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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
|  | (in millions)
AT&T Common |  | $ | (10) |  |  | $ | (57) |  |  | $ | (35) |  |  | $ | (94) |
Charter Common |  | 63 |  |  | (144) |  |  | 88 |  |  | (304) |
WBD Common |  | (5) |  |  | (5) |  |  | 3 |  |  | 28 |
Energy Transfer Common Units |  | — |  |  | — |  |  | — |  |  | 95 |
Energy Transfer Series G Preferred Units |  | — |  |  | — |  |  | — |  |  | (9) |
Other |  | 1 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 49 |  |  | $ | (206) |  |  | $ | 56 |  |  | $ | (284) |
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
|  | September 30, 2023 |  | December 31, 2022 |  | September 30, 2023 |  | December 31, 2022
|  |  |  |  |  | (in millions)
AT&T Common |  | 10,212,945 |  |  | 10,212,945 |  |  | $ | 153 |  |  | $ | 188 |
Charter Common |  | 872,503 |  |  | 872,503 |  |  | 384 |  |  | 296 |
WBD Common |  | 2,470,685 |  |  | 2,470,685 |  |  | 27 |  |  | 23 |
Other |  |  |  |  |  | 2 |  |  | 3 |
Total |  |  |  |  |  | $ | 566 |  |  | $ | 510 |
Schedule of Indexed Debt Securities and Marketable Securities | CenterPoint Energy’s reference shares for each ZENS consisted of the following:
| September 30, 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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- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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