Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] 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 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 June 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-, $4, $-0- and $4) 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] Entity Small Business Entity Small Business TEEEF Lease Two TEEEF Lease Two [Member] TEEEF Lease Two Local Phone Number Local Phone Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Letters of Credit Letter of Credit [Member] 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 Current Assets [Member] Current Assets Security Exchange Name Security Exchange Name 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 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 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 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 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 provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Reclassification of deferred loss from cash flow hedges realized in net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 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] Subsequent Event [Line Items] Subsequent Event [Line Items] 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 Other Postretirement Benefits Plan Other Postretirement Benefits Plan [Member] 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 and diluted 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] 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] Non-trading derivative assets Derivative Asset, Noncurrent Weighted average interest rate of debt (as a percent) 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 Current Assets Other Current Assets [Member] Net cash 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 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 six 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 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 Comprehensive income available to common shareholders Comprehensive Income (Loss) Available To Common Stockholders Comprehensive Income (Loss) Available To Common Stockholders 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 (losses) gains 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 Preferred stock dividend requirement Preferred Stock Dividends, Income Statement Impact 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. 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Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included. 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Culley East F.B. Culley East [Member] F.B. 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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. 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This represents the current portion. Affiliates of NRG Affiliates of NRG Energy, Inc. [Member] Affiliates of NRG Energy, Inc. 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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 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 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 - basic and 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] Award Timing Disclosures [Line Items] 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 Regulatory liability, approximate total gas cost Incremental Uncollectible Receivables, Regulatory Asset Incremental Uncollectible Receivables, Regulatory Asset 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 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 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 (as a percent) 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. 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 Money pool weighted average interest rate (as a percent) 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 Derivative liabilities 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 Benefits 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. 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] Scenario [Axis] Scenario [Axis] Weighted Average Common Shares Outstanding, Basic (in shares) Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic 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