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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables) | 3 Months Ended
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Mar. 31, 2023
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.
|  |  |  |  |  | Gains (Losses) on Equity Securities
|  |  |  | Three Months Ended March 31,
|  |  |  |  |  | 2023 |  | 2022
|  |  |  |  |  | (in millions)
AT&T Common |  |  |  |  |  | $ | 9 |  |  | $ | (10) |
Charter Common |  |  |  |  |  | 16 |  |  | (93) |
WBD Common |  |  |  |  |  | 14 |  |  | — |
Energy Transfer Common Units |  |  |  |  |  | — |  |  | 95 |
Energy Transfer Series G Preferred Units |  |  |  |  |  | — |  |  | (9) |
Other |  |  |  |  |  | (1) |  |  | — |
Total |  |  |  |  |  | $ | 38 |  |  | $ | (17) |
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.
|  | Shares Held |  | Carrying Value
|  | March 31, 2023 |  | December 31, 2022 |  | March 31, 2023 |  | December 31, 2022
|  |  |  |  |  | (in millions)
AT&T Common |  | 10,212,945 |  |  | 10,212,945 |  |  | $ | 197 |  |  | $ | 188 |
Charter Common |  | 872,503 |  |  | 872,503 |  |  | 312 |  |  | 296 |
WBD Common |  | 2,470,685 |  |  | 2,470,685 |  |  | 37 |  |  | 23 |
Other |  |  |  |  |  | 2 |  |  | 3 |
Total |  |  |  |  |  | $ | 548 |  |  | $ | 510 |
Schedule of Indexed Debt Securities and Marketable Securities | CenterPoint Energy’s reference shares for each ZENS consisted of the following:
| March 31, 2023 |  | December 31, 2022
| (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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