Dividends paid per share of stock Common Stock, Dividends, Per Share, Cash Paid SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Total equity and long-term debt Capitalization, Long-Term Debt and Equity Other Current Assets Other Current Assets [Member] Grosvenor Registered Multi Limited Partnership Grosvenor Registered Multi Limited Partnership [Member] Grosvenor Registered Multi Limited Partnership Postemployment Benefit Plans, Policy Postemployment Benefit Plans, Policy [Policy Text Block] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Regulatory Deferral of net periodic benefit costs Regulatory Deferral of net periodic benefit costs Regulatory Deferral of net periodic benefit costs Schedule of Nonvested Performance-Based Units Activity Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Insurance Contracts and Group Annuity Contracts Insurance Contracts and Group Annuity Contracts [Member] Insurance Contracts and Group Annuity Contracts OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Paid-in Capital [Member] Additional Paid-in Capital [Member] Winter weather event costs Winter weather event costs [Member] Winter weather event costs At-The-Market Program At-The-Market Program [Member] At-The-Market Program Capitalized non-service cost components Capitalized non-service cost components Capitalized non-service cost components Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Leases [Abstract] Leases [Abstract] Basic EPS Calculation Earnings Per Share, Basic [Abstract] DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Line items for Significant accounting policies of the reporting entity. Recently Issued Accounting Standards Update New Accounting Pronouncements, Policy [Policy Text Block] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Disclosure of commitments and contingencies [Table] Accounts payable Increase (Decrease) in Accounts Payable Construction in Progress Expenditures Incurred but Not yet Paid Construction in Progress Expenditures Incurred but Not yet Paid Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency 2.00% Senior Unsecured Notes Due 2030 2.00% Senior Unsecured Notes Due 2030 [Member] 2.00% Senior Unsecured Notes Due 2030 Basic Earnings Per Share, Basic Earnings Per Share, Basic Forward Contract Indexed to Issuer's Equity, Type [Domain] Forward Contract Indexed to Issuer's Equity, Type [Domain] Schedule of Health Care Cost Trend Rates Schedule of Health Care Cost Trend Rates [Table Text Block] Document Information, Document [Axis] Document Information, Document [Axis] REVENUE [Domain] REVENUE [Domain] [Domain] for Revenues disaggregated by source. Common Stock, Capital Shares Reserved for Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Revenue from Contract with Customer Revenue from Contract with Customer [Text Block] Deferred Tax Liabilities, Regulatory Assets Deferred Tax Liabilities, Regulatory Assets OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax Deferred Tax Assets, Gross Deferred Tax Assets, Gross Stock, Class of Stock [Table] Stock, Class of Stock [Table] Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Unbilled Receivables, Current Unbilled Receivables, Current Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Investment grade bonds Investment grade bonds [Member] Investment grade bonds Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid 4.960% Senior Unsecured Notes Due 2026 4.960% Senior Unsecured Notes Due 2026 [Member] 4.960% Senior Unsecured Notes Due 2026 Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Regulation Status [Axis] Regulation Status [Axis] ONE Gas Pension Plans [Member] Pension Plan [Member] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Depreciation and amortization Utilities Operating Expense, Depreciation and Amortization Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Variable Interest Entity, Measure of Activity, Income or Loss before Tax Pension and postretirement benefit costs, net [Member] Pension Costs [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents, Policy Cash and Cash Equivalents, Policy [Policy Text Block] Disaggregation of Revenue [Abstract] Total goodwill and other assets Investments and Other Noncurrent Assets Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Asset Impairment Charges Asset Impairment Charges Total equity Equity, beginning balance Equity, ending balance Equity, Attributable to Parent Share-Based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense Common Stock, Shares Authorized Common Stock, Shares Authorized Common stock issued, shares Stock Issued During Period, Shares, New Issues Current assets Assets, Current [Abstract] Public Utility Property, Plant, and Equipment Public Utility Property, Plant, and Equipment [Table Text Block] Total liabilities and equity Liabilities and Equity Liabilities and Equity Other Comprehensive (Income) Loss, Defined Benefit Plan, Before Reclassification Adjustment from AOCI, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Equity and Liabilities Liabilities and Equity [Abstract] State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Deferred Tax Assets, Other Deferred Tax Assets, Other Maximum [Member] Maximum [Member] Share-Based Payment Arrangement, Expense, after Tax Share-Based Payment Arrangement, Expense, after Tax Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Gas Transmission Equipment Gas Transmission Equipment [Member] Property, plant and equipment Property, Plant and Equipment, Net [Abstract] Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Granted Long-term Debt, Unclassified [Abstract] Long-Term Debt, Unclassified [Abstract] Other Postretirement Benefits, Plan Assets, Target Allocation, Percentage Other Postretirement Benefits, Plan Assets, Target Allocation, Percentage Other Postretirement Benefits, Plan Assets, Target Allocation, Percentage Accounting Policies [Abstract] Accounting Policies [Abstract] Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Accrued taxes other than income Increase (Decrease) in Property and Other Taxes Payable Lessee, Operating Lease, Liability, to be Paid, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Operating Lease, Liability Operating Lease, Liability Tax effect of state income tax deduction, Percent Tax effect of state income tax deduction, Effective Income Tax Rate Reconciliation, Percent Tax effect of state income tax deduction, Effective Income Tax Rate Reconciliation, Percent Fair Value Assets, Transfers between Levels Fair Value Assets, Transfers between Levels Amount of transfers of assets measured on a recurring basis between levels of the fair value hierarchy. Other Assets Other Assets [Member] DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes IRS 2022 Income Tax Return, Interest IRS 2022 Income Tax Return, Interest IRS 2022 Income Tax Return, Interest Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other deferred credits Other Liabilities, Noncurrent Shares sold under employee stock purchase plan Shares sold under employee stock purchase plan Shares sold under employee stock purchase plan Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accrued taxes other than income Accrual for Taxes Other than Income Taxes, Current Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Auditor Information [Abstract] Auditor Information [Abstract] Auditor Information Variable Interest Entity [Table] Variable Interest Entity [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Long-term debt, current maturities, net of issuance costs Long-Term Debt, Current Maturities Other intangible assets, net Other Intangible Assets, Net Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Line of Credit Facility [Table] Line of Credit Facility [Table] Asset Retirement Obligation Asset Retirement Obligation [Policy Text Block] Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Maximum Allowable Percentage Of Annual Base Pay Withheld To Purchase Our Common Stock Maximum Allowable Percentage Of Annual Base Pay Withheld To Purchase Our Common Stock Maximum Allowable Percentage Of Annual Base Pay Withheld To Purchase Our Common Stock Other regulatory liabilities Other regulatory liabilities [Member] Other regulatory liabilities Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent OGS: Other income - deferred carrying cost (a) Other income - deferred carrying cost (non-GAAP) Other income - deferred carrying cost (non-GAAP) Operating Leases, Future Minimum Payments Due, Next 12 Months Operating Leases, Future Minimum Payments Due, Next 12 Months Line of Credit Facility [Abstract] Line of Credit Facility [Abstract] Operating Lease, Liability, Current Operating Lease, Liability, Current Other, net Other, net [Member] Other Income and Expense, net Class of Stock [Line Items] Class of Stock [Line Items] Deferred income taxes Deferred Income Tax Liabilities, Net Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Document Fiscal Period Focus Document Fiscal Period Focus Employee Benefit Plans [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Award Type Award Type [Axis] Long-Term Debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Assets Investing activities Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Commercial paper maximum borrowing capacity Commercial paper maximum borrowing capacity Maximum borrowing capacity under the commercial paper program. Share-Based Payment Arrangement Share-Based Payment Arrangement [Policy Text Block] Finite-Lived Intangible Asset, Expected Amortization, Year One Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Regulatory Liability [Axis] Regulatory Liability [Axis] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Liability for Uncertainty in Income Taxes, Current Liability for Uncertainty in Income Taxes, Current Income Tax, Policy Income Tax, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Corporate Obligations Corporate Obligations [Member] Corporate Obligations Property, plant and equipment Public Utilities, Property, Plant and Equipment, Plant in Service US Large Cap Equity US Large Cap Equity [Member] US Large Cap Equity Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Gain (loss) on investments associated with nonqualified deferred compensation plans Gain (loss) on investments associated with nonqualified deferred compensation plans [Member] Gain (loss) on investments associated with nonqualified deferred compensation plans Regulatory assets and liabilities, noncurrent, net IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesNonCurrent IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesNonCurrent Finite-Lived Intangible Asset, Expected Amortization, Year Four Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Debt Issuance Costs, Net Debt Issuance Costs, Net Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount OGS: Adjusted net income - non-GAAP Adjusted net income (non-GAAP) Adjusted net income (non-GAAP) Gas Distribution Equipment Gas Distribution Equipment [Member] Allowance for Doubtful Accounts, Premiums and Other Receivables Allowance for Doubtful Accounts, Premiums and Other Receivables Short-term Debt [Text Block] Short-Term Debt [Text Block] Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Defined Benefit Plan, Expected Future Benefit Payment, Year One Defined Benefit Plan, Expected Future Benefit Payment, Year One Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Deferred Tax Liabilities, Regulatory Assets and Liabilities - other Deferred Tax Liabilities, Regulatory Assets and Liabilities - other Deferred Tax Liabilities, Regulatory Assets and Liabilities - other Schedule of Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities [Text Block] Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Reduction in income tax expense for the amortization of the regulatory liability associated with excess ADIT that was returned to customers Reduction in income tax expense for the amortization of the regulatory liability associated with excess ADIT that was returned to customers Reduction in income tax expense for the amortization of the regulatory liability associated with excess ADIT that was returned to customers Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Property, Plant and Equipment Disclosure Property, Plant and Equipment, Policy [Policy Text Block] Document Information [Table] Document Information [Table] Dividends Subsequent Event Type [Axis] Dividends Subsequent Event Type [Axis] Dividends Subsequent Event Type Forward Contract Indexed to At-the-Market Equity, Settlement, Original Number of Shares Forward Contract Indexed to At-the-Market Equity, Settlement, Original Number of Shares Forward Contract Indexed to At-the-Market Equity, Settlement, Original Number of Shares Public Utilities, Policy Public Utilities, Policy [Policy Text Block] MGP Costs [Member] [Member] MGP Costs [Member] [Member] Estimate of manufactured gas plant (MGP) costs expected to be incurred that have been recorded as a regulatory asset. May 2025 Equity Forward Agreement [Domain] May 2025 Equity Forward Agreement [Member] May 2025 Equity Forward Agreement Assets for Plan Benefits, Defined Benefit Plan Assets for Plan Benefits, Defined Benefit Plan Proceeds from issuance of long-term debt, net of premiums and discounts Proceeds from Issuance of Senior Long-Term Debt December 2026 Equity Forward Agreement December 2026 Equity Forward Agreement [Member] December 2026 Equity Forward Agreement Deferred Compensation Arrangement with Individual, Compensation Expense Deferred Compensation Arrangement with Individual, Compensation Expense Materials and supplies Increase (Decrease) in Materials and Supplies Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 4.50% Senior Unsecured Notes Due 2048 4.50% Senior Unsecured Notes Due 2048 [Member] 4.50% Senior Unsecured Notes Due 2048 Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Property, Plant and Equipment Intangible