XML 178 R46.htm IDEA: XBRL DOCUMENT
v3.25.3

Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) (Tables) | 9 Months Ended
--- | ---
Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (in millions)
AT&T Common |  | $ | (8) |  |  | $ | 29 |  |  | $ | 55 |  |  | $ | 53 |
Charter Common |  | (116) |  |  | 22 |  |  | (59) |  |  | (56) |
WBD Common |  | 20 |  |  | 3 |  |  | 22 |  |  | (7) |
Total gains (losses) on equity securities, net |  | $ | (104) |  |  | $ | 54 |  |  | $ | 18 |  |  | $ | (10) |
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
|  | September 30, 2025 |  | December 31, 2024 |  | September 30, 2025 |  | December 31, 2024
|  |  |  |  |  | (in millions)
AT&T Common |  | 10,212,945 |  |  | 10,212,945 |  |  | $ | 288 |  |  | $ | 233 |
Charter Common |  | 872,503 |  |  | 872,503 |  |  | 240 |  |  | 299 |
WBD Common |  | 2,470,685 |  |  | 2,470,685 |  |  | 48 |  |  | 26 |
Other |  |  |  |  |  | 3 |  |  | 3 |
Total |  |  |  |  |  | $ | 579 |  |  | $ | 561 |
Schedule of Reference Shares | CenterPoint Energy’s reference shares for each ZENS consisted of the following:
| September 30, 2025 |  | December 31, 2024
| (in shares)
AT&T Common | 0.7185 |  |  | 0.7185 |
Charter Common | 0.061382 |  |  | 0.061382 |
WBD Common | 0.173817 |  |  | 0.173817 |

X
- Definition Schedule of Indexed Debt Securities and Marketable Securities [Table Text Block] + References No definition available. + Details
Name: | cnp_ScheduleOfIndexedDebtSecuritiesAndMarketableSecuritiesTableTextBlock
Namespace Prefix: | cnp_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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(9)(a)) -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(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_GainLossOnInvestmentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
Name: | us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration