XML 99 R64.htm IDEA: XBRL DOCUMENT
v3.25.1

Regulatory Matters - Schedule of Allowed Equity Return (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | $ 276 |  | $ 251
Allowed equity return recognized | 2 | $ 9 |
Houston Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | 114 |  | 94
Allowed equity return recognized | 1 | 8 |
CERC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Unrecognized equity return | 97 |  | $ 92
Allowed equity return recognized | $ 1 | $ 1 |

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

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

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

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

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