Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] SIGECO First Mortgage Bonds Due 2030 SIGECO First Mortgage Bonds Due 2030 [Member] SIGECO First Mortgage Bonds Due 2030 Aggregate principal amount Line of Credit Facility, Maximum Borrowing Capacity Changes in other assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Regulatory Matters Public Utilities Disclosure [Text Block] Award Type [Domain] Award Type [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] 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 Proceeds from issuance of long-term debt and capital securities, net Proceeds from Issuance of Long-Term Debt and Capital Securities, Net Schedule of Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Pension contributions Payment for Pension Benefits Deferred income taxes, net Deferred Income Tax Liabilities, Net Schedule of Indexed Debt Securities and Marketable Securities Schedule of Indexed Debt Securities and Marketable Securities [Table Text Block] Schedule of Indexed Debt Securities and Marketable Securities [Table Text Block] Lease income Lease Income Insider Trading Policies and Procedures [Line Items] Regulatory asset, authorized issuance costs Amount of Securitiztion Bonds Authorized To Issue Amount of Securitiztion Bonds Authorized To Issue Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Non-trading derivative assets Derivative Asset, Current Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Five Accounts Receivable Change in Accounts Receivable [Roll Forward] Change in Accounts Receivable [Roll Forward] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Equity Equity [Text Block] Other non-current assets and liabilities Increase (Decrease) in Other Noncurrent Assets Schedule of Other Information Related To Leases Other Information Related To Leases [Table Text Block] Other Information Related To Leases [Table Text Block] Common Stock [Abstract] Stockholders' Equity, Number of Shares, Par Value and Other Disclosure [Abstract] Operating lease income Operating Lease, Lease Income, Lease Payments Total liabilities Financial Liabilities Fair Value Disclosure Major Customers [Axis] Customer [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Current Liabilities: Liabilities, Current [Abstract] Solar array assets, useful life Solar Array Assets, Useful Life Solar Array Assets, Useful Life Accumulated goodwill impairment charge Goodwill, Impaired, Accumulated Impairment Loss Cumulative preferred stock Preferred stock Preferred Stock, Value, Issued Subsequent Event Type [Domain] Subsequent Event Type [Domain] Proceeds from divestitures, net of cash divested Proceeds from Divestiture of Businesses Dividend to parent Dividends, Cash Payment of dividends on Common Stock Payments of Ordinary Dividends, Common Stock Diluted Earnings Per Common Share (in dollars per share) Earnings Per Share, Diluted Accounts receivable, less allowance for credit losses Accounts Receivable, after Allowance for Credit Loss, Current Reclassification of deferred loss from cash flow hedges realized in net income (net of tax of $-0-, $-0-, $-0- and $-0-) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Line of Credit Line of Credit [Member] Interest expense and other finance charges Interest expense and other finance charges Interest expense and other finance charges Interest and Debt Expense Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Remeasurement of pension and other postretirement plans Other Comprehensive Income (Loss), before Reclassifications, before Tax Minnesota Service Territory Minnesota Service Territory [Member] Minnesota Service Territory Litigation Case [Axis] Litigation Case [Axis] Trading Symbol Trading Symbol Other Accrued Unbilled Revenues Change in Other Accrued Unbilled Revenues [Roll Forward] Change in Other Accrued Unbilled Revenues [Roll Forward] Taxes receivable Increase (Decrease) in Income Taxes Receivable Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Schedule of Benefit Plan Contributions Benefit Plan Contributions [Table Text Block] Benefit Plan Contributions [Table Text Block] Total lease payments to be received Lessor, Operating Lease, Payment to be Received Opening balance as of December 31, 2022 Closing balance as of September 30, 2023 Contract with Customer, Liability Other Other Intangible Assets [Member] Other Assets: Other Assets [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Service cost Defined Benefit Plan, Service Cost Executive Category: Executive Category [Axis] 2027 Lessor, Operating Lease, Payment to be Received, Year Four 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. Level 1 Fair Value, Inputs, Level 1 [Member] Adjustment to pension and other postretirement plans (net of tax expense (benefit) of $-0-, $(9), $-0- and $(5)) 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 Investment in equity securities Marketable Securities, Current Carrying amount Reported Value Measurement [Member] Guarantor obligations, maximum exposure, undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Equity Components [Axis] Equity Components [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Net assets acquired in the Restructuring Contribution From Parent For Restructuring Activities Contribution From Parent For Restructuring Activities Hedging Relationship [Domain] Hedging Relationship [Domain] Investment Type [Axis] Investment Type [Axis] 5-Year Rate Forward Interest Rate Agreement Two [Member] Forward Interest Rate Agreement Two Entity Small Business Entity Small Business TEEEF Lease Two TEEEF Lease Two [Member] TEEEF Lease Two Investments [Domain] Investments [Domain] Local Phone Number Local Phone Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Letters of Credit Letter of Credit [Member] Forward interest rate derivative notional amount Derivative, Notional Amount Payments of commercial paper, net Repayments of Commercial Paper Measurement Frequency [Axis] Measurement Frequency [Axis] Allowed equity return not recognized Amount Of Allowed Equity Return Not Recognized In Period Amount Of Allowed Equity Return Not Recognized In Period Restricted cash included in Prepaid expenses and other current assets Restricted Cash and Cash Equivalents, Current Retirement Plan Type [Domain] Retirement Plan Type [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Pension and Other Postretirement Plans Costs Pension and Other Postretirement Plans Costs [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Total Revenues Revenues Revenues 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 Total other liabilities Liabilities, Other than Long-Term Debt, Noncurrent Transaction costs Disposal Group, Not Discontinued Operations, Transaction Costs Disposal Group, Not Discontinued Operations, Transaction Costs Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Estimated capital expenditure to clean ash ponds Estimated Capital Expenditure To Clean Ash Ponds Estimated Capital Expenditure to Clean Ash Ponds Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Award Type [Axis] Award Type [Axis] Document Quarterly Report Document Quarterly Report February 2021 Winter Storm Event February 2021 Winter Storm Event [Member] February 2021 Winter Storm Event Non-cash transactions: Noncash Investing and Financing Items [Abstract] No Trading Symbol Flag No Trading Symbol Flag Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Common Stock dividends declared (see Note 18) Dividends, Common Stock Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Hedging Designation [Axis] Hedging Designation [Axis] Goodwill [Line Items] Goodwill [Line Items] Property, plant and equipment Property, Plant and Equipment, Gross ROU assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Schedule of Dividends Declared Dividends Declared [Table Text Block] Related Party Transactions (Houston Electric and CERC) Related Party Transactions Disclosure [Text Block] Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Number of days until commercial paper maturity (in days) Number Of Days Until Commercial Paper Maturity Number of days until commercial paper maturity. Total contributions to the plans during the period Defined Benefit Plan, Plan Assets, Contributions by Employer PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Leases Lessee, Finance Leases [Text Block] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Receivables, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Disallowance Of Reimbursement Clause Exercised Disallowance Of Reimbursement Clause Exercised Disallowance Of Reimbursement Clause Exercised Current operating lease liability Operating Lease, Liability, Current Miles of pipeline (in miles) Length Of Pipeline Length Of Pipeline 2026 Lessee, Operating Lease, Liability, to be Paid, Year Three 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. Net Balance Finite-Lived Intangible Assets, Net New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accrued unbilled revenues Unbilled Receivables, Current 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. Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization REP Bad Debt Expense REP Bad Debt Expense [Member] REP Bad Debt Expense 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Settlement Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) From Settlement, Reclassification Adjustment From AOCI, Before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) From Settlement, Reclassification Adjustment From AOCI, Before Tax Public Utility Commission Of Texas Public Utility Commission Of Texas [Member] Public Utility Commission Of Texas Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [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 Customer deposits Customer deposits Contract with Customer, Liability, Current Current Assets: Non-trading derivative assets Current Assets [Member] Current Assets Security Exchange Name Security Exchange Name Redemption of Series A Preferred Stock Stock Redeemed or Called During Period, Value Notes receivable–affiliated companies Financing Receivable, after Allowance for Credit Loss, Current Corporate service charges Selling, General and Administrative Expense Accumulated other comprehensive loss Accumulated other comprehensive income Beginning Balance Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Employee Stock Option Employee Stock Option [Member] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Total Costs and Expenses Settlement cost (benefit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Maximum Maximum [Member] Document Type Document Type Regulatory Agency [Axis] Regulatory Agency [Axis] Years to resolve contingency Site Contingency, Years To Resolve Contingency This represents the estimated years necessary to resolve the contingency. Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Tabular List, Table Tabular List [Table Text Block] 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. Chief Executive Officer Chief Executive Officer [Member] Ash Pond Facility [Axis] Ash Pond Facility [Axis] Ash Pond Facility Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Payment of dividends on Preferred Stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Remainder of 2023 Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] A.B. Brown A.B. Brown [Member] A.B. Brown Derivative [Table] Derivative [Table] Regulatory asset, approximate total gas cost Regulatory Asset, Approximate Total Gas Cost Regulatory Asset, Approximate Total Gas Cost Variable Rate [Axis] Variable Rate [Axis] 2024 Lessor, Operating Lease, Payment to be Received, Year One Expenses: Expenses: Expenses: Costs and Expenses [Abstract] Title of 12(b) Security Title of 12(b) Security Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Related Party [Domain] Related Party, Type [Domain] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Operating Segments Operating Segments [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Entity Tax Identification Number Entity Tax Identification Number Securitization Bonds Securitization Bonds [Member] Securitization Bonds Total lease cost Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Other current assets and liabilities Increase (Decrease) in Other Current Assets SOFR Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) Balance Sheet Location [Domain] Balance Sheet Location [Domain] Operating Activities [Domain] Operating Activities [Domain] Entity Interactive Data Current Entity Interactive Data Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Asset retirement obligation Asset Retirement Obligation Proceeds form issuance of debt, amount to be disbursed or allocated to finance or refinance projects Proceeds From Issuance Of Debt, Amount To Be Disbursed Or Reallocated Proceeds From Issuance Of Debt, Amount To Be Disbursed Or Reallocated Nontaxable Municipal Bonds Nontaxable Municipal Bonds [Member] Measure: Measure [Axis] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Name Outstanding Recovery, Individual Name Revenues from Contract with Customers Revenue from Contract with Customer [Policy Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2027 Purchase Obligation, to be Paid, Year Four Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 2024 Purchase Obligation, to be Paid, Year One Operating cash flows from operating leases included in the measurement of lease liabilities Operating Lease, Payments Common stock, outstanding (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Common Stock, Shares, Outstanding SIGECO First Mortgage Bonds Due 2034 SIGECO First Mortgage Bonds Due 2034 [Member] SIGECO First Mortgage Bonds Due 2034 Interest cost Defined Benefit Plan, Interest Cost Investments Investments [Member] Equity securities Fair Value Assets Measured On Recurring Basis Corporate Equities This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. PEO PEO [Member] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Schedule of Operating Lease Payments to be Received Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Employee Benefit Plans Retirement Benefits [Text Block] Preferred stock dividends paid per share (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid Other operating activities, net Other operating activities, net Other Operating Activities, Cash Flow Statement Conversion price percentage Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Subordinated Debt ZENS Subordinated Debt ZENS 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. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Debt Instrument [Axis] Debt Instrument [Axis] Non-utility revenues Unregulated Operating Revenue Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Indiana Gas Service Territory Indiana Gas Service Territory [Member] Represents the areas in Indiana serviced by Indiana Gas Service Catastrophic Event [Axis] Catastrophic Event [Axis] Credit Facility [Axis] Credit Facility [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] General Mortgage Bonds 4.95% Due 2033 General Mortgage Bonds 4.95% Due 2033 [Member] General Mortgage Bonds 4.95% Due 2033 Measurement Frequency [Domain] Measurement Frequency [Domain] 2026 Lessor, Operating Lease, Payment to be Received, Year Three Title of Individual [Axis] Title of Individual [Axis] Operation and maintenance Operation and maintenance Operation and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Preferred stock, dividends declared (in dollars per share) Preferred Stock, Dividends Per Share, Declared Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Operating Activities [Axis] Operating Activities [Axis] Restoration costs Restoration Costs Restoration Costs Related Party Transaction [Domain] Related Party Transaction [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Affiliated Entity Affiliated Entity [Member] Tax benefit (expense) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 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. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Total current assets Assets, Current Cumulative Preferred Stock Preferred Stock Preferred Stock [Member] CERC Senior Notes, 5.25% Due May 2028 CERC Senior Notes, 5.25% Due May 2028 [Member] CERC Senior Notes, 5.25% Due May 2028 Net periodic cost (benefit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Cash Payments/Receipts: Supplemental Cash Flow Information [Abstract] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Goodwill and Other Intangibles (CenterPoint Energy and CERC) Goodwill and Intangible Assets Disclosure [Text Block] New Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Transition services agreement charges 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 Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Regulatory liabilities Regulatory Liability, Noncurrent CERC Term Loan 5.25% Due 2024 CERC Term Loan 0.85% Due 2024 [Member] CERC Term Loan 0.85% Due 2024 Postretirement benefit plans Other Postretirement Benefits Plan [Member] Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Common Stock, $0.01 Par Value Common Stock, $0.01 Par Value [Member] Common Stock, $0.01 Par Value [Member] Class of Stock [Axis] Class of Stock [Axis] Entities [Table] Entities [Table] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] 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) Amortization of prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Other Information Related to Leases [Abstract] Other Information Related to Leases [Abstract] Other Information Related to Leases [Abstract] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Estimated remediation costs Site Contingency Loss Exposure Estimate of the reasonably possible loss exposure at an individual site. Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Term Loan Due February 2024 Term Loan Due February 2024 [Member] Term Loan Due February 2024 Entity Information [Line Items] Entity Information [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Commercial Paper Commercial Paper [Member] General Mortgage Bonds General Mortgage Bonds [Member] General Mortgage Bonds Revenue recognized included in the opening contract liability for the period Contract with Customer, Liability, Revenue Recognized Contract Balances [Line Items] Contract Balances [Line Items] [Line Items] for Contract Balances [Table] Ash Pond Facility [Domain] Ash Pond Facility [Domain] Ash Pond Facility [Domain] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Income available to common shareholders - basic Net Income (Loss) Available to Common Stockholders, Including Adjustment For Preferred Stock, Basic Net Income (Loss) Available to Common Stockholders, Including Adjustment For Preferred Stock, Basic Continuing Operations Continuing Operations [Member] 2028 Purchase Obligation, to be Paid, Year Five Parent Company Parent Company [Member] Energy Transfer Common Units Energy Transfer Common Units [Member] Energy Transfer Common Units Schedule of Operating Lease Income Operating Lease, Lease Income [Table Text Block] 3-Year Rate Forward Interest Rate Agreement One [Member] Forward Interest Rate Agreement One 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] 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Title Trading Arrangement, Individual Title WBD Common WBD Common [Member] WBD Common Common Stock Common Stock [Member] Individual: Individual [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Number of leases entered into Number Of Leases Commenced Number Of Leases Commenced Income Statement Location [Domain] Income Statement Location [Domain] General Mortgage Bonds March Due 2023 General Mortgage Bonds March Due 2033 [Member] General Mortgage Bonds March Due 2033 Non-trading derivative assets Derivative Asset, Noncurrent Weighted Average Interest Rate Debt, Weighted Average Interest Rate Minimum Minimum [Member] Property, plant and equipment, net Property, Plant and Equipment, Net Common Stock dividends paid per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Other comprehensive loss Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Disposal Group Classification [Axis] Disposal Group Classification [Axis] Statement of Cash Flows [Abstract] ASSETS Assets [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from long-term debt and term loans Proceeds from Issuance of Long-Term Debt Schedule of Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Minnesota and Indiana Gas Service Territories Minnesota and Indiana Gas Service Territories [Member] Minnesota and Indiana Gas Service Territories Net affiliate service charges (billings) 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. Other Assets: Non-trading derivative assets Other Current Assets [Member] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Retirement Plan Type [Axis] Retirement Plan Type [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Other investing activities, net Payments for (Proceeds from) Other Investing Activities Retained Earnings Retained Earnings [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Other Income (Expense): Other Income (Expense): Other Income (Expense): Nonoperating Income (Expense) [Abstract] Basic Earnings Per Common Share (in dollars per share) Earnings Per Share, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Operation and maintenance agreements Operation and maintenance agreements [Member] Operation and maintenance agreements [Member] Indiana Electric Indiana Electric [Member] Operations of SIGECO's electric transmission and distribution services, including power generation and wholesale power operations. [Member] Pending Litigation Pending Litigation [Member] Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Accounts payable Increase (Decrease) in Accounts Payable Payments for the Redemption of Preferred Stock Payments for the Redemption of Preferred Stock Payments for the Redemption of Preferred Stock 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] Schedule of Revenue by Major Customers by Reporting Segments Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] 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. Property, Plant and Equipment: Property, Plant and Equipment [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Natural Gas Supply Natural Gas and Coal [Member] Natural Gas and Coal All Trading Arrangements All Trading Arrangements [Member] Gain (loss) on sale Loss (gain) on divestitures Gain on sale Gain (loss) on sale Loss on sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Remaining three months of 2023 Purchase Obligation, to be Paid, Remainder of Fiscal Year All Adjustments to Compensation All Adjustments to Compensation [Member] Compensation Amount Outstanding Recovery Compensation Amount Cash proceeds received from government grants Cash Proceeds Received From Government Grants Cash Proceeds Received From Government Grants 7-Year Rate Forward Interest Rate Agreement Three [Member] Forward Interest Rate Agreement Three Utility natural gas, fuel and purchased power Utility natural gas Utilities Operating Expense, Gas and Petroleum Purchased Derivative assets Derivative Asset Deferred income taxes Deferred Income Tax Expense (Benefit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Contribution from parent Proceeds from Contributions from Parent Debt instrument, convertible, number of equity instruments (in shares) Debt Instrument, Convertible, Number of Equity Instruments Comprehensive income available to common shareholders Comprehensive Income (Loss) Available To Common Stockholders Comprehensive Income (Loss) Available To Common Stockholders Convertible Debt Convertible Debt [Member] Contract Liabilities Change in Contract Liability [Roll Forward] Change in Contract Liability [Roll Forward] IURC IURC [Member] IURC Minnesota Public Utility Commission Minnesota Public Utility Commission [Member] Minnesota