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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return recognized | $ 41 | $ 45 | $ 40
Houston Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return recognized | 38 | 42 | 37
CERC Corp |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return recognized | $ 2 | $ 2 | $ 2

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- Definition Amount of allowed equity return on the true-up balance that was recognized in the period + References No definition available. + Details
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Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=cnp_HoustonElectricMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=cnp_CercCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |