Proceeds from divestiture Proceeds from Divestiture of Businesses Proceeds from issuance of long-term debt and capital securities, net Proceeds from Issuance of Long-Term Debt and Capital Securities, Net Total contributions expected in current year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Assets With Lease Payments Assets With Lease Payments [Member] Assets With Lease Payments Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in-Capital Additional Paid-in Capital [Member] Increase (decrease) in other accrued unbilled revenues Increase (Decrease) In Contract With Customer, Asset, Other Accrued Unbilled Receivables Increase (Decrease) In Contract With Customer, Asset, Other Accrued Unbilled Receivables Tabular List, Table Tabular List [Table Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Schedule of Estimated Fair Value of Financial Instruments, Debt Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Guarantor obligations, maximum exposure, undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Schedule of Reference Shares Schedule of Indexed Debt Securities and Marketable Securities [Table Text Block] Schedule of Indexed Debt Securities and Marketable Securities [Table Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions (Houston Electric and CERC) Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Sale of stock, consideration expected to be received on transaction Sale of Stock, Consideration Expected To Be Received on Transaction Sale of Stock, Consideration Expected To Be Received on Transaction Regulatory asset, authorized issuance costs Amount of Securitiztion Bonds Authorized To Issue Amount of Securitiztion Bonds Authorized To Issue Catastrophic Event [Axis] Catastrophic Event [Axis] Regulatory Matters Public Utilities Disclosure [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] Regulatory liabilities Disposal Group, Including Discontinued Operations, Regulatory Liabilities, Current Disposal Group, Including Discontinued Operations, Regulatory Liabilities, Current Accounts Receivable Change in Accounts Receivable [Roll Forward] Change in Accounts Receivable [Roll Forward] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Other Liabilities: Other Liabilities [Abstract] Initial forward price (in dollar per share) Sale Of Stock, Forward Sale Agreement, Net Forward Price Sale Of Stock, Forward Sale Agreement, Net Forward Price Pension and postretirement contributions Payment for Pension and Other Postretirement Benefits Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension plans Pension Plan [Member] Guarantor obligations, additional guarantee In relation to maximum exposure Guarantor Obligations, Additional Guarantee In Relation to Maximum Exposure Guarantor Obligations, Additional Guarantee In Relation to Maximum Exposure Principles of Consolidation Consolidation, Policy [Policy Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] First Mortgage Bonds 3.45% Due 2025 First Mortgage Bonds 3.45% Due 2025 [Member] First Mortgage Bonds 3.45% Due 2025 Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Net deferred gain from cash flow hedges, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Materials and supplies Disposal Group, Including Discontinued Operations, Materials and Supplies, Current Disposal Group, Including Discontinued Operations, Materials and Supplies, Current Common stock, authorized (in shares) Common Stock, Shares Authorized Issuances of Common Stock, net of issuance costs (in shares) Stock Issued During Period, Shares, New Issues Fair Value, Recurring Fair Value, Recurring [Member] Minnesota Service Territory Minnesota Service Territory [Member] Minnesota Service Territory Expenditures for Long-lived Assets Capital Expenditures for Long-Lived Assets Capital Expenditures for Long-Lived Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Acquisition and Divestiture (CenterPoint Energy and CERC) Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Accrued Unbilled Revenues Change in Other Accrued Unbilled Revenues [Roll Forward] Change in Other Accrued Unbilled Revenues [Roll Forward] Long-term Debt, Net: Long-Term Debt, Unclassified [Abstract] Period end settlement price (in shares) Period End Settlement Price, Shares Period End Settlement Price, Shares Medium Term Notes, Series F, Due 2028 Medium Term Notes, Series F, Due 2028 [Member] Medium Term Notes, Series F, Due 2028 Senior Notes Due 2028 to 2047 Senior Notes Due 2028 to 2047 [Member] Senior Notes Due 2028 to 2047 Restricted stock Restricted Stock [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Hurricane Beryl Class Action 2 Hurricane Beryl Class Action 2 [Member] Hurricane Beryl Class Action 2 Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Benefit Plan Contributions Benefit Plan Contributions [Table Text Block] Benefit Plan Contributions [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Carrying Value Investment Owned, Fair Value Accounts payable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income Before Income Taxes Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accounting and ratemaking project relief, approved capital costs Accounting and Ratemaking Project Relief, Approved Capital Costs Accounting and Ratemaking Project Relief, Approved Capital Costs Regulatory Assets [Line Items] Regulatory Asset [Line Items] Electric Electric [Member] Electric reportable segment consists of electric transmission and distribution services in the Texas Gulf Coast area and electric transmission and distribution services primarily to southwestern Indiana and includes power generation and wholesale power operations. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Net deferred gain from cash flow hedges (net of tax of $-0-, $-0-, $-0- and $1) Net deferred gain from cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Property, plant and equipment increase Property, Plant and Equipment, Gross, Period Increase (Decrease) Net income Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Letters of Credit Letter of Credit [Member] Number of individuals plaintiffs, two Loss Contingency, Number Of Individuals Plaintiffs, Two Loss Contingency, Number Of Individuals Plaintiffs, Two Property, plant and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current Document Fiscal Period Focus Document Fiscal Period Focus Increase in unrecognized tax benefits is reasonably possible as a result of a lapse in statutes Increase in Unrecognized Tax Benefits is Reasonably Possible Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type [Axis] Award Type [Axis] Parent Company Parent Company [Member] Unrecognized equity return Amount Of Allowed Equity Return Not Recognized In Period Amount Of Allowed Equity Return Not Recognized In Period Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Issuances related to benefit and investment plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Cost of recovery for non customer specific, maximum Regulatory Asset, Cost Recovery and Return on Investment, Maximum Regulatory Asset, Cost Recovery and Return on Investment, Maximum Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Regulatory Agency [Axis] Regulatory Agency [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Other Texas Lawsuits Brought By Assignee vs. Company Other Texas Lawsuits Brought By Assignee vs. Company [Member] Other Texas Lawsuits Brought By Assignee vs. Company Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Litigation Related to the February 2021 Winter Storm Event Litigation Related to the February 2021 Winter Storm Event [Member] Litigation Related to the February 2021 Winter Storm Event Transaction costs Disposal Group, Not Discontinued Operations, Transaction Costs Disposal Group, Not Discontinued Operations, Transaction Costs 2025C Bonds 2025C Bonds [Member] 2025C Bonds Estimated capital expenditure to clean ash ponds Estimated Capital Expenditure To Clean Ash Ponds Estimated Capital Expenditure to Clean Ash Ponds Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Loss on sale Gain (Loss) on Disposition of Other Assets Consideration receivable Disposal Group, Including Discontinued Operation, Consideration Receivable Disposal Group, Including Discontinued Operation, Consideration Receivable February 2021 Winter Storm Event February 2021 Winter Storm Event [Member] February 2021 Winter Storm Event Maximum transition term Disposal Group, Including Discontinued Operation, Maximum Transition Term Disposal Group, Including Discontinued Operation, Maximum Transition Term Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Loss contingency, number of insurers denial of indemnity coverage Loss Contingency, Number Of Insurers Denying Indemnity Coverage Loss Contingency, Number Of Insurers Denying Indemnity Coverage Number of days until commercial paper maturity (in days) Number Of Days Until Commercial Paper Maturity Number of days until commercial paper maturity. Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Convertible Notes Convertible Notes Payable [Member] Interest expense on Securitization Bonds Interest expense on Securitization Bonds Interest on Transition and System Restoration Bonds Interest and debt related expenses associated with transition and system restoration bonds. Intersegment revenues Revenue from Internal Customers, Intersegment Revenues Revenue from Internal Customers, Intersegment Revenues Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Transmission-related costs Storm Restoration, Transmission-Related Costs Storm Restoration, Transmission-Related Costs Fair Value Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] VIE Securitization Bonds, net Transition And System Restoration Bonds Long Term Debt Non Current Carrying value as of the balance sheet date of transition and system restoration bond debt (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Long-Term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Property, plant and equipment Property, Plant and Equipment, Gross Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Public Utility Commission Of Texas Public Utility Commission Of Texas [Member] Public Utility Commission Of Texas Other current assets and liabilities Increase (Decrease) in Other Current Assets Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Number of megawatts of mobile generation Long Term Lease, Number Of Megawatts Of Mobile Generation Long Term Lease, Number Of Megawatts Of Mobile Generation Pension and Other Postretirement Plans Costs Pension and Other Postretirement Plans Costs [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Minnesota and Indiana Minnesota and Indiana [Member] Minnesota and Indiana Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Years to resolve contingency Site Contingency, Years To Resolve Contingency This represents the estimated years necessary to resolve the contingency. Subsequent Event Subsequent Event [Member] A.B. Brown A.B. Brown Facility [Member] A.B. Brown Facility Interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Additional first mortgage bonds and general mortgage bonds that could be issued Additional first mortgage bonds and general mortgage bonds that could be issued Amount of additional first mortgage bonds and general mortgage bonds that could be issued on the basis of retired bonds and 70% of property additions as of the balance sheet date. Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Equity Components [Axis] Equity Components [Axis] Convertible Debt Convertible Debt [Member] Number of customers (more than) Disposal Group Including Discontinued Operations, Number of Customers Disposal Group Including Discontinued Operations, Number of Customers Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] General Mortgage Bonds, 2.35% to 6.95%, Due 2026 to 2053 General Mortgage Bonds, 2 Point 35 Percent to 6 Point 95 Percent, Due 2026 to 2053 [Member] General Mortgage Bonds, 2 Point 35 Percent to 6 Point 95 Percent, Due 2026 to 2053 Period end net share settlement price (in shares) Period End Net Share Settlement, Share Period End Net Share Settlement, Share Regulatory asset, approximate total gas cost Regulatory Asset, Approximate Total Gas Cost Regulatory Asset, Approximate Total Gas Cost Hurricane Beryl Personal Injury Hurricane Beryl Personal Injury [Member] Hurricane Beryl Personal Injury Regulatory liabilities Regulatory Liability, Noncurrent Entity Address, State or Province Entity Address, State or Province Common Stock dividends declared (see Note 15) Dividends, Common Stock Environmental remediation investigation studies agreed upon number of sites Environmental Remediation Investigation Studies Agreed Upon Number of Sites Environmental Remediation Investigation Studies Agreed Upon Number of Sites Total current liabilities Total current liabilities Liabilities, Current Inventory [Axis] Inventory [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Individual: Individual [Axis] Payment of dividends on Common Stock Payments of Ordinary Dividends, Common Stock Entities [Table] Entities [Table] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Payments of long-term debt and term loans, including make-whole premiums Payments of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Catastrophic Event [Domain] Catastrophic Event [Domain] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] 5.77%, Series 2025C, Tranche A Due 2040 5.77% First Mortgage Bonds, Series 2025C, Tranche A due 2040 [Member] 5.77% First Mortgage Bonds, Series 2025C, Tranche A due 2040 Schedule of Purchase Obligations Long-Term Purchase Commitment [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Contribution from parent Non-cash contribution from parent Proceeds from Contributions from Parent Lease liabilities incurred Asset Acquisition, Consideration Transferred, Lease Liabilities Incurred Asset Acquisition, Consideration Transferred, Lease Liabilities Incurred Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Current Other expense (income), net Other Miscellaneous Non Operating Income (Expense), Net Other Miscellaneous Non Operating Income (Expense), Net Utility natural gas, fuel and purchased power Utility natural gas Utilities Operating Expense, Gas and Petroleum Purchased Condensed Financial Statements [Table] Condensed Financial Statements [Table] Other non-current assets Other Assets, Noncurrent Interest accrued Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name Asset retirement obligation Asset Retirement Obligation Debt instrument, convertible, conversion price (in dollar per shares) Debt Instrument, Convertible, Conversion Price Total Revenues Revenues from external customers Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] 2027 Purchase Obligation, to be Paid, Year Two Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Other comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Customer deposits Customer deposits Contract with Customer, Liability, Current Materials and supplies Inventory, Raw Materials and Supplies, Gross Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Total consideration Disposal Group, Including Discontinued Operation, Consideration CEOH CenterPoint Energy Ohio [Member] CenterPoint Energy Ohio Total long-term debt, net Long-Term Debt, Excluding Current Maturities Nonrelated Party Nonrelated Party [Member] Indiana Gas Service Territory Indiana Gas Service Territory [Member] Represents the areas in Indiana serviced by Indiana Gas Service Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Amortization of prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Purchase price Disposal Group Including Discontinued Operations, Purchase Price of Natural Gas Disposal Group Including Discontinued Operations, Purchase Price of Natural Gas Restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Schedule of Money Pool Investment and Borrowing Schedule Of Money Pool Investment And Borrowing [Table Text Block] [Table Text Block] for Tabular disclosure the investments and borrowing within the money pool activities. Utility revenues Regulated Operating Revenue Total Costs and Expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Long-term debt, fair value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Earnings Per Common Share [Abstract] Earnings Per Common Share [Abstract] Earnings Per Common Share Counterparty Name [Domain] Counterparty Name [Domain] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Other Disposal Group, Including Discontinued Operation, Other Liabilities, Current Actuarial losses (gain) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Convertible Senior Notes, Due 2028 Convertible Senior Notes, Due 2028 [Member] Convertible Senior Notes, Due 2028 Non-PEO NEO Non-PEO NEO [Member] Reimbursement of transition services Transition Services Agreement, Charges Transition Services Agreement, Charges Allowed equity return recognized Amount Of Allowed Equity Return Recognized In Period Amount of allowed equity return on the true-up balance that was recognized in the period Interest income Interest Income, Other Sale of Stock [Axis] Sale of Stock [Axis] Award Type [Domain] Award Type [Domain] Statement of Other Comprehensive Income [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Accounts receivable and unbilled revenues, net Increase (Decrease) in Accounts and Other Receivables Compensation Amount Outstanding Recovery Compensation Amount Remainder of 2025 Purchase Obligation, to be Paid, Remainder of Fiscal Year Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Common Stock, $0.01 Par Value Common Stock, $0.01 Par Value [Member] Common Stock, $0.01 Par Value [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Consecutive period for system restoration costs to exceed $100 million (in months) Consecutive Period for System Restoration Costs to Exceed $100 million (in months) Consecutive Period for System Restoration Costs to Exceed $100 million (in months) Fair value Estimate of Fair Value Measurement [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Estimated remediation costs Site Contingency Loss Exposure Estimate of the reasonably possible loss exposure at an individual site. Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Revenues: Revenues [Abstract] Inventory [Domain] Inventory [Domain] General Mortgage Bonds General Mortgage Bonds [Member] General Mortgage Bonds Proceeds from Issuance of Subordinated Long-Term Debt Proceeds from Issuance of Subordinated Long-Term Debt Accumulated other comprehensive loss Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Long-Term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Contract Balances [Line Items] Contract Balances [Line Items] [Line Items] for Contract Balances [Table] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Reclassification of deferred gain from cash flow hedges realized in net income (net of tax of $-0-, $-0-, $-0- and $-0-) Reclassification of deferred gain from cash flow hedges realized in net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Minimum Minimum [Member] Counterparty Two Counterparty Two [Member] Counterparty Two Company Selected Measure Name Company Selected Measure Name Liability recorded for environmental loss contingencies Accrual for Environmental Loss Contingencies Fair Value Measurement [Domain] Fair Value Measurement [Domain] Short-term Borrowings and Long-term Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Period end settlement price in cash Period End Settlement Price, Cash Period End Settlement Price, Cash Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Collateral Held [Domain] Collateral Held [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Regulatory Assets [Table] Regulated Operation, Regulatory Asset [Table] Weighted Average Common Shares Outstanding, Diluted (in shares) Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted WBD Common WBD Common [Member] WBD Common Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Number of leases entered into Number Of Leases Commenced Number Of Leases Commenced Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 2029 Purchase Obligation, to be Paid, Year Four Document Transition Report Document Transition Report Long-term Debt Long-Term Debt [Member] Payment of commercial paper, net Payments of commercial paper, net Proceeds from (Repayments of) Commercial Paper Underlying Securities Award Underlying Securities Amount Remeasurement of pension and other postretirement plans Other Comprehensive Income (Loss), before Reclassifications, before Tax Restricted Cash and Cash Equivalent, Statement of Financial Position [Extensible Enumeration] Restricted Cash and Cash Equivalent, Statement of Financial Position [Extensible Enumeration] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Income Taxes Income Tax Disclosure [Text Block] Regulatory assets Disposal Group, Including Discontinued Operations, Regulatory Assets, Current Disposal Group, Including Discontinued Operations, Regulatory Assets, Current Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Minnesota and Indiana Gas Service Territories Minnesota and Indiana Gas Service Territories [Member] Minnesota and Indiana Gas Service Territories Affiliate service charges (billings), net Net Affiliate Service Charges (Billings) Amount of net service charges from (billings to) related party during the period, excluding transactions that are eliminated in consolidated or combined financial statements. Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share (CenterPoint Energy) Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Litigation Status [Domain] Litigation Status [Domain] Consideration transferred Asset Acquisition, Consideration Transferred Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Senior Notes Due 2026 to 2031 Senior Notes Due 2026 to 2031 [Member] Senior Notes Due 2026 to 2031 Disposal Group Name [Axis] Disposal Group Name [Axis] Interest expense and other finance charges Interest and Debt Expense and Other Charges Interest and Debt Expense and Other Charges Other Pension, Postretirement and Supplemental Plans Other Pension, Postretirement and Supplemental Plans [Member] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Indiana Electric Indiana Electric [Member] Operations of SIGECO's electric transmission and distribution services, including power generation and wholesale power operations. [Member] Investment in equity securities Marketable Securities, Current Louisiana and Mississippi Regulated Natural Gas LDC Businesses Louisiana and Mississippi Regulated Natural Gas LDC Businesses [Member] Louisiana and Mississippi Regulated Natural Gas LDC Businesses Regulatory assets Regulatory Asset, Current Entity Information [Line Items] Entity Information [Line Items] Reduction in transmission-related costs Storm Restoration, Reduction In Transmission-Related Costs Storm Restoration, Reduction In Transmission-Related Costs Current Liabilities: Liabilities, Current [Abstract] Total Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Long term lease, number of small power generating units Long Term Lease, Number Of Small Power Generating Units Long Term Lease, Number Of Small Power Generating Units Weighted average interest rate Money Pool Investments Weighted Average Interest Rate Weighted average interest rate of outstanding investments in money pool. Long-term line of credit Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Other Assets: Other Assets [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Diluted Earnings Per Common Share (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Accounts receivable, less allowance for credit losses Accounts Receivable, after Allowance for Credit Loss, Current Securitiztion bonds interest rate (in percent) Securitiztion Bonds Authorized To Issue, Interest Rate, Percent Securitiztion Bonds Authorized To Issue, Interest Rate, Percent Gain (loss) on indexed debt securities Gain (loss) On Indexed Debt Securities This item represents the net total realized and unrealized gain (loss) included in earnings for the period related to indexed debt securities. Hurricane Beryl Hurricane [Member] Junior Notes Junior Notes [Member] Consolidation Items [Domain] Consolidation Items [Domain] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Subordinated borrowing, interest rate Subordinated Borrowing, Interest Rate Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Cash proceeds received from government grants Cash Proceeds Received From Government Grants Cash Proceeds Received From Government Grants Accrued unbilled revenues Disposal Group, Including Discontinued Operations, Contract With Customer, Asset, Current Disposal Group, Including Discontinued Operations, Contract With Customer, Asset, Current Loss contingency, number of defendants Loss Contingency, Number of Defendants Income tax payments (refunds), net Cash paid (refunds received) for income taxes, net Income Taxes Paid, Net Current assets held for sale Total current assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Outstanding debt balance Long-Term Debt, Gross IURC IURC [Member] IURC Accounts receivable–affiliated companies Accounts and Notes Receivable, Current Accounts and Notes Receivable, Current Subsidiaries Subsidiaries [Member] Accounts receivable/payable–affiliated companies Increase (Decrease) in Accounts Receivable (Payable) Affiliates The increase (decrease) in net accounts receivables and payables due to/from affiliates. Balance of investment owned (in shares) Investment Owned, Balance, Shares Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Tom Green County Tom Green County [Member] Tom Green County Decrease in short-term borrowings, net Proceeds from (Repayments of) Other Debt Corporate service charges Related Party Transaction, Amounts of Transaction Subordinated Debt, ZENS, Due 2029 Subordinated Debt, ZENS, Due 2029 [Member] Issued debt obligation as zero-premium exchangeable subordinated notes. Obligation is bifurcated between a debt component and an embedded derivative component. Exchangeable for cash at any time at the option of the holder, and as such are classified as a current portion of long-term debt. Property, plant and equipment, net Property, Plant and Equipment, Net Investments Investments [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Collateral Held [Axis] Collateral Held [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Vectren Energy Delivery of Ohio, LLC Vectren Energy Delivery of Ohio, LLC [Member] Vectren Energy Delivery of Ohio, LLC Bellwether Cases Bellwether Cases [Member] Bellwether Cases Proceeds from long-term debt and term loans, net Proceeds from Issuance of Long-Term Debt Total other assets Total other assets Assets Non current Other Than Property Plant And Equipment Sum of the carrying amounts as of the balance sheet date of assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer, excluding property, plant and equipment. Comprehensive income Comprehensive Income (Loss), Net Of Tax, Before Preferred Stock Dividends Total comprehensive income before preferred stock dividend requirements. Current Fiscal Year End Date Current Fiscal Year End Date Posey Solar Posey Solar [Member] Posey Solar Amount of cancelled debt Debt Instrument, Amount Of Debt Cancelled Debt Instrument, Amount Of Debt Cancelled Derivative liability Derivative Liability Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Schedule of Estimated Accrued Costs Schedule of Environmental Loss Contingencies by Site [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Miles of pipeline (in miles) Disposal Group Including Discontinued Operations, Length of Pipeline Disposal Group Including Discontinued Operations, Length of Pipeline Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) Indexed Debt Securities [Text Block] This item represents the entire disclosure related to Indexed Debt Securities (ZENS) and Time Warner Securities. Other Commitments [Table] Other Commitments [Table] F.B. Culley F.B. Culley Facility [Member] F.B. Culley Facility Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Energy Rental Solutions Energy Rental Solutions [Member] Energy Rental Solutions Operation and maintenance Operation and maintenance Operation and maintenance expenses Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Environmental remediation, number of sites sites owned or operated by bormer affiliate Environmental Remediation, Number of Sites Sites Owned or Operated By Former Affiliate Environmental Remediation, Number of Sites Sites Owned or Operated By Former Affiliate Non-utility cost of revenues, including natural gas Non-utility cost of revenues, including natural gas Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Forward purchasing contract, number of shares (in shares) Forward Contract Indexed to Issuer's Equity, Shares Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Entity Tax Identification Number Entity Tax Identification Number Asset Acquisition [Axis] Asset Acquisition [Axis] Interest income from securitization bonds (less than for 2025) Interest Income From Securitization Bonds Interest Income From Securitization Bonds Total other liabilities Liabilities, Other than Long-Term Debt, Noncurrent Target annual yield on reference shares (as a percent) Target Annual Yield On Reference Shares The target annual yield from interest and cash dividends on reference shares, before any adjustment to increase or decrease principal amount of subordinated note is made. Dividends accrued Dividends Payable, Current Interest expense and other finance charges Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Security Exchange Name Security Exchange Name 6.18%, Series 2025C, Tranche B Due 2055 6.18% First Mortgage Bonds, Series 2025C, Tranche B due 2055 [Member] 6.18% First Mortgage Bonds, Series 2025C, Tranche B due 2055 Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Intervenor disallowance positions cost Disaster Recovery Expense, Disallowed Amount Disaster Recovery Expense, Disallowed Amount Accounts payable related to capital expenditures Capital Expenditures Incurred but Not yet Paid Size of Facility Line of Credit Facility, Maximum Borrowing Capacity Other current liabilities Other Liabilities, Current Percentage of posey solar assets acquired Asset Acquisition, Percentage Of Assets Acquired Asset Acquisition, Percentage Of Assets Acquired Benefit obligations Liability, Defined Benefit Plan, Noncurrent Statement [Line Items] Statement [Line Items] Distribution-related costs Storm Restoration, Distribution-Related Costs Storm Restoration, Distribution-Related Costs Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Natural gas inventory Disposal Group, Including Discontinued Operation, Inventory, Current Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Common Stock dividends paid per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Statistical Measurement [Domain] Statistical Measurement [Domain] Customer deposits Disposal Group, Including Discontinued Operations, Customer Deposits, Current Disposal Group, Including Discontinued Operations, Customer Deposits, Current Related Party Transaction [Axis] Related Party Transaction [Axis] Harris County Harris County [Member] Harris County Opening balance as of December 31, 2024 Closing balance as of September 30, 2025 Unbilled Contracts Receivable Schedule of Dividends Declared And Paid Dividends Declared [Table Text Block] Accounts payable Increase (Decrease) in Accounts Payable Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic Earnings Per Common Share (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Commercial Paper Commercial Paper [Member] Reclassification of deferred gain from cash flow hedges realized in net income net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss) Realized In Net Income, Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss) Realized In Net Income, Reclassification, Tax Liabilities Liabilities, Fair Value Disclosure [Abstract] Current regulatory assets and liabilities Increase (Decrease) in Regulatory Assets and Liabilities Current Increase (Decrease) in Regulatory Assets and Liabilities Current Alternative Energy Alternative Energy [Member] Environmental remediation number of sites with potential remedial responsibility Environmental remediation number of sites with potential remedial responsibility Number of sites identified where the entity may potentially have some remedial responsibility Accrued unbilled revenue, less allowance for credit losses Unbilled Receivables, Current Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term borrowings Short-Term Debt Conversion price percentage Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Cases Transferred to the Multi District Litigation (MDL) Cases Transferred to the Multi District Litigation (MDL) [Member] Cases Transferred to the Multi District Litigation (MDL) Affiliated Entity Affiliated Entity [Member] Indexed debt securities derivative Indexed debt securities derivative 4.95%, General Mortgage Bonds, Series AQ, due 2035 4.95%, General Mortgage Bonds, Series AQ, Due 2035 [Member] 4.95%, General Mortgage Bonds, Series AQ, Due 2035 Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Variable Interest Entity, Primary Beneficiary VIEs Variable Interest Entity, Primary Beneficiary [Member] Secured debt Secured Debt Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Current Assets: Assets, Current [Abstract] Total Liabilities and Shareholders’ Equity Liabilities and Equity Termination period Transition Services Agreement, Required Termination Notice Period Transition Services Agreement, Required Termination Notice Period Common Stock [Abstract] Stockholders' Equity, Number of Shares, Par Value and Other Disclosure [Abstract] 2028 Purchase Obligation, to be Paid, Year Three 5.52%, Series 2025B, Tranche A Due 2035 5.52% First Mortgage Bonds, Series 2025B, Tranche B due 2035 [Member] 5.52% First Mortgage Bonds, Series 2025B, Tranche B due 2035 5.09%, Series 2025B, Tranche A Due 2031 5.09% First Mortgage Bonds, Series 2025B, Tranche A due 2031 [Member] 5.09% First Mortgage Bonds, Series 2025B, Tranche A due 2031 Number of claims dismissed Loss Contingency, Claims Dismissed, Number Pay vs Performance Disclosure [Line Items] Houston Electric Houston Electric [Member] Houston Electric [Member] Total liabilities Financial Liabilities Fair Value Disclosure Expenses associated with long term lease Long Term Lease, Expense, Deferred Regulatory Asset Long Term Lease, Expense, Deferred Regulatory Asset Debt instrument, redemption price, percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Other non-current liabilities Other Liabilities, Noncurrent Reduction in distribution-related costs Storm Restoration, Reduction In Distribution-Related Costs Storm Restoration, Reduction In Distribution-Related Costs Louisiana And Mississippi Natural Gas LDC Businesses Louisiana And Mississippi Natural Gas LDC Businesses [Member] Louisiana And Mississippi Natural Gas LDC Businesses Counterparty One Counterparty One [Member] Counterparty One Reduction in cost Storm Restoration, Reduction In Cost Storm Restoration, Reduction In Cost Long-term debt, current maturities Long-Term Debt, Current Maturities Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Total contributions to the plans during the period Defined Benefit Plan, Plan Assets, Contributions by Employer Loss contingency, claims settled, number Loss Contingency, Claims Settled, Number Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Class of Stock [Line Items] Class of Stock [Line Items] Deferred