Public Utility Commission Total contributions expected in current year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year 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. CNP Term Loan 1.50% Due 2023 CNP Term Loan 1.50% Due 2023 [Member] CNP Term Loan 1.50% Due 2023 Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Tom Green County Tom Green County [Member] Tom Green County Restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Taxes other than income taxes Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Liability recorded for environmental loss contingencies Accrual for Environmental Loss Contingencies Unrealized gains (losses) Equity Securities, FV-NI, Unrealized Gain (Loss) Exchange [Domain] Exchange [Domain] Document Period End Date Document Period End Date Adoption Date Trading Arrangement Adoption Date CERC Senior Notes 5.25% Due 2028 CERC Senior Notes, 5.25% Due February 2028 [Member] CERC Senior Notes, 5.25% Due February 2028 2029 and beyond Purchase Obligation, to be Paid, after Year Five Weighted-average discount rate - finance leases (as a percent) Finance Lease, Weighted Average Discount Rate, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Income tax expense Income Tax Expense (Benefit) Environmental Improvement Revenue Bonds, Series 2014 Environmental Improvement Revenue Bonds, Series 2014 [Member] Environmental Improvement Revenue Bonds, Series 2014 Finance ROU assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Fair Value Measurements Fair Value Disclosures [Text Block] Bellwether Cases Bellwether Cases [Member] Bellwether Cases 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. Posey Solar Posey Solar [Member] Posey Solar Shareholders’ Equity: Member’s Equity: Equity [Abstract] Weighted-average remaining lease term (in years) - operating leases Operating Lease, Weighted Average Remaining Lease Term Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Less: Preferred stock dividend requirement (Note 18) Preferred stock dividend requirement Preferred Stock Dividends, Income Statement Impact Preferred stock redemption price (per share) Preferred Stock, Redemption Price Per Share Environmental Improvement Revenue Bonds, Series 2013 Environmental Improvement Revenue Bonds, Series 2013 [Member] Environmental Improvement Revenue Bonds, Series 2013 2025 Lessor, Operating Lease, Payment to be Received, Year Two Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Lease Disclosure [Line Items] Lease Disclosure [Line Items] [Line Items] for Lease Disclosure [Table] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Credit Facility [Domain] Credit Facility [Domain] 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. Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Adjustment to pension and other postretirement plans, tax Adjustment to pension and other postemployment plans, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Number of instruments held Derivative, Number of Instruments Held Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Interest rate derivatives Interest rate derivatives Interest Rate Contract [Member] Schedule of Contract with Customer, Contract Asset, Contract Liability and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Regulated Operations [Abstract] Revenue Recognition and Allowance for Credit Losses Revenue from Contract with Customer [Text Block] Additional Paid-in-Capital Additional Paid-in Capital [Member] Net deferred gain from cash flow hedges (net of tax of $-0-, $-0-, $-0- and $-0-) Net deferred gain from cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Plus: Incremental shares from assumed conversions: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Environmental Improvement Revenue Bonds, Series 2015 Environmental Improvement Revenue Bonds, Series 2015 [Member] Environmental Improvement Revenue Bonds, Series 2015 Balance Sheet Location [Axis] Balance Sheet Location [Axis] General mortgage bonds used as collateral General Mortgage Bonds Used As Collateral General Mortgage Bonds Used As Collateral Loss Contingencies [Line Items] Loss Contingencies [Line Items] Cover [Abstract] Cover [Abstract] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Fair Value, Recurring Fair Value, Recurring [Member] Dividend to parent Payments of Dividends Other non-current liabilities Other Liabilities, Noncurrent Total lease payments Lessee, Operating Lease, Liability, to be Paid Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] 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. Reportable Segments Segment Reporting Disclosure [Text Block] Cash paid to parent for property, plant and equipment below Cash Paid To Parent For Property, Plant And Equipment Cash Paid To Parent For Property, Plant And Equipment Natural Gas Supply Natural Gas [Member] Equity Component [Domain] Equity Component [Domain] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Long-term Debt: Long-Term Debt, Unclassified [Abstract] Entity Current Reporting Status Entity Current Reporting Status Operating Income Operating Income (Loss) Consolidated Entities [Domain] Consolidated Entities [Domain] Catastrophic Event [Domain] Catastrophic Event [Domain] Segments [Axis] Segments [Axis] Fair value Estimate of Fair Value Measurement [Member] Regulatory Asset [Axis] Regulatory Asset [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Long-term line of credit Long-Term Line of Credit Customer relationships Customer Relationships [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Variable Rate [Domain] Variable Rate [Domain] Pay vs Performance Disclosure [Line Items] Ratio of indebtedness to net capital (as a percent) Ratio of Indebtedness to Net Capital Statistical Measurement [Domain] Statistical Measurement [Domain] General Mortgage Bonds 5.30% Due 2053 General Mortgage Bonds 5.30% Due 2053 [Member] General Mortgage Bonds 5.30% Due 2053 Economic hedge Derivative Liability, Notional Amount Underlying Security Market Price Change Underlying Security Market Price Change, Percent Preferred stock, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Harris County Harris County [Member] Harris County CNP Convertible Notes 4.25% Due 2026 CNP Convertible Notes 4.25% Due 2026 [Member] CNP Convertible Notes 4.25% Due 2026 Short-term Borrowings and Long-term Debt Debt Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Leases, Lease Income [Abstract] Operating Lease, Lease Income [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Loans Revolving Credit Facility [Member] Discretionary contribution Defined Contribution Plan, Employer Discretionary Contribution Amount Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Regulatory asset, revenue requirement amount Regulatory Asset, Revenue Requirement Amount Regulatory Asset, Revenue Requirement Amount Income allocated to preferred shareholders Income allocated to preferred shareholders Total income allocated to preferred shareholders Preferred Stock Dividends and Other Adjustments MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Segment Reporting [Abstract] Segment Reporting [Abstract] Accounts payable Accounts Payable, Current Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Restatement Determination Date: Restatement Determination Date [Axis] Other Pension, Postretirement and Supplemental Plans Other Pension, Postretirement and Supplemental Plans [Member] Energy Transfer Series G Preferred Units Energy Transfer Series G Preferred Units [Member] Energy Transfer Series G Preferred Units Total Nonoperating Income (Expense) Pending lawsuits Loss Contingency, Pending Claims, Number Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs [Member] Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs Commitments and Contingencies (Note 13) Commitments and Contingencies Operating Lease Liabilities, Payments Due [Abstract] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Reclassification of deferred loss from cash flow hedges realized in net income, 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 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 SIGECO First Mortgage Bonds Due 2029 SIGECO First Mortgage Bonds Due 2029 [Member] SIGECO First Mortgage Bonds Due 2029 Schedule of Goodwill [Table] Schedule of Goodwill [Table] Geographical [Axis] Geographical [Axis] Income Taxes Income Tax Disclosure [Text Block] 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) CNP Securitization Bonds SIGECO Securitization Bonds [Member] SIGECO Securitization Bonds Increase (decrease) in contract liabilities Increase (Decrease) in Contract with Customer, Liability Indexed debt securities derivative Indexed debt securities derivative Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Fair Value, Assets Measured on Recurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Derivative Liabilities Fair Value Derivative Liability, Subject to Master Netting Arrangement, before Offset PEO Total Compensation Amount PEO Total Compensation Amount Secured debt Secured Debt Hedging Relationship [Axis] Hedging Relationship [Axis] Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Goodwill [Roll Forward] Goodwill [Roll Forward] Bond Companies and Securitization Bond Company Bond Companies and Securitization Bond Company [Member] Bond Companies and Securitization Bond Company Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Leases Lessor, Operating Leases [Text Block] Regulatory assets Regulatory assets current Regulatory Asset, Current Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Investments, including money market funds Investments, Fair Value Disclosure Carrying amount or fair value Long-Term Debt, Fair Value Net Income Net income Net income Net income (loss) Net Income (Loss) Total current liabilities Total current liabilities Liabilities, Current Derivative Contract Type [Domain] Derivative Contract [Domain] Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Company Selected Measure Name Company Selected Measure Name Leases Lessee, Operating Leases [Text Block] Interest accrued Interest Payable, Current LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Houston Electric Houston Electric [Member] Houston Electric [Member] Current Liabilities Current Liabilities [Member] Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included. Non-utility cost of revenues, including natural gas Non-utility cost of revenues, including natural gas Cost of Goods and Services Sold Expenses associated with long term lease Long Term Lease, Expense, Deferred Regulatory Asset Long Term Lease, Expense, Deferred Regulatory Asset Income Tax Contingency [Table] Income Tax Contingency [Table] Litigation Status [Domain] Litigation Status [Domain] Other Commitments [Table] Other Commitments [Table] Name Measure Name Name Forgone Recovery, Individual Name General Mortgage Bonds 5.20% Due 2028 General Mortgage Bonds 5.20% Due 2028 [Member] General Mortgage Bonds 5.20% Due 2028 Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Third Party AMAs Third Party AMAs [Member] Third Party AMAs Measurement Basis [Axis] Measurement Basis [Axis] Underlying Securities Award Underlying Securities Amount Number of owned coal ash ponds Number of Owned Coal Ash Ponds Number of Owned Coal Ash Ponds CERC Term Loan 0.70%Due 2023 CERC Term Loan Zero Point Seven Due 2023 [Member] CERC Term Loan Zero Point Seven Due 2023 Fair Value Measurement [Domain] Fair Value Measurement [Domain] 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. Subsidiaries Subsidiaries [Member] Common stock, dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Other long-term debt, net Other Long-Term Debt, Noncurrent Non-current operating lease liability Operating Lease, Liability, Noncurrent Schedule of Allowed Equity Return Not Recognized Allowed Equity Return Not Recognized [Table Text Block] Allowed Equity Return Not Recognized Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Payment of debt issuance costs Payments of Debt Issuance Costs SIGECO SIGECO [Member] SIGECO [Member] CERC Floating Rate Senior 0.5% Due 2023 CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 [Member] CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 Income Statement Location [Axis] Income Statement Location [Axis] Total leased assets Lease Right-Of-Use Asset Total Leased Right-Of-Use-Assets 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] Benefit obligations Liability, Defined Benefit Plan, Noncurrent 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 Decrease in notes payable–affiliated companies Repayments of Related Party Debt CNP First Mortgage Bonds 5.04% Due 2033 CNP First Mortgage Bonds 5.04% Due 2033 [Member] CNP First Mortgage Bonds 5.04% Due 2033 Schedule of Operating Lease Liability Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Schedule of Estimated Fair Value of Financial Instruments, Debt Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] 6.625% Senior Notes due 2037 6.625% Senior Notes due 2037 [Member] 6.625% Senior Notes due 2037 [Member] Accounts and notes receivable (payable) - affiliate companies Accounts and notes receivable (payable) - affiliate companies [Member] Accounts and notes receivable (payable) - affiliate companies [Member] Temporary Equity (Note 18) Temporary Equity, Carrying Amount, Attributable to Parent Other Performance Measure, Amount Other Performance Measure, Amount Schedule of Lease Cost Lease, Cost [Table Text Block] Inventory Increase (Decrease) in Inventories Opening balance as of December 31, 2022 Closing balance as of September 30, 2023 Contract with Customer, Asset, after Allowance for Credit Loss, Current Increase (decrease) in accounts receivable Increase (Decrease) In Accounts Receivable On Contracts With Customers Increase (Decrease) In Accounts Receivable On Contracts With Customers Pike Solar Pike Solar [Member] Pike Solar Litigation Status [Axis] Litigation Status [Axis] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Taxes receivable Income Taxes Receivable, Current Recovery of deferred costs sought Regulatory Asset, Asset Recovery Of Deferred Costs From Assessment Regulatory Asset, Asset Recovery Of Deferred Costs From Assessment Accounts payable related to capital expenditures Capital Expenditures Incurred but Not yet Paid Retention incentive agreement, shares issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Contract Balances [Table] Contract Balances [Table] Contract Balances [Table] Allowance for Credit Losses Financing Receivable [Policy Text Block] Other Adjustments to Additional Paid in Capital, Other Trading Arrangement: Trading Arrangement [Axis] Preferred Stock Dividends and Other Adjustments [Abstract] Preferred Stock Dividends and Other Adjustments [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Loss Contingencies [Table] Loss Contingencies [Table] 2029 and beyond Lessee, Operating Lease, Liability, to be Paid, after Year Five Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Amortization expense of intangible assets recorded in Depreciation and amortization Amortization of Intangible Assets Entity Shell Company Entity Shell Company F.B. Culley East F.B. Culley East [Member] F.B. Culley East Restatement Determination Date Restatement Determination Date Disallowance of regulatory asset Disallowance of Regulatory Asset Disallowance of Regulatory Asset Regulatory asset, issued Amount Of Securitization Bonds Issued Amount Of Securitization Bonds Issued Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Regulatory Agency [Domain] Regulatory Agency [Domain] Schedule of Preferred Stock Schedule of Stock by Class [Table Text Block] 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 Equivalents, Restricted Cash, and Restricted Cash Equivalents Operating lease cost Operating Lease, Cost Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Utility revenues Regulated Operating Revenue Total assets Assets, Fair Value Disclosure U.S. treasury rate term (in years) Derivative Instrument, Tresury Rate Term Derivative Instrument, Tresury Rate Term Schedule of Finite-lived Intangible Assets Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Other financing activities, net Proceeds from (Payments for) Other Financing Activities Comprehensive income (loss) Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Affiliates of Vistra Energy Corp. Affiliates of Vistra Energy Corp. [Member] Affiliates of Vistra Energy Corp. [Member] Chicago Stock Exchange NYSE Chicago [Member] NYSE Chicago Entity Address, Address Line One Entity Address, Address Line One Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Net regulatory assets and liabilities Increase (Decrease) in Regulatory Assets and Liabilities 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. Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Taxes accrued Taxes Payable, Current Regulatory assets Regulatory Asset Subsequent Event Subsequent Event [Member] New York Stock Exchange New York Stock Exchange [Member] New York Stock Exchange [Member] Balance of investment owned (in shares) Investment Owned, Balance, Shares Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Preferred Stock [Abstract] Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Other current liabilities Other Liabilities, Current Income Statement [Abstract] Income Statement [Abstract] Long-Term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Decrease in contract assets Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Depreciation and amortization expense Depreciation and amortization expense [Member] Depreciation and amortization expense [Member] 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. Gains (Losses) in Other Income (Expense) Nonoperating Income (Expense) [Member] Contract Assets Change in Contract Asset [Roll Forward] Change in Contract Asset [Roll Forward] Issuances related to benefit and investment plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Dividends accrued Dividends Payable, Current Class of Stock [Line Items] Class of Stock [Line Items] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Diluted Earnings (Loss) Per Common Share Earnings Per Share, Diluted [Abstract] Regulatory liability, amount remaining under prudence review Regulatory Liability, Amount Remaining Under Prudence Review Regulatory Liability, Amount Remaining Under Prudence Review Financial Instrument [Axis] Financial Instrument [Axis] Divestitures (CenterPoint Energy and CERC) Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Schedule of Dividend Requirement on Preferred Stock Dividend Requirement on Preferred Stock [Table Text Block] Table of dividend requirement on preferred stock Other Liabilities: Other Liabilities [Abstract] Total Shareholder Return Amount Total Shareholder Return Amount Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Warrick County Warrick County [Member] Warrick County Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [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. Affiliates of NRG Affiliates of NRG Energy, Inc. [Member] Affiliates of NRG Energy, Inc. [Member] Segments [Domain] Reporting Segment [Domain] Segments [Domain] Fair Value Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] LIBOR Plus LIBOR Plus [Member] LIBOR Plus Retained earnings Retained earnings Retained Earnings (Accumulated Deficit) Accrued unbilled revenues, after allowance for credit losses, current Accrued Unbilled Revenues, After Allowance For Credit Losses, Current Accrued Unbilled Revenues, After Allowance For Credit Losses, Current Debt instrument, face amount Aggregate Principal Amount Debt Instrument, Face Amount Current Assets: Assets, Current [Abstract] Leases [Abstract] Other Commitments [Line Items] Other Commitments [Line Items] Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other Technology Hardware and Software [Member] Technology Hardware and Software Held for sale Disposal Group, Including Discontinued Operation, Goodwill Debt instrument, convertible, conversion price (in dollar per shares) Debt Instrument, Convertible, Conversion Price Debt instrument, convertible, conversion ratio Debt Instrument, Convertible, Conversion Ratio Disposal Group Name [Domain] Disposal Group Name [Domain] Earnings Per Common Share: Earnings Per Share, Basic [Abstract] Lease, Right To Terminate, Percentage Of Prepaid Lease Costs Refunded Lease, Right To Terminate, Percentage Of Prepaid Lease Costs Refunded Lease, Right To Terminate, Percentage Of Prepaid Lease Costs Refunded Accounts receivable and unbilled revenues, net Increase (Decrease) in Accounts and Other Receivables Indexed debt, net Indexed Debt Current Inventory financings Other Short-Term Borrowings Derivative Assets Fair Value Derivative Asset, Subject to Master Netting Arrangement, before Offset Loss from Catastrophes Loss from Catastrophes [Member] Class of Stock [Domain] Class of Stock [Domain] Name of Major Customer [Domain] Customer [Domain] Income Available to Common Shareholders Net Income (Loss) Available to Common Stockholders, Basic First Mortgage Bonds First Mortgage Bonds [Member] First Mortgage Bonds Current portion of other long-term debt Other Long-Term Debt, Current Schedule of Supplemental Balance Sheet Information Related To Leases Supplemental Balance Sheet Information Related To Leases [Table Text Block] Supplemental Balance Sheet Information Related To Leases [Table Text Block] Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Carrying Value Investment Owned, Fair Value Total leased liabilities Present value of lease liabilities Operating Lease, Liability Net uncertain tax liability Liability for Uncertainty in Income Taxes, Noncurrent Background and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Equity purchase agreement, purchase price Disposal Group, Including Discontinued Operation, Consideration Remaining shares available to be awarded (in shares) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Remaining Shares Available For Grant Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Remaining Shares Available For Grant Schedule of Amount Allowed Equity Return Recognized in Period Schedule Of Allowed Equity Return Recognized [Table Text Block] Schedule Of Allowed Equity Return Recognized Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount All Executive Categories All Executive Categories [Member] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Energy Systems Group Energy Systems Group [Member] Energy Systems Group Debt Disclosure [Abstract] Debt Disclosure [Abstract] Assets and Liabilities, Lessee [Abstract] Assets and Liabilities, Lessee [Abstract] Opening balance as of December 31, 2022 Closing balance as of September 30, 2023 Accounts Receivable For Contracts With Customers Accounts Receivable For Contracts With Customers Earnings Per Share [Abstract] Regulatory Asset [Domain] Regulatory Asset [Domain] Common stock Common Stock, Value, Issued Debt instrument, redemption price (as a percent) Debt Instrument, Redemption Price, Percentage Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Trade names Trade Names [Member] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Senior Notes Senior Notes [Member] Interest Payable Interest Payable 2028 Lessor, Operating Lease, Payment to be Received, Year Five Multi District Litigation Multi District Litigation (MDL) [Member] Multi District Litigation (MDL) Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Payment of obligation for finance lease Payment of obligation for finance lease Financing cash flows from finance leases included in the measurement of lease liabilities Finance Lease, Principal Payments SIGECO First Mortgage Bonds SIGECO First Mortgage Bonds [Member] SIGECO First Mortgage Bonds Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] All Individuals All Individuals [Member] 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. Regulatory Assets [Line