Assets, Finite-Lived, Policy Intangible Assets, Finite-Lived, Policy [Policy Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Total operating expenses Utilities Operating Expense Retained Earnings [Member] Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Share-Based Payment Arrangement [Abstract] Cash, cash equivalents, restricted cash and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] Income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit) Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Sale of Stock [Domain] Sale of Stock [Domain] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Document Information [Line Items] Document Information [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Mid Cap Equities Mid Cap Equities [Member] Mid Cap Equities Regulatory Assets and Liabilities Disclosure [Abstract] Regulatory Assets and Liabilities Disclosure [Abstract] Emerging Market Equities Emerging Market Equities [Member] Emerging Market Equities Dividends Payable, Date of Record Dividends Payable, Date of Record Amortization of EDIT Regulatory Liability Amortization of EDIT Regulatory Liability - Federal Tax Amortization of EDIT Regulatory Liability - Federal Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Swingline subfacility Bridge Loan Number of sites where regulatory closure has been achieved Number of sites where regulatory closure has been achieved Number of sites where regulatory closure has been achieved Defined Contribution Plan, Employer Discretionary Contribution Amount Defined Contribution Plan, Employer Discretionary Contribution Amount Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes Net periodic credit (cost) other than service cost Net periodic credit (cost) other than service cost [Member] Net periodic credit (cost) other than service cost Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Net regulatory assets and liabilities, noncurrent Net regulatory assets and liabilities, noncurrent The net amount of noncurrent regulatory assets less all noncurrent regulatory liabilities as of the end of the period. Employee Benefit Plans [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] City Area Code City Area Code Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received Debt Instrument, Redemption Price, Percentage Debt Instrument, Redemption Price, Percentage Interest Costs Capitalized Interest Costs Capitalized Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy Text Block] Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred Tax Assets, Regulatory Assets - purchased-gas cost adjustment Deferred Tax Assets, Regulatory Assets - purchased-gas cost adjustment Deferred Tax Assets, Regulatory Assets - purchased-gas cost adjustment us-gaap_CommonStockDividendsPerShareCashPaidQuaterly Common Stock, Dividends, Per Share, Cash Paid, Quarterly Common Stock, Dividends, Per Share, Cash Paid, Quarterly Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Other Deferred Compensation Arrangements, Liability, Current and Noncurrent Other Deferred Compensation Arrangements, Liability, Current and Noncurrent Customer deposits Increase (Decrease) in Customer Deposits Cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Transportation revenues [Member] Transportation revenues [Member] Transportation revenues represent revenue from contracts with customers through implied contracts established by our tariff rates approved by the regulatory authorities and tariff-based negotiated contracts. The customer receives the benefits of our performance when the commodity is delivered to the customer and the performance obligation is satisfied over time as the customer consumes the natural gas. Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share September 11, 2023 Equity Forward Agreement [Domain] September 11, 2023 Equity Forward Agreement [Member] September 11, 2023 Equity Forward Agreement Defined benefit plan, amortization of net loss (gain) Defined benefit plan, amortization of net loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Subsequent Event [Member] Subsequent Event [Member] Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Goodwill Goodwill Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Regulated Operation Regulated Operation [Member] Swap Swap [Member] Income taxes receivable Income Taxes Receivable Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted Average Number of Shares Outstanding, Basic [Abstract] Deferred Federal Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Auditor Name Auditor Name Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Regulatory assets and liabilities, current, net IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesCurrent IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesCurrent Other long-term debt, noncurrent, net of issuance costs Other Long-Term Debt, Noncurrent Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Forfeiture Rate Maximum In Hundredths Forfeiture Rate Maximum In Hundredths Forfeiture Rate Maximum In Hundredths Deferred MGP Costs, Maximum Deferred MGP Costs, Maximum Deferred MGP Costs, Maximum Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Net Regulatory Assets (Liabilities) Net Regulatory Assets Total Senior Unsecured Notes Total Senior Unsecured Notes [Member] Total Senior Unsecured Notes Variable Interest Entity Disclosure Variable Interest Entity Disclosure [Text Block] Payments of Debt Issuance Costs Payments of Debt Issuance Costs Regulatory liability, noncurrent Regulatory Liability, Noncurrent Regulatory Liability, Noncurrent Entity Address, State or Province Entity Address, State or Province Interest and Dividend Income, Operating Interest and Dividend Income, Operating Dividends, Common Stock Dividends, Common Stock Defined Benefit Plan, Expected Future Benefit Payment, Year Four Defined Benefit Plan, Expected Future Benefit Payment, Year Four Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Total current liabilities Liabilities, Current Other Current Liabilities Other Current Liabilities [Member] Lessee, Operating Lease, Option to Extend Lessee, Operating Lease, Option to Extend Proceeds from Income Tax Refunds Proceeds from Income Tax Refunds Dividends Subsequent Event Type [Domain] Dividends Subsequent Event Type [Domain] Dividends Subsequent Event Type [Domain] Defined Contribution Plan, Cost Defined Contribution Plan, Cost Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Other current assets and liabilities, net Increase (Decrease) in Other Current Assets and Liabilities, Net Derivatives Derivatives, Reporting of Derivative Activity [Policy Text Block] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Four Years Other current assets Other Assets, Current Document Annual Report Document Annual Report Entities [Table] Entities [Table] Entity [Domain] Entity [Domain] Defined Benefit Plan, Plan Assets, Payment for Settlement Defined Benefit Plan, Plan Assets, Payment for Settlement Cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Other regulatory assets, net [Member] Other regulatory assets [Member] Represents other regulatory assets. Interest Paid, Excluding Capitalized Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Accounting, Policy Basis of Accounting, Policy [Policy Text Block] Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Operating Lease, Cost Operating Lease, Cost KGSS-I Amortization of Intangible Asset KGSS-I Amortization of Securitized Intangible Asset KGSS-I Amortization of Securitized Intangible Asset Operating activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Net Regulatory Assets (Liabilities), Current Net regulatory assets and liabilities, current The net amount of all current regulatory assets less all current regulatory liabilities as of the end of the period. Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Defined Benefit Plan, Funded (Unfunded) Status of Plan Defined Benefit Plan, Funded (Unfunded) Status of Plan Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Goodwill and Intangible Assets, Policy Goodwill and Intangible Assets, Policy [Policy Text Block] Debt Instrument, Reference Rate Debt Instrument, Reference Rate Debt Instrument, Reference Rate Derivatives, Policy Derivatives, Policy [Policy Text Block] Segment Reporting Disclosure Segment Reporting Disclosure [Text Block] Repayment of securitized utility tariff bonds Repayments of securitized utility tariff bonds Repayments of securitized utility tariff bonds US Treasury Securities US Treasury Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement [Table] Disaggregation of Revenue [Table] Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Defined Benefit Plan, Plan Assets, Amount Defined Benefit Plan, Plan Assets, Amount Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Amortization of Rate Deferral Amortization of Rate Deferral Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Comprehensive Income (Loss) Note Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Depreciation and amortization Amortization of Intangible Assets Lessee, Leases Lessee, Leases [Policy Text Block] 8.00% Other Long Term Debt 8.00% Other Long Term Debt [Member] 8.00% Other Long Term Debt Short-term debt Commercial Paper Forward Contract Indexed to Equity, Settlement, Number of Shares Issued Forward Contract Indexed to Equity, Settlement, Number of Shares Issued Forward Contract Indexed to Equity, Settlement, Number of Shares Issued Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Outstanding Equity Forward Sale Agreements [Domain] Schedule of Outstanding Equity Forward Sale Agreements [Domain] Schedule of Outstanding Equity Forward Sale Agreements [Domain] Auditor [Table] Auditor [Table] Defined Benefit Plan, Expected Future Benefit Payment, Year Two Defined Benefit Plan, Expected Future Benefit Payment, Year Two Income tax receivable Increase (Decrease) in Income Taxes Receivable Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key Revenues Revenues Segment Reporting, Disclosure of Major Customers Segment Reporting, Disclosure of Major Customers Accounts Receivable Accounts Receivable [Policy Text Block] Amortization of EDIT Regulatory Liability - State Tax, Percent Amortization of EDIT Regulatory Liability - State Tax Effective Income Tax Rate Reconciliation, Percent Amortization of EDIT Regulatory Liability - State Tax Effective Income Tax Rate Reconciliation, Percent Nonqualified Plan Nonqualified Plan [Member] Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Forward Contract Indexed to At-the-Market Equity, Settlement, Number of Shares Forward Contract Indexed to At-the-Market Equity, Settlement, Number of Shares Forward Contract Indexed to At-the-Market Equity, Settlement, Number of Shares Equity Available for Issuance Equity Available for Issuance Equity Available for Issuance Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Equity and long-term debt Capitalization, Long-Term Debt and Equity [Abstract] Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Payments for Other Investing Activities Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Share-Based Payment Arrangement Share-Based Payment Arrangement [Text Block] Line of Credit Facility, Amount Outstanding Line of Credit Facility, Amount Outstanding Line of Credit Facility, Amount Outstanding Customer deposits Customer Deposits, Current Current maturities of securitized utility tariff bonds, net of issuance costs Current maturities of securitized utility tariff bonds Current maturities of securitized utility tariff bonds RequestedRefundFrom2022AmendedFederalTaxReturn RequestedRefundFrom2022AmendedFederalTaxReturn RequestedRefundFrom2022AmendedFederalTaxReturn Forward Contract Indexed to Issuer's Equity, Type [Axis] Forward Contract Indexed to Issuer's Equity, Type [Axis] Assets Assets [Abstract] Long-Term debt, excluding current maturities, total, net of issuance costs Long-term Debt, excluding current maturities, net of issuance costs Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Asset, Expected Amortization, Year Three Finite-Lived Intangible Asset, Expected Amortization, Year Three Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Number of natural gas distribution services customers Number of natural gas distribution services customers Number of customers the natural gas distribution service segment services. Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value Disclosures Fair Value Disclosures [Text Block] Employee Benefit Plans (Notes) Retirement Benefits [Text Block] Deferred Tax Liabilities, Regulatory Liabilities - purchased-gas cost adjustment Deferred Tax Liabilities, Regulatory Liabilities - purchased-gas cost adjustment Deferred Tax Liabilities, Regulatory Liabilities - purchased-gas cost adjustment Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Credit Facility [Domain] Credit Facility [Domain] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Weather normalization [Member] Weather normalization [Member] Weather normalization represents revenue over- or under-recovered through the weather normalization adjustment rider in Kansas. Entity Address, Address Line One Entity Address, Address Line One September 15, 2023 Equity Forward Agreement [Domain] September 15, 2023 Equity Forward Agreement [Member] September 15, 2023 Equity Forward Agreement Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Revenues Disaggregated by Source [Table] Revenue from External Customers by Products and Services [Table Text Block] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Debt Instrument, Interest Rate Terms Debt Instrument, Interest Rate Terms Entity Voluntary Filers Entity Voluntary Filers Tax effect of state income tax deduction Tax effect of state income tax deduction Tax effect of state income tax deduction Defined Benefit Plan, Benefits Paid Defined Benefit Plan, Benefits Paid Defined Benefit Plan, Benefits Paid Defined benefit plan, amortization of unrecognized prior service cost (credit) Defined benefit plan, amortization of unrecognized prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Ratio of Indebtedness to Net Capital Excluding KGSS-I debt Ratio of Indebtedness to Net Capital Excluding KGSS-I debt Indebtedness, excluding KGSS-I debt, divided by net capital Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period (Decrease) Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Decrease Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Decrease Other Liabilities Other Liabilities [Member] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Retained Earnings, Unappropriated Retained Earnings, Unappropriated Net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Alternative Investments Alternative Investments [Member] Alternative Investments Interest Expense Interest Expense, Other Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Regulated operating revenue Regulated Operating Revenue Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Defined benefit plan, reclassification adjustment, before tax and regulatory adjustments Defined benefit plan, reclassification adjustment, before tax and regulatory adjustments Defined benefit plan, reclassification adjustment, before tax and regulatory adjustments Document Quarterly Report Document Quarterly Report Deferred Income Taxes and Tax Credits Deferred Income Taxes and Tax Credits Long-term Debt, Fair Value Long-Term Debt, Fair Value Amortization of EDIT Regulatory Liability, Percent Amortization of EDIT Regulatory Liability, Percent Amortization of EDIT Regulatory Liability, Percent Kansas Gas Service Securitization I LLC Kansas Gas Service Securitization I LLC [Member] Kansas Gas Service Securitization I LLC Interest cost Defined Benefit Plan, Interest Cost Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Defined Benefit Plan, Expected Future Benefit Payment, Year Three Defined Benefit Plan, Expected Future Benefit Payment, Year Three Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold Indebtedness threshold considered an event of default as stipulated in our Senior Note indenture. REVENUE [Axis] REVENUE [Axis] Revenues disaggregated by source. Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Forward Contract Indexed to Issuer's Equity, Indexed Shares Forward Contract Indexed to Equity, Settlement, Number of Shares Deferred Tax Liabilities, Leasing Arrangements Deferred Tax Liabilities, Leasing Arrangements Interest Income Interest Income, Other Defined Benefit Plan, Plan Assets, Expected Long-Term Rate-of-Return, Description Defined Benefit Plan, Plan Assets, Expected Long-Term Rate-of-Return, Description Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Sale of Stock [Axis] Sale of Stock [Axis] Regulatory Asset [Axis] Regulatory Asset [Axis] Materials and supplies Materials, Supplies, and Other All Award Types Award Type [Domain] Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Three Years Schedule of Forward Contracts Indexed to Issuer's Equity Schedule of Forward Contracts Indexed to Issuer's Equity [Table Text Block] EARNINGS PER SHARE [Line Items] EARNINGS PER SHARE OF COMMON STOCK, BASIC AND DILUTED [Line Items] [Line Items] for Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] [Line Items] for Disclosure of commitments and contingencies [Table] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] 4.25% Senior Unsecured Notes Due 2032 4.25% Senior Unsecured Notes Due 2032 [Member] 4.25% Senior Unsecured Notes Due 2032 Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Retirement Plan Type [Domain] Retirement Plan Type [Domain] Variable Interest Entity, Measure of Activity, Net Income Variable Interest Entity, Measure of Activity, Net Income Variable Interest Entity, Measure of Activity, Net Income Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Regulatory assets, noncurrent Regulatory assets, noncurrent Regulatory Asset, Noncurrent Employee Stock Employee Stock [Member] Schedule of Amounts Recognized in Other Comprehensive Income (Loss) Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] RefundFromAmendedOklahomaCorporateIncomeTaxReturn RefundFromAmendedOklahomaCorporateIncomeTaxReturn RefundFromAmendedOklahomaCorporateIncomeTaxReturn Deferred Tax Liabilities, Winter weather events Deferred Tax Liabilities, Regulatory Assets and Liabilities - winter weather event costs Deferred Tax Liabilities, Regulatory Assets and Liabilities - winter weather event costs Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Fixed Income Funds Fixed Income Funds [Member] Approved Debt to Capital Ratio Approved Debt to Capital Ratio Approved Debt to Capital Ratio Financial Instruments [Domain] Financial Instruments [Domain] Schedule Of Employee Pension Plans Investments At Fair Value Schedule Of Employee Pension Plans Investments At Fair Value [Table Text Block] Schedule Of Employee Pension Plans Investments At Fair Value OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Deferred Tax Liabilities, Gross Deferred Tax Liabilities, Gross Auditor Firm ID Auditor Firm ID Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Performance Shares Performance Shares [Member] Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Number Of Former Manufactured Gas Sites Where We Own Or Retain Legal Responsibility For Environmental Conditions Number Of Former Manufactured Gas Sites Where We Own Or Retain Legal Responsibility For Environmental Conditions Number of former manufactured gas sites where we own or retain legal responsibility. Defined Benefit Plan, Benefit Obligation Defined Benefit Plan, Benefit Obligation Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] 401k Plan 401k Plan [Member] 401k Plan Natural gas in storage Increase (Decrease) in Inventories Defined Benefit Plan, Benefit Obligation, Payment for Settlement Defined Benefit Plan, Benefit Obligation, Payment for Settlement Minimum [Member] Minimum [Member] Miscellaneous revenues [Member] Miscellaneous revenues [Member] Miscellaneous revenues from contracts with customers represent implied contracts established by our tariff rates approved by the regulatory authorities and includes one-time miscellaneous service charges with the performance obligation satisfied at a point in time when services are rendered to the customer. Goodwill and other assets Assets, Noncurrent [Abstract] Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Revenue [Policy Text Block] Revenue [Policy Text Block] Cost of Goods and Service Cost of Goods and Service [Policy Text Block] Other noncurrent assets and liabilities, net Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Accounts payable Accounts Payable, Current Interest Payable Interest Payable Operating Lease, Payments Operating Lease, Payments Net Income (Loss) Available to Common Stockholders, Diluted Net Income (Loss) Available to Common Stockholders, Diluted Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 62,761,990 shares at March 31, 2026; issued and outstanding 62,692,392 shares at December 31, 2025 Common Stock, Value, Issued Short-Term Investments Short-Term Investments COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase Short-Term Debt, Weighted Average Interest Rate, at Point in Time Short-Term Debt, Weighted Average Interest Rate, at Point in Time Segments Segment Reporting, Policy [Policy Text Block] Commitments and contingencies Commitments and Contingencies Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Long-term Debt [Text Block] Long-Term Debt [Text Block] Document Transition Report Document Transition Report Borrowings (repayments) of short-term debt, net Proceeds from (Repayments of) Commercial Paper Repayments of Other Long-Term Debt Repayments of Other Long-Term Debt March 2026 At-The-Market Equity Program [Member] March 2026 At-The-Market Equity Program [Member] March 2026 At-The-Market Equity Program Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Schedule of Outstanding Equity Forward Sale Agreements [Axis] Schedule of Outstanding Equity Forward Sale Agreements [Axis] Schedule of Outstanding Equity Forward Sale Agreements Regulatory Asset for Costs Associated with Manufactured Gas Sites Regulatory Asset for Costs Associated with Manufactured Gas Sites Regulatory Asset for Costs Associated with Manufactured Gas Sites Income Tax Disclosure Income Tax Disclosure [Text Block] Diluted EPS Calculation Earnings Per Share, Diluted [Abstract] Nonservice Costs Member Nonservice Costs [Member] Nonservice Costs SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Table] SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Table] Tabular disclosure of assets and liabilities that result from rate actions of a regulator. Regulatory assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Additional Forward Contract Indexed To Issuers Equity, Additional Shares Option, Number of Shares Forward Contract Indexed to Equity, Additional Shares Option, Number of Shares Forward Contract Indexed to Equity, Additional Shares Option, Number of Shares Scenario [Axis] Scenario [Axis] Other Income and Other Expense Disclosure [Text Block] Other Nonoperating Income and Expense [Text Block] SCHEDULE OF REGULATED ASSETS AND LIABILITIES SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Table Text Block] [Table Text Block] for Tabular disclosure of assets and liabilities that result from rate actions of a regulator. Regulatory assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Document Type Document Type K2 Institutional Investors I I Limited Partnership K2 Institutional Investors I I Limited Partnership [Member] K2 Institutional Investors I I Limited Partnership Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share [Text Block] Earnings Per Share [Text Block] Paid-in capital Additional Paid in Capital Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Schedule of Defined Benefit Plans Disclosures Schedule of Defined Benefit Plans Disclosures [Table Text Block] Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Defined Benefit Plan, Expected Future Benefit Payment, Year Five Defined Benefit Plan, Expected Future Benefit Payment, Year Five Proceeds from Sale of Other Assets, Investing Activities Proceeds from Sale of Other Assets, Investing Activities SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] [Line Items] for Tabular disclosure of assets and liabilities that result from rate actions of a regulator. Regulatory assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Accumulated depreciation and amortization Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Fair Value Disclosures [Abstract] Accounts receivable Increase (Decrease) in Receivables Capital expenditures Payments to Acquire Property, Plant, and Equipment General taxes Utilities Operating Expense, Taxes Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Common Stock, Dividends, Declared, Annualized Basis Common Stock, Dividends, Declared, Annualized Basis Dividends declared during the period for each share of common stock outstanding, on an annualized basis. Regulatory Asset [Domain] Regulatory Asset [Domain] Securitization Customer Charges Securitization Customer Charges [Member] Securitization Customer Charges Deferred Tax Assets, Leasing Arrangements Deferred Tax Assets, Leasing Arrangements Deferred Tax Assets, Leasing Arrangements Payment, Tax Withholding, Share-based Payment Arrangement Payment, Tax Withholding, Share-Based Payment Arrangement Under-recovered purchased-gas costs [Member] Under-recovered purchased-gas costs [Member] Represents the amount of under-recovered purchased-gas costs [Member] 4.658% Senior Unsecured Notes Due 2044 4.658% Senior Unsecured Notes Due 2044 [Member] 4.658% Senior Unsecured Notes Due 2044 OGS: Income Tax of Deferred Carrying Cost (a) Income Tax Expense (Benefit) of Deferred Carrying Cost (non-GAAP) Income Tax Expense (Benefit) of Deferred Carrying Cost (non-GAAP) OTHER INCOME AND OTHER EXPENSE [Axis] OTHER INCOME AND OTHER EXPENSE [Axis] Detail of other income and other expense. Defined benefit plan, regulatory adjustments Defined benefit plan, regulatory adjustments Other comprehensive income (loss) reclassification - Regulatory adjustments represent pension and other postretirement benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets. Regulatory assets, current Regulatory assets, current Regulatory Asset, Current Entity Information [Line Items] Entity Information [Line Items] Developed Foreign Equities Developed Foreign Equities [Member] Developed Foreign Equities Current liabilities Liabilities, Current [Abstract] Short-term Debt [Line Items] Line of Credit Facility [Line Items] OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax Lessee Operating Lease Minimum Term Of Contract Lessee Operating Lease Minimum Term Of Contract Lessee Operating Lease Minimum Term Of Contract Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Utilities Operating Expense Operating Expenses Deferred Tax Assets, Regulatory adjustments Deferred Tax Assets, Regulatory adjustments Deferred Tax Assets, Regulatory adjustments Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Two Years Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Diluted Earnings Per Share, Diluted Earnings Per Share, Diluted Cash and Money Market Funds Cash and Money Market Funds [Member] Cash and Money Market Funds Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Natural gas sales to customers [Member] Natural gas sales to customers [Member] Natural gas sales to customers represent revenue from contracts with customers through implied contracts established by our tariff rates approved by the regulatory authorities and includes residential, commercial, industrial, wholesale and public authority customers. For natural gas sales, the customer receives the benefits of our performance when the commodity is received and simultaneously consumed by the customer. The performance obligation is satisfied over time as the customer consumes the natural gas. Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Defined Benefit Plan, Assumptions Defined Benefit Plan, Assumptions [Table Text Block] Proceeds from Securitization Bonds, Operating Activities Proceeds from Securitization Bonds, Operating Activities Proceeds from Securitization Bonds, Operating Activities Investments At Fair Value Hierarchy Total [Domain] Investments At Fair Value Hierarchy Total [Member] Investments At Fair Value Hierarchy Total Dividends [Axis] Dividends [Axis] Earnings per share Earnings Per Share [Abstract] Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received Proceeds from Advance for and Contribution in Aid of Construction, Financing Activity Proceeds from Advance for and Contribution in Aid of Construction, Financing Activity Auditor Location Auditor Location Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Domestic Tax Jurisdiction Domestic Tax Jurisdiction [Member] Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Regulatory Liability [Domain] Regulatory Liability [Domain] Percent of employees who participated in the Employee Stock Purchase Plan Percent of employees who participated in the Employee Stock Purchase Plan Percent of employees who participated in the Employee Stock Purchase Plan 5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032 5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032 [Member] 5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032 Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Cash Surrender Value of Life Insurance Cash Surrender Value of Life Insurance DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMaximum DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMaximum Proceeds from Settlement of Forward Contract Indexed to Issuer's Equity Proceeds from Settlement of Forward Contract Indexed to Issuer's Equity Proceeds from Settlement of Forward Contract Indexed to Issuer's Equity Corporate Bond Securities Corporate Bond Securities [Member] Reacquired debt costs [Member] Loss on Reacquired Debt [Member] Finite-Lived Intangible Asset, Expected Amortization, Year Two Finite-Lived Intangible Asset, Expected Amortization, Year Two OGS: Adjusted Net Income Non-GAAP Adjusted Net Income (non-GAAP) [Table Text Block] OGS: Adjusted Net Income Non-GAAP Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Expense Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Expense Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Expense Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] IRS 2022 Federal Income Tax Return IRS 2022 Federal Income Tax Return IRS 2022 Federal Income Tax Return Service cost Defined Benefit Plan, Service Cost Long-term Debt, Gross Long-Term Debt, Gross Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Property, Plant and Equipment Disclosure Property, Plant and Equipment Disclosure [Text Block] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Lessee, Operating Lease, Liability, to be Paid Lessee, Operating Lease, Liability, to be Paid Investment, Basis Spread, Variable Rate Investment, Basis Spread, Variable Rate Stockholders' Equity Note Disclosure [Text Block] Equity [Text Block] Deferred State and Local Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum Net income Net income Net income available for common stock Net Income (Loss) Attributable to Parent Dividends [Domain] Dividends [Domain] Schedule of Net Periodic Benefit Cost Not yet Recognized Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Deferred credits and other liabilities Liabilities, Noncurrent [Abstract] Net property, plant and equipment Public Utilities, Property, Plant and Equipment, Net Construction in Progress Construction in Progress [Member] Finite-Lived Intangible Asset, Expected Amortization, Year Five Finite-Lived Intangible Asset, Expected Amortization, Year Five Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Property, Plant and Equipment, Net Property, Plant and Equipment, Net Other Investments 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diluted per-share computations for income from continuing operations. 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IRS 2022 Income Tax Return, Federal Income Tax IRS 2022 Income Tax Return, Federal Income Tax IRS 2022 Income Tax Return, Federal Income Tax Accounts receivable, net Receivables, Net, Current Over-recovered purchased-gas costs [Member] Over-recovered purchased-gas costs [Member] Represents the amount of over-recovered purchased-gas costs. Document [Domain] Document [Domain] Asset removal costs Increase (Decrease) Asset Removal Costs Increase (Decrease) Asset Removal Costs Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Forward Contract Indexed to Equity, Settlement, Cash, Amount Forward Contract Indexed to Equity, Settlement, Cash, Amount Government Obligations Government Obligations [Member] Government Obligations Amendment Flag Amendment Flag Share-Based Payment Arrangement, Expense, Tax Benefit Share-Based Payment Arrangement, Expense, Tax Benefit Unrealized gain (loss) on marketable equity securities Unrealized gain (loss) on marketable equity securities [Member] Unrealized gain (loss) on marketable equity securities ONE Gas Postretirement Benefit Plans [Member] Other Postretirement Benefits Plan [Member] Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Lessee, Operating Leases Lessee, Operating Leases [Text Block] 5.10% Senior Unsecured Notes Due 2029 [Member] 5.10% Senior Unsecured Notes Due 2029 [Member] 5.10% Senior Unsecured Notes Due 2029 Cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Income tax rate changes [Member] [Domain] Income tax rate changes [Member] [Domain] Income tax rate changes [Member] [Domain] Finite-Lived Intangible Asset, Expected Amortization, after Year Five Finite-Lived Intangible Asset, Expected Amortization, after Year Five Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Accrued interest Accrued interest [Member] Accrued interest Basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Forward Contract Indexed to Equity, Settlement, Original Number of Shares Forward Contract Indexed to Equity, Settlement, Original Number of Shares Forward Contract Indexed to Equity, Settlement, Original Number of Shares Debt Instrument, Covenant Compliance, Default Provision, Debt Holders Debt Instrument, Covenant Compliance, Default Provision, Debt Holders Debt Instrument, Covenant Compliance, Default Provision - Threshold of percentage held, of the aggregate principal amount of outstanding Senior Notes, to declare acceleration of repayment upon an event of default. Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant accounting policies of the reporting entity. Income Tax Paid, Oklahoma, after Refund Received Income Tax Paid, Oklahoma, after Refund Received Income Tax Paid, Oklahoma, after Refund Received Cost of natural gas Cost of Product and Service Sold Ad valorem tax [Member] Ad valorem tax [Member] Ad valorem tax represents an increase in Kansas Gas Service’s taxes above the amount approved in a rate case. Kansas law permits a utility to file a tariff to recover additional ad valorem tax expense incurred above the amount currently recovered in the cost of service rate. This excess amount is recoverable through a surcharge and can be recovered, provided the utility reports the change in rates to the KCC, on an annual basis. Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Number of sites with ongoing groundwater monitoring Number of sites with ongoing groundwater monitoring Number of sites where groundwater continues to be monitored in accordance to plans approved by the KDHE. Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Land, Buildings and Improvements Land, Buildings and Improvements [Member] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Segment Reporting [Abstract] DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Line of Credit Facility Sublimit Line of Credit Facility Sublimit This item represents the amount of sublimit for the issuance of standby letters of credit. Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Reclassification from AOCI, Current Period, Tax Reclassification from AOCI, Current Period, Tax CommercialPaperMaximumMaturityTerm CommercialPaperMaximumMaturityTerm CommercialPaperMaximumMaturityTerm Defined benefit plan, reclassification from AOCI, Current Period, before Tax, Attributable to Parent Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Regulated Operating Revenue, Other Regulated Operating Revenue, Other Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Line of Credit Facility Option to Increase Borrowing Capacity Line of Credit Facility Option to Increase Borrowing Capacity This item represents the total amount the facility my increase to. Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Premiums recorded in other current assets on natural gas contracts held Premiums recorded in other current assets on natural gas contracts held The amount of premiums recorded in other current assets on natural gas contracts held Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares, Issued Shares issued, beginning balance Shares issued, ending balance Common Stock, Shares, Issued Total deferred credits and other liabilities Liabilities, Other than Long-Term Debt, Noncurrent Common Stock Authorized and Available for Issuance Common Stock Authorized and Available for Issuance Common Stock Authorized and Available for Issuance Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Regulatory Liabilities Regulatory Liability Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Aggregate Offering Price Limit At-the-Market Equity Program, Aggregate Offering Price Limit At-the-Market Equity Program, Aggregate Offering Price Limit Use of Estimates Use of Estimates, Policy [Policy Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Liability, Defined Benefit Plan, Current Liability, Defined Benefit Plan, Current Forward Contract Indexed to Equity, Shares with Extended Maturity Date Forward Contract Indexed to Equity, Shares with Extended Maturity Date Forward Contract Indexed to Equity, Shares with Extended Maturity Date Regulatory Assets Regulatory Asset Dividends paid Payments of Dividends Entity Public Float Entity Public Float Securitized utility tariff bonds Securitized utility tariff bonds Securitized utility tariff bonds Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Security Exchange Name Security Exchange Name Regulatory liability, current Regulatory Liability, Current Regulatory Liability, Current Equity Securities Equity Securities [Member] Regulated Operating Revenue, Gas Regulated Operating Revenue, Gas Other Information Related to Operating Leases Table Text Block Other Information Related to Operating Leases Table Text Block [Table Text Block] Other Information Related to Operating Leases Table Text Block Variable Interest Entity, Measure of Activity, Income Tax Variable Interest Entity, Measure of Activity, Income Tax Variable Interest Entity, Measure of Activity, Income Tax Regulated and Unregulated Operation [Domain] Regulated and Unregulated Operation [Domain] Tax effect of permanent differences Tax effect of permanent differences Tax effect of permanent differences Capital Expenditures Incurred but Not yet Paid Capital Expenditures Incurred but Not yet Paid Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Other revenues - natural gas sales related [Member] Other revenues - natural gas sales related [Member] Other revenues - natural gas sales related [Member] Operating expenses Operating Expenses [Abstract] Other current liabilities Other Liabilities, Current Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Employee benefit obligations Liability, Defined Benefit Plan, Noncurrent Share price of shares sold under Employee Stock Purchase Plan in dollars per share Share price of shares sold under Employee Stock Purchase Plan in dollars per share Share price of shares sold under Employee Stock Purchase Plan in dollars per share Components of net periodic benefit cost: Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] Operations and maintenance Utilities Operating Expense, Maintenance and Operations Common stock issued, value Stock Issued During Period, Value, New Issues Statement [Line Items] Statement [Line Items] Small Cap Equities Small Cap Equities [Member] Small Cap Equities Forward Contract Indexed to At-the-Market Equity, Settlement, Cash, Amount Forward Contract Indexed to At-the-Market Equity, Settlement, Cash, Amount Forward Contract Indexed to At-the-Market Equity, Settlement, Cash, Amount Natural gas in storage Energy Related Inventory, Natural Gas in Storage Cash and cash equivalents Cash and Cash Equivalent Customer credit deferrals Customer credit deferrals [Member] Customer credit deferrals Common Stock [Member] Common Stock [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Discounts and issuance costs for securitized utility tariff bonds, excluding current maturities Discounts and issuance costs for securitized utility tariff bonds, excluding current maturities Discounts and issuance costs for securitized utility tariff bonds, excluding current maturities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Amortization of EDIT Regulatory Liability - State Tax Amortization of EDIT Regulatory Liability - State Tax Amortization of EDIT Regulatory Liability - State Tax Pension and other postemployment benefits Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Effect of dilutive securities on shares Weighted Average Number of Shares Outstanding, Diluted, Adjustment Securitized utility tariff bonds, excluding current maturities, net of issuance costs Securitized utility tariff bonds, excluding current maturities, net of issuance costs Securitized utility tariff bonds, excluding current maturities, net of issuance costs