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EMPLOYEE BENEFIT PLANS (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2022
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 23,000,000 | $ 259,300,000 |  |
Amortization of unrecognized prior service cost | (525,000) | (289,000) | $ 279,000 |
Amortization of net (gain) loss | $ (1,960,000) | $ (17,010,000) | $ (45,896,000) |
DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum | 4.30% | 5.00% |  |
Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits |  | 5 years |  |
DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum | 3.50% | 3.60% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate |  | 3.05% |  |
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum | 5.00% | 5.00% | 3.90% |
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum | 3.60% | 3.10% | 3.10% |
DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateAfterRemeasurement |  | 4.55% |  |
Defined Benefit Plan, Plan Assets, Expected Long-Term Rate-of-Return, Description | We determine our discount rates annually. We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our defined benefit pension and other postemployment obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows. Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds. Bonds selected to be included in the portfolios are only those rated by Moody’s as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds. |  |  |
Regulatory assets, Noncurrent | $ 287,906,000 | $ 330,831,000 |  |
Employee benefit obligations | 20,265,000 | 19,587,000 |  |
AdjustmentToPensionExpenseDueToRemeasurement |  |  |  | $ 7,200,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 478,000 | (5,823,000) | $ (1,250,000) |
Regulatory Assets | $ 363,214,000 | $ 606,403,000 |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year | 6.00% | 6.50% |  |
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate | 2030 | 2030 |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 12,600,000 | $ 10,900,000 | 9,900,000 |
Ultimate Trend Rate, Current Year |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 4.50% |  |  |
Ultimate Trend Rate, Prior Year |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate |  | 4.50% |  |
Grosvenor Registered Multi Limited Partnership |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 40,872,000 | $ 40,160,000 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 | $ 0 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | quarterly | quarterly |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description | 65 | 65 |  |
K2 Institutional Investors I I Limited Partnership |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 48,254,000 | $ 46,871,000 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 | $ 0 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | quarterly | quarterly |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description | 91 | 91 |  |
Investment grade bonds |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 70.00% |  |  |
US Large Cap Equity |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 13.00% |  |  |
Alternative Investments |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 7.00% |  |  |
Developed Foreign Large Cap Equities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |  |  |
Mid Cap Equities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 3.00% |  |  |
Emerging Market Equities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 1.00% |  |  |
Small Cap Equities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 1.00% |  |  |
Fixed Income Funds |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 90 percent |  |  |
Equity Securities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 10 percent |  |  |
Nonservice Costs Member |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Regulatory assets, Noncurrent | $ 2,200,000 | $ 2,800,000 |  |
ONE Gas Pension Plans [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 7,242,000 | 10,369,000 | 13,811,000 |
Interest cost | 42,428,000 | 36,150,000 | 29,458,000 |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 0 | 0 |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 23,015,000 | (259,261,000) |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (53,713,000) | (55,326,000) |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 2,711,000 |  |
Expected return on assets | (59,518,000) | (58,528,000) | (62,382,000) |
Amortization of unrecognized prior service cost | 372,000 | 248,000 | 0 |
Amortization of net (gain) loss | 2,008,000 | 16,793,000 | 45,523,000 |
Net periodic benefit cost | $ (7,468,000) | $ 5,032,000 | $ 26,410,000 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.30% | 5.60% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 5.60% |  | 2.80% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets | 6.75% | 6.40% | 7.15% |
Defined Benefit Plan, Benefit Obligation | $ 803,605,000 | $ 784,633,000 | $ 1,049,990,000 |
Defined Benefit Plan, Plan Assets, Amount | 795,381,000 | 768,961,000 | 1,013,244,000 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (8,224,000) | (15,672,000) |  |
Assets for Plan Benefits, Defined Benefit Plan | 13,409,000 | 5,267,000 |  |
Liability, Defined Benefit Plan, Current | (1,368,000) | (1,352,000) |  |
Employee benefit obligations | (20,265,000) | (19,587,000) |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (8,224,000) | (15,672,000) |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 78,827,000 | (190,484,000) |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1,306,000 | 1,527,000 |  |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 0 | 0 |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | (53,713,000) | (55,326,000) |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 772,100,000 | 746,800,000 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 1,400,000 |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | (619,000) | 7,369,000 | 67,000 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 1,000 | 159,000 | 1,562,000 |
Increase (Decrease) in Deferred Income Taxes | 140,000 | (1,705,000) | (379,000) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | (478,000) | 5,823,000 | 1,250,000 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | (2,091,000) | (2,463,000) |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | (246,988,000) | (245,290,000) |  |
DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes | (249,079,000) | (247,753,000) |  |
Regulatory Assets | 247,684,000 | 246,975,000 |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | (1,395,000) | (778,000) |  |
Deferred Tax Liabilities, Regulatory Assets | 213,000 | 74,000 |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (1,182,000) | (704,000) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 101,476,000 | 101,511,000 | 108,757,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) | 2,095,000 | 1,467,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,562,000 | 3,215,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (3,074,000) | (4,470,000) |  |
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodDecrease | (618,000) | (7,458,000) |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year One | 55,391,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 55,988,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 56,422,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 56,591,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 57,296,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years | 286,471,000 |  |  |
ONE Gas Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 93,777,000 | 154,493,000 |  |
ONE Gas Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 600,128,000 | 512,957,000 |  |
ONE Gas Pension Plans [Member] | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 101,476,000 | 101,511,000 |  |
ONE Gas Pension Plans [Member] | Equity Securities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 88,477,000 | 150,027,000 |  |
ONE Gas Pension Plans [Member] | Equity Securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 88,477,000 | 150,027,000 |  |
ONE Gas Pension Plans [Member] | Equity Securities | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Equity Securities | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Government Obligations |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 204,669,000 | 160,799,000 |  |
ONE Gas Pension Plans [Member] | Government Obligations | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Government Obligations | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 204,669,000 | 160,799,000 |  |
ONE Gas Pension Plans [Member] | Government Obligations | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Corporate Obligations |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 366,482,000 | 329,973,000 |  |
ONE Gas Pension Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 366,482,000 | 329,973,000 |  |
ONE Gas Pension Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Cashand Money Market Funds |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 34,277,000 | 26,651,000 |  |
ONE Gas Pension Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 5,300,000 | 4,466,000 |  |
ONE Gas Pension Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 28,977,000 | 22,185,000 |  |
ONE Gas Pension Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Insurance Contracts and Group Annuity Contracts |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,350,000 | 14,480,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 12,350,000 | 14,480,000 | 17,301,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) | 0 | 1,467,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1,562,000 | 182,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (3,074,000) | (4,470,000) |  |
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodDecrease | (618,000) | 0 |  |
ONE Gas Pension Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,350,000 | 14,480,000 |  |
ONE Gas Pension Plans [Member] | Other Investments |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 89,126,000 | 87,031,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 89,126,000 | 87,031,000 | 91,456,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) | 2,095,000 | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | 3,033,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | 0 |  |
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodDecrease | 0 | (7,458,000) |  |
ONE Gas Pension Plans [Member] | Other Investments | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Other Investments | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Pension Plans [Member] | Other Investments | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 89,126,000 | 87,031,000 |  |
ONE Gas Postretirement Benefit Plans [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 730,000 | 1,274,000 | 1,587,000 |
Interest cost | 9,154,000 | 6,448,000 | 6,251,000 |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 2,823,000 | 3,035,000 |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (5,551,000) | (48,609,000) |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (16,963,000) | (16,612,000) |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 |  |
Expected return on assets | (9,728,000) | (13,181,000) | (16,807,000) |
Amortization of unrecognized prior service cost | 153,000 | 41,000 | (279,000) |
Amortization of net (gain) loss | (48,000) | 217,000 | 373,000 |
Net periodic benefit cost | $ 261,000 | $ (5,201,000) | $ (8,875,000) |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.40% | 5.70% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 5.70% | 3.00% | 2.70% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets | 5.55% | 5.85% | 7.50% |
Defined Benefit Plan, Benefit Obligation | $ 158,535,000 | $ 168,342,000 | $ 222,806,000 |
Defined Benefit Plan, Plan Assets, Amount | 181,608,000 | 181,877,000 | 231,994,000 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 23,073,000 | 13,535,000 |  |
Assets for Plan Benefits, Defined Benefit Plan | 23,073,000 | 13,535,000 |  |
Liability, Defined Benefit Plan, Current | 0 | 0 |  |
Employee benefit obligations | 0 | 0 |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 23,073,000 | 13,535,000 |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 11,325,000 | (38,432,000) |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 2,546,000 | 1,892,000 |  |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 2,823,000 | 3,035,000 |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | (16,963,000) | (16,612,000) |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 0 |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 0 | 0 | 0 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 0 | (153,000) |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | (1,457) | (8,557,000) |  |
DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes | (1,457) | (8,710,000) |  |
Regulatory Assets | 1,457 | 8,710,000 |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 0 | 0 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year One | 14,127,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 13,890,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 13,505,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 13,194,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 12,848,000 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years | 59,299,000 |  |  |
ONE Gas Postretirement Benefit Plans [Member] | Equity Securities |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 7,031,000 | 5,983,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Equity Securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 7,031,000 | 5,983,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Equity Securities | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Equity Securities | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Government Obligations |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 41,863,000 | 43,291,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Government Obligations | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Government Obligations | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 41,863,000 | 43,291,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Government Obligations | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Corporate Obligations |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 38,615,000 | 38,095,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 38,615,000 | 38,095,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Corporate Obligations | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Cashand Money Market Funds |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 13,996,000 | 8,371,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 751,000 | 750,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 13,245,000 | 7,621,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Cashand Money Market Funds | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Insurance Contracts and Group Annuity Contracts |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 80,102,000 | 86,137,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 80,102,000 | 86,137,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Insurance Contracts and Group Annuity Contracts | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |  |
ONE Gas Postretirement Benefit Plans [Member] | Other Investments |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 181,607,000 | 181,877,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Other Investments | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 7,782,000 | 6,733,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Other Investments | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 173,825,000 | 175,144,000 |  |
ONE Gas Postretirement Benefit Plans [Member] | Other Investments | Fair Value, Inputs, Level 3 |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | 0 |  |
401k Plan |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |  |
Defined Contribution Plan, Cost | $ 16,700,000 | $ 15,300,000 | $ 14,300,000 |

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