XML 92 R70.htm IDEA: XBRL DOCUMENT v3.24.1.u1

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

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: