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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | $ 541 |  |
Beginning balance | 5 |  |
Beginning balance | 605 |  |
Gain (loss) on indexed debt securities | 14 | $ 27 | $ (325)
Gain (loss) on ZENS-related securities | 20 | 31 | (227)
Ending balance | 561 | 541 |
Ending balance | 2 | 5 |
Ending balance | 619 | 605 |
ZENS-Related Securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 538 | 507 | 820
Accretion of debt component of ZENS | 0 | 0 | 0
2% interest paid | 0 | 0 | 0
Distribution to ZENS holders | 0 | 0 | 0
Gain (loss) on indexed debt securities | 0 | 0 | 0
Gain (loss) on ZENS-related securities | 20 | 31 | (313)
Ending balance | 558 | 538 | 507
Debt Component of ZENS |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 5 | 7 | 10
Accretion of debt component of ZENS | 16 | 17 | 17
2% interest paid | (17) | (17) | (17)
Distribution to ZENS holders | (2) | (2) | (3)
Gain (loss) on indexed debt securities | 0 | 0 | 0
Gain (loss) on ZENS-related securities | 0 | 0 | 0
Ending balance | 2 | 5 | 7
Derivative Component of ZENS |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 605 | 578 | 903
Accretion of debt component of ZENS | 0 | 0 | 0
2% interest paid | 0 | 0 | 0
Distribution to ZENS holders | 0 | 0 | 0
Gain (loss) on indexed debt securities | 14 | 27 | (325)
Gain (loss) on ZENS-related securities | 0 | 0 | 0
Ending balance | $ 619 | $ 605 | $ 578

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- Definition The amount of annual balance buildup of the debt portion of indexed debt securities up to the contingent principal amount on debt component of ZENS. + References No definition available. + Details
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- Definition This represents a distribution of cash to ZENS holders during the period in accordance with the terms of the ZENS. + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period related to indexed debt securities. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of stated interest paid during the current period for interest owed on debt component of ZENS. + References No definition available. + Details
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- Definition Amount of unrealized and realized gain (loss) on 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 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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
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