income taxes, net Deferred Income Tax Liabilities, Net Number of owned coal ash ponds Number of Owned Coal Ash Ponds Number of Owned Coal Ash Ponds Number of shares referenced in exchangeable subordinated note (in shares) Number Of Shares Referenced In Exchangeable Subordinated Note Number of shares attributable to each note and referenced in determining the fair value of the cash to be exchange at behest of note holder. Income Tax Contingency [Table] Income Tax Contingency [Table] Estimated case processing expenses and carrying costs Storm Restoration, Case Processing Expenses and Carrying Costs Storm Restoration, Case Processing Expenses and Carrying Costs Legal Entity [Axis] Legal Entity [Axis] Schedule of Allowed Equity Return Not Recognized Allowed Equity Return Not Recognized [Table Text Block] Allowed Equity Return Not Recognized Total Assets Total Assets Assets Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] CenterPoint Energy And Houston Electric Entities CenterPoint Energy And Houston Electric Entities [Member] CenterPoint Energy And Houston Electric Entities Cash and Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Geographical [Domain] Geographical [Domain] CenterPoint Energy and CERC CenterPoint Energy And CERC [Member] CenterPoint Energy And CERC SIGECO SIGECO [Member] SIGECO [Member] AT&T Common AT&T Common [Member] Common stock of AT&T Inc. Percentage of property additions (as a percent) Percentage Of Property Additions Percentage Of Property Additions Gross sales price Forward Sale Agreement Gross Sales Price Forward Sale Agreement Gross Sales Price Jefferson Parish and the State of Louisiana Under the SCLRMA Jefferson Parish and the State of Louisiana Under the SCLRMA [Member] Jefferson Parish and the State of Louisiana Under the SCLRMA Loss contingency, pending claims, number of lawsuits named as defendant Loss Contingency, Pending Claims, Number of Lawsuits Named as Defendant Loss Contingency, Pending Claims, Number of Lawsuits Named as Defendant Chevron Corporation Chevron Corporation [Member] Chevron Corporation Assets Assets, Fair Value Disclosure [Abstract] Predecessor Company, Primary Fuels, Inc. Predecessor Company, Primary Fuels, Inc. [Member] Predecessor Company, Primary Fuels, Inc. Common stock, dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding ROU assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 6.625% Senior Notes due 2037 6.625% Senior Notes due 2037 [Member] 6.625% Senior Notes due 2037 [Member] Number of business days Debt Instrument, Debt Maturity Selection, Number Of Business Days For Advance Notice Debt Instrument, Debt Maturity Selection, Number Of Business Days For Advance Notice Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Increase (decrease) in accounts receivable Increase (Decrease) In Accounts Receivable On Contracts With Customers Increase (Decrease) In Accounts Receivable On Contracts With Customers Loss on sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Debt instrument, convertible, number of equity instruments (in shares) Debt Instrument, Convertible, Number of Equity Instruments Number of individuals plaintiffs, one Loss Contingency, Number Of Individuals Plaintiffs, One Loss Contingency, Number Of Individuals Plaintiffs, One PEO PEO [Member] CES CES [Member] CES Pending lawsuits Loss Contingency, Pending Claims, Number Contract Balances [Table] Contract Balances [Table] Contract Balances [Table] Supplemental Disclosure of Non-cash Transactions Noncash Investing and Financing Items [Abstract] (Increase) decrease in notes receivable–affiliated companies Decrease in notes receivable–affiliated companies Increase (Decrease) in Notes Receivable, Related Parties Corporate and Other Corporate Segment and Other Operating Segment [Member] Changes in other assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Increase in notes payable–affiliated companies Increase (Decrease) in Notes Payable, Related Parties Retained Earnings Retained Earnings [Member] Cash, Cash Equivalents and Restricted Cash at Beginning of Period Cash, Cash Equivalents and Restricted Cash at End of Period Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Thereafter Purchase Obligation, to be Paid, after Year Five Sale of Stock [Domain] Sale of Stock [Domain] Taxes accrued Taxes Payable, Current Investments, including money market funds Investments, Fair Value Disclosure F.B. Culley East F.B. Culley East [Member] F.B. Culley East Product and Service [Domain] Product and Service [Domain] Regulatory asset, issued Amount Of Securitization Bonds Issued Amount Of Securitization Bonds Issued Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Payment for asset acquisition Payments to Acquire Other Productive Assets City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Compensation received by counterparty Forward Sale Agreement, Compensation Received by Counterparty Forward Sale Agreement, Compensation Received by Counterparty Loss from Catastrophes Loss from Catastrophes [Member] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Storm restoration, costs for legal expenses Storm Restoration, Costs For Legal Expenses Storm Restoration, Costs For Legal Expenses Power generation capacity, megawatts Asset Acquisition, Power Generation Capacity Acquired Asset Acquisition, Power Generation Capacity Acquired Schedule of Contract with Customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Series 2025B Bonds Series 2025B Bonds [Member] Series 2025B Bonds Chicago Stock Exchange NYSE Chicago [Member] NYSE Chicago Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Natural Gas Supply Natural Gas [Member] Equity securities Equity Securities, FV-NI Goodwill Goodwill Potential disallowance of recovery of costs Loss Contingency, Estimate of Possible Loss Operation and maintenance expense Operation And Maintenance Expense [Member] Amount of share-based compensation cost reported in the period, allocated to operations and maintenance expense. Operations and maintenance expense are the costs associated with normal operations, including general and administrative expenses, and routine plant maintenance and repairs. Other long-term debt, net Other Long-Term Debt, Noncurrent New York Stock Exchange New York Stock Exchange [Member] New York Stock Exchange [Member] Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Payment of debt issuance costs Payments of Debt Issuance Costs Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Equity forwards Equity Forward Sales [Member] Equity Forward Sales Net Increase in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Storm restoration, costs for printing materials Storm Restoration, Costs For Printing Materials Storm Restoration, Costs For Printing Materials Gain (loss) on equity securities Loss (gain) on equity securities Total gains (losses) on equity securities, net Equity Securities, FV-NI, Gain (Loss) Litigation Status [Axis] Litigation Status [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] CenterPoint Energy CenterPoint Energy [Member] Another company which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Other current