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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return not recognized | $ 169 |  | $ 188
Allowed equity return recognized | 8 | $ 10 |
Houston Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return not recognized | 90 |  | 82
Allowed equity return recognized | 7 | 9 |
CERC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed equity return not recognized | 58 |  | $ 54
Allowed equity return recognized | $ 1 | $ 1 |

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- Definition Amount Of Allowed Equity Return Not Recognized In Period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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: |