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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | $ 204 |  | $ 204
Allowed equity return recognized | 9 | $ 8 |
Houston Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | 69 |  | 75
Allowed equity return recognized | 8 | 7 |
CERC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | 73 |  | $ 69
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
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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
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |