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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables) | 9 Months Ended
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Sep. 30, 2024
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 September 30, |  | Nine Months Ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (in millions)
AT&T Common |  | $ | 29 |  |  | $ | (10) |  |  | $ | 53 |  |  | $ | (35) |
Charter Common |  | 22 |  |  | 63 |  |  | (56) |  |  | 88 |
WBD Common |  | 3 |  |  | (5) |  |  | (7) |  |  | 3 |
Other |  | — |  |  | 1 |  |  | — |  |  | — |
Total gains (losses) on equity securities, net |  | $ | 54 |  |  | $ | 49 |  |  | $ | (10) |  |  | $ | 56 |
Schedule of Debt Securities, Trading, and Equity Securities, FV-NI | 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
|  | September 30, 2024 |  | December 31, 2023 |  | September 30, 2024 |  | December 31, 2023
|  |  |  |  |  | (in millions)
AT&T Common |  | 10,212,945 |  |  | 10,212,945 |  |  | $ | 224 |  |  | $ | 171 |
Charter Common |  | 872,503 |  |  | 872,503 |  |  | 283 |  |  | 339 |
WBD Common |  | 2,470,685 |  |  | 2,470,685 |  |  | 21 |  |  | 28 |
Other |  |  |  |  |  | 3 |  |  | 3 |
Total |  |  |  |  |  | $ | 531 |  |  | $ | 541 |
Schedule of Indexed Debt Securities and Marketable Securities | CenterPoint Energy’s reference shares for each ZENS consisted of the following:
| September 30, 2024 |  | December 31, 2023
| (in shares)
AT&T Common | 0.7185 |  |  | 0.7185 |
Charter Common | 0.061382 |  |  | 0.061382 |
WBD Common | 0.173817 |  |  | 0.173817 |

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