assets and liabilities Increase (Decrease) in Other Current Assets and Liabilities, Net Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] 2026 Purchase Obligation, to be Paid, Year One Loss on sale Gain on sale Gain (loss) on sale Gain (Loss) on Disposition of Business Cash paid for interest, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Period end net cash settlement price Period End Net Cash Settlement Price Period End Net Cash Settlement Price Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Medium Term Notes, Series E, Due 2025 Medium Term Notes, Series E, Due 2025 [Member] Medium Term Notes, Series E, Due 2025 Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Carrying amount Reported Value Measurement [Member] Removal of municipal legal fees and consulting and non-consulting fees Storm Restoration, Removal Of Municipal Legal Fees and Consulting And Non-Consulting Fees Storm Restoration, Removal Of Municipal Legal Fees and Consulting And Non-Consulting Fees Loss contingency, number of lawsuits progressed to state court Loss Contingency, Number of Lawsuits Progressed To State Court Loss Contingency, Number of Lawsuits Progressed To State Court Sale of stock, capacity available under program Sale of Stock, Additional Consideration Capacity Available Sale of Stock, Additional Consideration Capacity Available Taxes other than income taxes Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Shareholders’ Equity: Member’s Equity: Equity [Abstract] Total Purchase Obligation Reportable Segments Segment Reporting Disclosure [Text Block] Current portion of VIE Securitization Bonds long-term debt Transition And System Restoration Bonds Long Term Debt Current Long-term transition and system restoration bonds are securitization bonds issued to recover qualified stranded costs and qualified storm recovery costs. This represents the current portion. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Cash consideration Disposal Group, Including Discontinued Operation, Consideration, Cash Disposal Group, Including Discontinued Operation, Consideration, Cash Cost of recovery for non customer specific, minimum Regulatory Asset, Cost Recovery and Return on Investment, Minimum Regulatory Asset, Cost Recovery and Return on Investment, Minimum Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Assets Measured on Recurring Basis [Table] Fair Value Assets And 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Software Convertible notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Anticipated future transaction one (or more) Regulatory Asset, Cost Recovery and Return on Investment, Anticipated Future Transaction Regulatory Asset, Cost Recovery and Return on Investment, Anticipated Future Transaction Loans Revolving Credit Facility [Member] Non-utility revenues Unregulated Operating Revenue Arrangement Duration Trading Arrangement Duration Schedule of Securities Classified as Trading Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations [Member] Segments [Axis] Segments [Axis] Indexed debt, net Indexed Debt Current Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other investing activities, net 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Credit Facility [Domain] ZENS annual interest rate (as a percent) Annual interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Schedule of Amount Allowed Equity Return Recognized in Period Schedule Of Allowed Equity Return Recognized [Table Text Block] Schedule Of Allowed Equity Return Recognized Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Property, Plant and Equipment, Net: Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Opening balance as of December 31, 2024 Closing balance as of September 30, 2025 Accounts Receivable For Contracts With Customers Accounts Receivable For Contracts With Customers Other non-current assets and liabilities Increase (Decrease) in Other Noncurrent Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic cost (benefit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Restoration cost expected cost Restoration Cost Expected Cost The minimum amount of estimated restoration cost in a calendar year in order for a temporary increase in debt to EBITDA covenant Jefferson Parish Jefferson Parish [Member] Jefferson Parish Regulated Operations [Abstract] Total assets Assets, Fair Value Disclosure Ratio of indebtedness to net capital (as a percent) Ratio of Indebtedness to Net Capital Multi District Litigation Multi District Litigation (MDL) [Member] Multi District Litigation (MDL) Contingent principal amount of ZENS Debt Instrument Contingent Principal Amount Outstanding Amount of outstanding contingent principal under the zero premium exchangeable subordinated notes contract contingent principal clause. 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Derivative Contract Type [Domain] Derivative Contract [Domain] Proceeds from issuance of Common Stock, net Proceeds from Issuance of Common Stock All Individuals All Individuals [Member] Threatened Litigation Threatened Litigation [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Regulatory Agency [Domain] Regulatory Agency [Domain] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Reset debt interest rate (in percent) Reset Debt Interest Rate Reset Debt Interest Rate Weighted Average Interest Rate Debt, Weighted Average Interest Rate Undiscounted minimum payment obligation, term (in years) Unrecorded Unconditional Purchase Obligation, Term Electric Supply Electric Supply [Member] Electric Supply Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Adjustment to pension and other postretirement plans (net of tax of $-0-, $-0-, $-0- and $-0-) Adjustment to pension and other postretirement plans (net of tax of $-0-, $-0-, $-0- and $-0-) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Forecast Forecast [Member] Return on investment for power consumption Regulatory Asset, Cost Recovery and Return on Investment, Generating Capacity 5 Megawatt Generators Regulatory Asset, Cost Recovery and Return on Investment, Generating Capacity 5 Megawatt Generators Amortization term (in years) Regulatory Assets And Liabilities, Amortization Term Regulatory Assets And Liabilities, Amortization Term Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Number of plaintiffs Loss Contingency, Number of Plaintiffs Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Goodwill Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Number of classes of electric and natural gas customers Number Of Classes of Electric and Natural Gas Customers Number Of Classes of Electric and Natural Gas Customers Earnings Per Share [Abstract] Total Total Nonoperating Income (Expense) Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) Percentage On Limitation Of Debt To Total Capitalization Under Covenant Amended Temporary increased percentage on limitation of debt to total capitalization under covenant (in hundredths) Sale of disposal Disposal Group Including Discontinued Operations, Sale of Natural Gas Disposal Group Including Discontinued Operations, Sale of Natural Gas Non-current regulatory assets and