XML 113 R91.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Related Party Transactions (Houston Electric and CERC) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool investments (borrowings) | $ 573 |  | $ 238
Cash dividends paid to parent | 36 | $ 51 |
Houston Electric | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Contribution from parent | 230 | 650 |
Houston Electric | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | (1) | (3) |
Houston Electric | Operation and maintenance expense | CenterPoint Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | $ 35 | 35 |
Houston Electric | Investments |  |  |
Related Party Transaction [Line Items] |  |  |
Weighted average interest rate | 5.55% |  | 5.59%
CERC |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool investments (borrowings) | $ 0 |  | $ 1
Cash dividends paid to parent | 115 | 204 |
CERC | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Contribution from parent | 0 | 0 |
CERC | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | 1 | 3 |
CERC | Operation and maintenance expense | CenterPoint Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | $ 51 | $ 50 |
CERC | Investments |  |  |
Related Party Transaction [Line Items] |  |  |
Weighted average interest rate | 0.00% |  | 5.59%

X
- Definition Contribution From Parent + References No definition available. + Details
Name: | cnp_ContributionFromParent
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Money Pool Investments (Borrowings) + References No definition available. + Details
Name: | cnp_MoneyPoolInvestmentsBorrowings
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average interest rate of outstanding investments in money pool. + References No definition available. + Details
Name: | cnp_MoneyPoolInvestmentsWeightedAverageInterestRate
Namespace Prefix: | cnp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of net service charges from (billings to) related party during the period, excluding transactions that are eliminated in consolidated or combined financial statements. + References No definition available. + Details
Name: | cnp_NetAffiliateServiceChargesBillings
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Payment Of Dividends To Parent + References No definition available. + Details
Name: | cnp_PaymentOfDividendsToParent
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-3 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
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: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=cnp_OperationAndMaintenanceExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cnp_CenterpointEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=us-gaap_InvestmentsMember
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: |