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Reportable Segments - Schedule of Interest Income and Expenditures for Long-Lived Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Expenditures for Long-lived Assets | $ 4,649 | $ 4,370 | $ 4,418
Houston Electric |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 16 | 14 | 3
Expenditures for Long-lived Assets | 2,738 | 2,309 | 2,302
CERC |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 2 | 10 | 3
Expenditures for Long-lived Assets | $ 1,485 | $ 1,568 | $ 1,616

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- Definition Capital Expenditures for Long-Lived Assets + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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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: |