XML 245 R81.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Regulatory Matters - Narrative (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 11, 2024 MW | Mar. 06, 2024 USD ($) $ / KWH_Kilowatt_hour | Aug. 23, 2023 USD ($) | Apr. 05, 2023 USD ($) | Mar. 23, 2023 USD ($) | Dec. 31, 2021 USD ($) lease | Jan. 10, 2025 USD ($) | Dec. 31, 2024 USD ($) | Nov. 08, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 29, 2023 USD ($) | Jan. 04, 2023 USD ($) | Dec. 31, 2022 | Oct. 19, 2022 USD ($) | Jul. 01, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  | $ 239,000,000 |  | $ 161,000,000 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 3,108,000,000 |  | 2,513,000,000 |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 3,347,000,000 |  | 2,674,000,000 |  |  |  |  |
Cost of recovery for power consumption | MW | 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on investment for power consumption | MW | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  |  |  | 42,667,000,000 |  | 40,396,000,000 |  |  |  |  |
Estimated case processing expenses and carrying costs |  |  |  |  |  |  |  |  | $ 502,000,000 |  |  |  |  |  |
Operation And Maintenance Expense | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 19,000,000 |  | 17,000,000 |  |  |  |  |
Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 8,000,000 |  | 8,000,000 |  |  |  |  |
IURC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |
CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  | 238,000,000 |  | 161,000,000 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 903,000,000 |  | 850,000,000 |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 1,141,000,000 |  | 1,011,000,000 |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  |  |  | 15,552,000,000 |  | 15,672,000,000 |  |  |  |  |
CERC | CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 409,000,000 |
CERC | Minnesota Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,000,000 |
Houston Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 1,284,000,000 |  | 752,000,000 |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 1,284,000,000 |  | 752,000,000 |  |  |  |  |
Number of leases entered into | lease |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  |  |  | 21,750,000,000 |  | 19,515,000,000 |  |  |  |  |
Houston Electric | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intervenor recommended disallowances |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |
Houston Electric | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intervenor recommended disallowances |  |  |  |  |  |  | $ 101,900,000 |  |  |  |  |  |  |  |
Houston Electric | Operation And Maintenance Expense | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 19,000,000 |  | 17,000,000 |  |  |  |  |
Houston Electric | Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 8,000,000 |  | 8,000,000 |  |  |  |  |
Recovery of deferred costs sought |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount |  |  |  | $ 39,000,000 |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  | 82 months 15 days |  |  |  |  |  |  |  |  |  |  |
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  | 78 months |  |  |  |  |  |  |  |  | 102 months |  |
Regulatory asset, annual revenue requirement amount |  |  |  | $ 188,000,000 |  |  |  |  |  |  |  |  |  |  |
Annual revenue increase from lease agreements |  |  |  | $ 149,000,000 |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, revenue requirement amount reduction |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |
SIGECO | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, issued |  |  |  |  |  |  |  |  |  |  | $ 341,000,000 |  |  |  |
February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  |  |  | 86,000,000 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 67,000,000 |  | 130,000,000 |  |  |  |  |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
February 2021 Winter Storm Event | CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, approximate total gas cost |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  |  |  | 86,000,000 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 67,000,000 |  | $ 130,000,000 |  |  |  |  |
February 2021 Winter Storm Event | CERC | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  | 67,000,000 |  |  |  |  |  |  |
February 2021 Winter Storm | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, expected settlement |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in regulatory revenue |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Residential customers average usage | $ / KWH_Kilowatt_hour |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
February 2021 Winter Storm | CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Current Regulatory Assets |  |  |  |  |  |  |  | 67,000,000 |  |  |  |  |  |  |
May 2024 Storm Events | Houston Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 73,000,000 |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  |  |  | 345,000,000 |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  | 458,000,000 |  |  |  |  |  |  |
Hurricane Harvey | Houston Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Regulatory Assets |  |  |  |  |  |  |  | 442,000,000 |  |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  |  |  | 654,000,000 |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |

X
- Definition Amount Of Securitization Bonds Issued + References No definition available. + Details
Name: | cnp_AmountOfSecuritizationBondsIssued
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of Securitiztion Bonds Authorized To Issue + References No definition available. + Details
Name: | cnp_AmountOfSecuritiztionBondsAuthorizedToIssue
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash Proceeds Received From Government Grants + References No definition available. + Details
Name: | cnp_CashProceedsReceivedFromGovernmentGrants
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disallowance of Regulatory Asset + References No definition available. + Details
Name: | cnp_DisallowanceOfRegulatoryAsset
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated Storm Restoration Costs + References No definition available. + Details
Name: | cnp_EstimatedStormRestorationCosts
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Intervenor Recommended Disallowance Of Revenue Requirement + References No definition available. + Details
Name: | cnp_IntervenorRecommendedDisallowanceOfRevenueRequirement
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number Of Leases Commenced + References No definition available. + Details
Name: | cnp_NumberOfLeasesCommenced
Namespace Prefix: | cnp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Asset, Approximate Total Gas Cost + References No definition available. + Details
Name: | cnp_RegulatoryAssetApproximateTotalGasCost
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Asset, Asset Recovery Of Deferred Costs From Assessment + References No definition available. + Details
Name: | cnp_RegulatoryAssetAssetRecoveryOfDeferredCostsFromAssessment
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Asset, Cost Recovery and Return on Investment, Generating Capacity 32 Megawatt Generators + References No definition available. + Details
Name: | cnp_RegulatoryAssetCostRecoveryAndReturnOnInvestmentGeneratingCapacity32MegawattGenerators
Namespace Prefix: | cnp_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Asset, Cost Recovery and Return on Investment, Generating Capacity 5 Megawatt Generators + References No definition available. + Details
Name: | cnp_RegulatoryAssetCostRecoveryAndReturnOnInvestmentGeneratingCapacity5MegawattGenerators
Namespace Prefix: | cnp_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Asset, Expected Settlement + References No definition available. + Details
Name: | cnp_RegulatoryAssetExpectedSettlement
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Asset, Lease, Incremental Revenue Requirement Increase + References No definition available. + Details
Name: | cnp_RegulatoryAssetLeaseIncrementalRevenueRequirementIncrease
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory Asset, Reduced Revenue Requirement Amount + References No definition available. + Details
Name: | cnp_RegulatoryAssetReducedRevenueRequirementAmount
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory Asset, Residential Customers Based on Average Usage of Electric + References No definition available. + Details
Name: | cnp_RegulatoryAssetResidentialCustomersBasedOnAverageUsageOfElectric
Namespace Prefix: | cnp_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Regulatory Asset, Revenue Requirement Amount Reduction + References No definition available. + Details
Name: | cnp_RegulatoryAssetRevenueRequirementAmountReduction
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Regulatory Asset, Total Revenue Requirement Amount + References No definition available. + Details
Name: | cnp_RegulatoryAssetTotalRevenueRequirementAmount
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Storm Restoration, Case Processing Expenses and Carrying Costs + References No definition available. + Details
Name: | cnp_StormRestorationCaseProcessingExpensesAndCarryingCosts
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The increase (decrease) during the reporting period in unrecovered fuel costs for a regulated utility company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=cnp_February2021WinterStormMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=cnp_PublicUtilityCommissionOfTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=cnp_IURCMember
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: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=cnp_MinnesotaServiceTerritoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=cnp_MinnesotaPublicUtilityCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=cnp_TEEEFLeaseOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=cnp_TEEEFLeaseTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=cnp_February2021WinterStormEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=cnp_CustomerRateReliefBondFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=cnp_February2021WinterStormMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=cnp_May2024StormEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_HurricaneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |