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Reportable Segments - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |
Expenditures for Long-lived Assets | $ 3,730 | $ 2,766
Houston Electric |  |
Segment Reporting Information [Line Items] |  |
Expenditures for Long-lived Assets | 1,900 | 1,400
CERC |  |
Segment Reporting Information [Line Items] |  |
Expenditures for Long-lived Assets | $ 1,100 | $ 1,100

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- Definition Capital Expenditures for Long-Lived Assets + References No definition available. + Details
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Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_SegmentReportingInformationLineItems
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: |