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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Summarized Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | $ 510 |  |
Beginning balance | 7 |  |
Beginning balance | 578 |  |
Gain (loss) on indexed debt securities | 27 | $ (325) | $ (50)
Gain (loss) on ZENS-related securities | 31 | (227) | (172)
Ending balance | 541 | 510 |
Ending balance | 5 | 7 |
Ending balance | 605 | 578 |
ZENS-Related Securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 507 | 820 | 871
Accretion of debt component of ZENS | 0 | 0 | 0
2% interest paid | 0 | 0 | 0
Redemption of Series A Preferred Stock | 0 | 0 | 0
Gain (loss) on indexed debt securities | 0 | 0 | 0
Gain (loss) on ZENS-related securities | 31 | (313) | (51)
Ending balance | 538 | 507 | 820
Debt Component Of ZENS |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 7 | 10 | 15
Accretion of debt component of ZENS | 17 | 17 | 17
2% interest paid | (17) | (17) | (17)
Redemption of Series A Preferred Stock | (2) | (3) | (5)
Gain (loss) on indexed debt securities | 0 | 0 | 0
Gain (loss) on ZENS-related securities | 0 | 0 | 0
Ending balance | 5 | 7 | 10
Derivative Component Of ZENS |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Beginning balance | 578 | 903 | 953
Accretion of debt component of ZENS | 0 | 0 | 0
2% interest paid | 0 | 0 | 0
Redemption of Series A Preferred Stock | 0 | 0 | 0
Gain (loss) on indexed debt securities | 27 | (325) | (50)
Gain (loss) on ZENS-related securities | 0 | 0 | 0
Ending balance | $ 605 | $ 578 | $ 903

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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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Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: | cnp_
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Balance Type: | credit
Period Type: | duration

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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
Name: | cnp_GainLossOnIndexedDebtSecurities
Namespace Prefix: | cnp_
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- References No definition available. + Details
Name: | cnp_IndexedDebtCurrent
Namespace Prefix: | cnp_
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Balance Type: | credit
Period Type: | instant

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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//1943274/2147483586/944-220-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 Amount of investment in marketable security, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + 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 No definition available. + Details
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