gains and losses on equity securities, net of transaction costs, are recorded as Gain (loss) on equity securities in CenterPoint Energy’s Statements of Consolidated Income. The following table presents unrealized gains (losses), net on equity securities owned by CenterPoint Energy for each period presented:

Year Ended December 31,
202420232022
(in millions)
AT&T Common$62 $(17)$(63)
Charter Common(40)43 (273)
WBD Common(2)5 23 
Energy Transfer Common Units (1)
— — 95 
Energy Transfer Series G Preferred Units (1)
— — (9)
Total unrealized gains (losses) on equity securities, net$20 $31 $(227)
    
(1)In 2022, CenterPoint Energy completed the execution of its previously announced plan to exit the midstream sector by selling its remaining Energy Transfer Common Units and Energy Transfer Series G Preferred Units.
Schedule of Securities Classified as Trading
CenterPoint Energy and its subsidiaries hold shares of certain securities, 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 presented the shares held by CenterPoint Energy and their carrying value for each period presented:

Shares Held at December 31, Carrying Value at December 31,
2024202320242023
(in millions)
AT&T Common10,212,945 10,212,945 $233 $171 
Charter Common872,503 872,503 299 339 
WBD Common2,470,685 2,470,685 26 28 
Other3 3 
Total
$561 $541 
Schedule of Financial Information on Investment in Time Warner Securities and Indexed Debt Security Obligation CenterPoint Energy’s reference shares for each ZENS consisted of the following as of the dates presented:
December 31, 2024December 31, 2023
(in shares)
AT&T Common0.7185 0.7185 
Charter Common0.061382 0.061382 
WBD Common0.173817 0.173817 
The following table provides summarized financial information related to CenterPoint Energy’s investment in ZENS-Related Securities and each component of CenterPoint Energy’s ZENS obligation for the periods presented: 
 ZENS-Related
Securities		Debt
Component
of ZENS		Derivative
Component
of ZENS
(in millions)
Balance as of December 31, 2021$820 $10 $903 
Accretion of debt component of ZENS— 17 — 
2% interest paid— (17)— 
Distribution to ZENS holders— (3)— 
Gain on indexed debt securities— — (325)
Loss on ZENS-Related Securities(313)— — 
Balance as of December 31, 2022507 7 578 
Accretion of debt component of ZENS— 17 — 
2% interest paid— (17)— 
Distribution to ZENS holders— (2)— 
Loss on indexed debt securities— — 27 
Gain on ZENS-Related Securities31 — — 
Balance as of December 31, 2023538 5 605 
Accretion of debt component of ZENS— 16 — 
2% interest paid— (17)— 
Distribution to ZENS holders— (2)— 
Loss on indexed debt securities— — 14 
Gain on ZENS-Related Securities20 — — 
Balance as of December 31, 2024$558 $2 $619