liabilities Increase (Decrease) in Regulatory Assets and Liabilities Non-Current Increase (Decrease) in Regulatory Assets and Liabilities Non-Current Transition services receivables Transition Services Agreement, Accounts Receivable Transition Services Agreement, Accounts Receivable Senior Notes Due 2030 to 2049 Senior Notes Due 2030 to 2049 [Member] Senior Notes Due 2030 to 2049 At The Market At The Market [Member] At The Market Series 2025C Bonds Series 2025C Bonds [Member] Series 2025C Bonds Loss contingency, number of insurers Loss Contingency, Number of Insurers Loss Contingency, Number of Insurers Award Timing Disclosures [Line Items] February 2021 Winter Storm February 2021 Winter Storm [Member] February 2021 Winter Storm Service cost Defined Benefit Plan, Service Cost Schedule of Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Measurement Frequency [Domain] Measurement Frequency [Domain] Gain on extinguishment of debt to be deferred Gain (Loss) On Extinguishment Of Debt To Be Deferred Gain (Loss) On Extinguishment Of Debt To Be Deferred February 2021 Putative Class Action February 2021 Putative Class Action [Member] February 2021 Putative Class Action Equity Equity [Text Block] Deferred tax, state, benefit Deferred State and Local Income Tax Expense (Benefit) Net Income Net Income Net income Net income (loss) Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Pending Litigation Pending Litigation [Member] Forward sale agreements percent Sale Of Stock, Forward Sale Agreements Percent Sale Of Stock, Forward Sale Agreements Percent Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Natural Gas Natural Gas Segment [Member] Segment information for the Natural Gas segment which consists of intrastate natural gas sales to, and natural gas transportation and distribution for, residential, commercial, industrial and institutional customers. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Credit agreement term (in years) Debt Instrument, Extension Term Debt Instrument, Extension Term Operating lease, term of contract (in months) Lessee, Operating Lease, Term of Contract Eliminations Consolidation, Eliminations [Member] Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Operating Income Operating Income (Loss) Hurricane Beryl Class Action 3 Hurricane Beryl Class Action 3 [Member] Hurricane Beryl Class Action 3 Line of Credit Line of Credit [Member] Retained earnings Retained earnings Retained Earnings (Accumulated Deficit) Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] 6.95% General Mortgage Bonds due 2033 6.95% General Mortgage Bonds due 2033 [Member] 6.95% General Mortgage Bonds due 2033 [Member] Class of Stock [Axis] Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Current liabilities held for sale Total current liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Other income, net Other income, net Other income, net Other Nonoperating Income (Expense) CERC CERC Corp [Member] Another company which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Background and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other Other Revenue Excluding Assessed Tax Amount, excluding tax collected from customer, of alternative revenue programs and leases revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. All Adjustments to Compensation All Adjustments to Compensation [Member] May 2024 Storm Events May 2024 Storm Events [Member] May 2024 Storm Events Amendment Flag Amendment Flag Sale of stock (in dollars per share) Sale of Stock, Price Per Share Postretirement benefit plans Other Postretirement Benefits Plan [Member] Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] General Mortgage Bonds 5.15% Due 2034 General Mortgage Bonds, Series AP, 5 Point 80 Percent, Due 2030 [Member] General Mortgage Bonds, Series AP, 5 Point 80 Percent, Due 2030 Percentage on limitation of debt to total capitalization under covenant (as a percent) Percentage on limitation of debt to total capitalization under covenant (in hundredths) Percentage on limitation of debt to total capitalization under covenant. Principal amount repurchased Debt Instrument, Redemption Price, Principal Amount Repurchased Debt Instrument, Redemption Price, Principal Amount Repurchased Interest and penalties on uncertain tax liability Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Weighted Average Common Shares Outstanding, Basic (in shares) Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Accounts payable–affiliated companies Accounts payable–affiliated companies Accounts and Notes Payable, Current Accounts and Notes Payable, Current Schedule of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Expenses associated with short-term lease Short Term Lease, Expenses, Deferred To Regulatory Asset Short Term Lease, Expenses, Deferred To Regulatory Asset Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Other Income (Expense): Other Income (Expense): Other Income (Expense): Nonoperating Income (Expense) [Abstract] Scenario [Domain] Scenario [Domain] Expenses: Expenses: Expenses: Costs and Expenses [Abstract] Dividend to parent Dividends, Cash Senior Notes Due 2044 to 2049 Senior Notes Due 2044 to 2049 [Member] Senior Notes Due 2044 to 2049 Entitled to recover a total Storm Restoration, Aggregate Cost Recovery Storm Restoration, Aggregate Cost Recovery Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] Loss (gain) on indexed debt securities Indexed Debt Securities, Gain (Loss) This item represents the net total realized and unrealized gain (loss) included in earnings for the period related to indexed debt securities. Taxes receivable Income Taxes Receivable, Current Receivables, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Subordinated note cash exchangeable percentage of fair value (as a percent) Subordinated Note Cash Exchangeable Percentage Of Fair Value The percentage of the fair value of the referenced TW Common shares attributable to each note and the percentage of composite fair value each note can be exchanged for cash. Regulatory assets Regulatory Asset Dividends to parent Payments of Dividends Customer Rate Relief Bond Financing Customer Rate Relief Bond Financing [Member] Customer Rate Relief Bond Financing Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Current portion of other long-term debt Other Long-Term Debt, Current Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Issuances of Common Stock, net of issuance costs Stock Issued During Period, Value, New Issues Regulatory asset, authorized issuance costs Amount of Securitization Bonds Authorized To Issue Amount of Securitization Bonds Authorized To Issue Cash tender offers Debt Instrument, Cash Tender Offer, Purchase Amount Debt Instrument, Cash Tender Offer, Purchase Amount 5.69% First Mortgage Bonds, Series 2025A 5.69% First Mortgage Bonds, Series 2025A [Member] 5.69% First Mortgage Bonds, Series 2025A Consolidation Items [Axis] Consolidation Items [Axis] Natural gas and coal inventory Natural gas inventory Energy Related Inventory, Natural Gas in Storage Counterparty Name [Axis] Counterparty Name [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]