Items] Regulatory Asset [Line Items] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Cash dividends paid to parent Payment Of Dividends To Parent Payment Of Dividends To Parent Litigation Case [Domain] Litigation Case [Domain] Other income, net Other income, net Other income (expense), net Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Attorney General's Office Attorney General's Office [Member] Attorney General's Office Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Build Transfer Agreement [Axis] Build Transfer Agreement [Axis] Build Transfer Agreement Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] PEO Name PEO Name CenterPoint Energy and Houston Electric CenterPoint Energy and Houston Electric [Member] CenterPoint Energy and Houston Electric Short-term lease cost Short-Term Lease Cost, Net Of Regulatory Asset Adjustment Short-Term Lease Cost, Net Of Regulatory Asset Adjustment Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Schedule of Goodwill Schedule of Goodwill [Table Text Block] Preferred stock, outstanding (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Preferred Stock, Shares Outstanding Utility Holding, LLC Utility Holding, LLC [Member] Utility Holding, LLC Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Money pool investments (borrowings) Money Pool Investments (Borrowings) Money Pool Investments (Borrowings) ZENS annual interest rate (as a percent) Interest Rate Debt Instrument, Interest Rate, Stated Percentage Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Total shareholders’ equity Balance, beginning of period Balance, end of period Equity, Attributable to Parent Texas State Court in Harris County, Texas Texas State Court in Harris County, Texas [Member] Texas State Court in Harris County, Texas Restricted stock Restricted Stock [Member] Convertible Notes Convertible Notes Payable [Member] Adjustment to basis spread (as a percent) Debt Instrument, Basis Spread On Variable Rate, Adjustment Debt Instrument, Basis Spread On Variable Rate, Adjustment Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Solar array generating capacity (in MW) Solar Array Generating Capacity Solar Array Generating Capacity Income Before Income Taxes Income from Continuing Operations Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Accrued unbilled revenues, allowance for credit losses Accrued Unbilled Revenues, Allowance For Credit Losses, Current Allowance for credit losses on accrued unbilled revenues Opening balance as of December 31, 2022 Closing balance as of September 30, 2023 Unbilled Contracts Receivable Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Hedging Designation [Domain] Hedging Designation [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Preferred stock aggregate liquidation preference Preferred Stock, Liquidation Preference, Value CNP First Mortgage Bonds 4.98% Due 2028 CNP First Mortgage Bonds 4.98% Due 2028 [Member] CNP First Mortgage Bonds 4.98% Due 2028 Energy Related Derivative Natural gas derivatives Energy Related Derivative [Member] Current tax expense of divestiture Disposal Group, Not Discontinued Operations, Tax Effect of Divestiture Disposal Group, Not Discontinued Operations, Tax Effect of Divestiture F.B. Culley F.B. Culley [Member] F.B. Culley Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Capital expenditures Payments to Acquire Productive Assets Bond Companies Bond Companies [Member] Bond Companies [Member] CERC Senior Notes 5.40% Due 2033 CERC Senior Notes 5.40% Due 2033 [Member] CERC Senior Notes 5.40% Due 2033 Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Schedule of Income Statement Impact of Derivative Activity Derivative Instruments, Gain (Loss) [Table Text Block] Non-cash contribution from parent Non-cash capital contribution from parent in payment for property, plant and equipment below Noncash Capital Contribution From Parent For Payments For Property, Plant And Equipment Noncash Capital Contribution From Parent For Payments For Property, Plant And Equipment Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Debt instrument, series of remarketing agreement to remarket Remarketing Agreement to Remarket, Number of Series Remarketing Agreement to Remarket, Number of Series 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Restricted stock units granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Recovery of costs Recovery of Direct Costs City Area Code City Area Code Earnings Per Share (CenterPoint Energy) Earnings Per Share [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Harris County vs. CERC - Putative Harris County vs. CERC - Putative [Member] Harris County vs. CERC - Putative Net deferred gain from cash flow hedges, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Number of registrants Number of registrants Number of registrants Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Other Other Financial Instrument [Member] Other Financial Instrument Gain (loss) on derivative instruments not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Schedule of Environmental Loss Contingencies by Site Schedule of Environmental Loss Contingencies by Site [Table Text Block] Charter Common Charter Common [Member] Charter Common [Member] 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 and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Arkansas and Oklahoma Natural Gas Businesses Arkansas and Oklahoma Natural Gas Businesses [Member] Arkansas and Oklahoma Natural Gas Businesses TEEEF Lease One TEEEF Lease One [Member] TEEEF Lease One Contribution from parent Contribution From Parent Contribution From Parent Nonrelated Party Nonrelated Party [Member] Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Long-Term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Income tax payments, net Income Taxes Paid, Net 2029 and beyond Lessor, Operating Lease, Payment to be Received, after Year Five Indexed debt securities derivative IDS Derivative [Member] Derivative instrument related to indexed debt securities Electric Electric Segment [Member] Electric segment consists of Houston Electric T&D and Indiana Electric. Total Liabilities and Shareholders’ Equity Liabilities and Equity Other non-current assets Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Operating ROU assets Operating Lease, Right-of-Use Asset CNP First Mortgage Bonds Due 2044 CNP First Mortgage Bonds Due 2044 [Member] CNP First Mortgage Bonds Due 2044 Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Remainder of 2023 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Arrangement Duration Trading Arrangement Duration Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Motions to Remand Lawsuits Out Of MDL And Back Into Original Trial Courts Motions to Remand Lawsuits Out Of MDL And Back Into Original Trial Courts [Member] Motions to Remand Lawsuits Out Of MDL And Back Into Original Trial Courts Income available to common shareholders -diluted Net Income (Loss) Available to Common Stockholders, Including Adjustment For Preferred Stock, Diluted Net Income (Loss) Available to Common Stockholders, Including Adjustment For Preferred Stock, Diluted Electric Supply Electric Supply [Member] Electric Supply 2025 Purchase Obligation, to be Paid, Year Two 2026 Purchase Obligation, to be Paid, Year Three SOFR Plus Secured Overnight Financing Rate Plus [Member] Secured Overnight Financing Rate Plus Termination Date Trading Arrangement Termination Date Proceeds from sale of marketable securities Proceeds from Sale and Maturity of Marketable Securities Common stock, authorized (in shares) Common Stock, Shares Authorized Short-term borrowings Short-Term Debt Gain (loss) on equity securities Loss (gain) on equity securities Equity Securities, FV-NI, Gain (Loss) 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 Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Derivative [Line Items] Derivative [Line Items] Award Timing Disclosures [Line Items] Number of tranches Number of Tranches Number of Tranches Title of Individual [Domain] Title of Individual [Domain] Escrow Deposit Escrow Deposit Additional paid-in capital Additional Paid in Capital Transition services agreement, accounts receivable Transition Services Agreement, Accounts Receivable Transition Services Agreement, Accounts Receivable Schedule of Long-term Purchase Commitment Long-Term Purchase Commitment [Table Text Block] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Supplemental Disclosure of Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current February 2021 Winter Storm February 2021 Winter Storm [Member] February 2021 Winter Storm Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses Capital Distribution To Parent Associated With Sale Of Business Capital Distribution To Parent Associated With Sale Of Business Increase (decrease) in short-term borrowings, net Proceeds from (Repayments of) Other Debt Insider Trading Arrangements [Line Items] Regulatory asset, amortization period Regulatory Asset, Amortization Period Related Party [Axis] Related Party, Type [Axis] Proceeds from divestitures, net of cash divested Proceeds from Divestiture of Businesses, Net of Cash Divested Issuances related to benefit and investment plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Annual revenue increase from lease agreements Regulatory Asset, Lease, Annual Revenue Increase Regulatory Asset, Lease, Annual Revenue Increase Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount 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. Build Transfer Agreement [Domain] Build Transfer Agreement [Domain] Build Transfer Agreement [Domain] Regulatory Assets and Liabilities, Other Disclosures [Abstract] Regulatory Assets and Liabilities, Other Disclosure [Abstract] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] CNP First Mortgage Bonds 4.00% Due 2044 CNP First Mortgage Bonds 4.00% Due 2044 [Member] CNP First Mortgage Bonds 4.00% Due 2044 Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Estimated project costs Estimated Project Costs Estimated Project Costs Disposal Group Name [Axis] Disposal Group Name [Axis] 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] Corporate and Other Corporate and Other [Member] Payments of long-term debt and term loans, including make-whole premiums Payments of long-term debt Payments of long-term debt and term loan Repayments of Long-Term Debt Lease Disclosure [Table] Lease Disclosure [Table] Lease Disclosure [Table] Entity Central Index Key Entity Central Index Key Liabilities Liabilities, Fair Value Disclosure [Abstract] Long-term Debt Long-Term Debt [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Gross Carrying Amount Finite-Lived Intangible Assets, Gross CERC Senior Notes .70% due 2023 CERC Term Loan due 2023 [Member] CERC Term Loan due 2023 Undiscounted minimum payment obligation, term Unrecorded Unconditional Purchase Obligation, Term Preferred Stock dividends declared (see Note 18) Dividends, Preferred Stock, Cash Name Trading Arrangement, Individual Name Total Other comprehensive loss Net current period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 6.95% General Mortgage Bonds due 2033 6.95% General Mortgage Bonds due 2033 [Member] 6.95% General Mortgage Bonds due 2033 [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] CERC Senior Notes 0.70% Due 2023 CERC Senior Notes 0.70 percentage Due 2023 [Member] CERC Senior Notes 0.70 percentage Due 2023 Actuarial losses Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Revenue from contracts Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag 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. Finite-Live Intangible Assets [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Legal Entity [Axis] Legal Entity [Axis] Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Interest, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activities Assets Assets, Fair Value Disclosure [Abstract] 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. Mount Vernon Mount Vernon [Member] Mount Vernon Total long-term debt, net Long-Term Debt, Excluding Current Maturities Weighted-average remaining lease term (in years) - finance leases Finance Lease, Weighted Average Remaining Lease Term Schedule of Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Weighted Average Common Shares Outstanding, Diluted (in shares) Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Economic hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] 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. Disposals Goodwill, Written off Related to Sale of Business Unit Weighted average interest rate Money Pool Weighted Average Interest Rate Weighted average interest rate of outstanding transactions in money pool. Variable lease income Operating Lease, Variable Lease Income Company Selected Measure Amount Company Selected Measure Amount Expenses associated with short-term lease Short Term Lease, Expenses, Deferred To Regulatory Asset Short Term Lease, Expenses, Deferred To Regulatory Asset Lease, Cost [Abstract] Lease, Cost [Abstract] Total Assets Total Assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Indexed debt securities derivative Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Vectren Vectren [Member] Vectren [Member] Series A Preferred Stock Series A Preferred Stock [Member] Non-NEOs Non-NEOs [Member] Property, plant and equipment from parent Related Party Transaction, Purchases from Related Party 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. Materials and supplies Inventory, Raw Materials and Supplies, Gross Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees Proceeds From Issuance Of Long-Term Debt, Net Of Discounts And Issuance Expenses And Fees Proceeds From Issuance Of Long-Term Debt, Net Of Discounts And Issuance Expenses And Fees Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Pension plans Pension Plan [Member] 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. Redemption of Series A Preferred Stock (in shares) Redemption of Series A Preferred Stock (in shares) Stock Redeemed or Called During Period, Shares Regulatory liability, approximate total gas cost Regulatory Asset Remainting to Recover Through Rates and Other Sources, Amount Regulatory Asset Remainting to Recover Through Rates and Other Sources, Amount Non-PEO NEO Non-PEO NEO [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Customer Rate Relief Bond Financing Customer Rate Relief Bond Financing [Member] Customer Rate Relief Bond Financing Natural gas and coal inventory Energy Related Inventory, Natural Gas in Storage Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted Average Common Shares Outstanding, Basic (in shares) Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic CNP Senior Notes 5.25% Due 2026 CNP Senior Notes 5.25% Due 2026 [Member] CNP Senior Notes 5.25% Due 2026 Term Loan Term Loan [Member] Term Loan Increase in notes receivable–affiliated companies Increase (Decrease) in Notes Receivable, Related Parties Revenues: Revenues [Abstract] Regulatory asset remaining to recover through rates amount Regulatory Asset Remaining To Recover Through Rates Amount Regulatory Asset Remaining To Recover Through Rates Amount Statement of Other Comprehensive Income [Abstract] Other comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Total lease income Operating Lease, Lease Income Related Party Transaction [Axis] Related Party Transaction [Axis] Regulatory assets Regulatory assets noncurrent Regulatory Asset, Noncurrent Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Condensed Financial Statements [Table] Condensed Financial Statements [Table] 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 (in hundredths) Temporary increased percentage on limitation of debt to total capitalization under covenant (in hundredths) Proceeds from issuance of secured tax exempt debt Proceeds from Issuance of Secured Tax Exempt Debt