SHARE-BASED PAYMENTS (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Feb. 03, 2014
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Jan. 31, 2014
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Share-based Payments [Line Items] |
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Share Price |
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$ 68.22ogs_VolumeweightedaveragesharepriceofONEOKstockonJanuary312014 |
Volume-weighted average share price of ONE Gas stock on February 3, 2014 |
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$ 33.50ogs_VolumeweightedaveragesharepriceofONEGasstockonFebruary32014 |
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Employee Stock Award Program Compensation Expense |
$ 7,613,000us-gaap_ShareBasedCompensation |
$ 0us-gaap_ShareBasedCompensation |
$ 0us-gaap_ShareBasedCompensation |
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Employee Stock Purchase Plan [Member] |
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Share-based Payments [Line Items] |
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Description |
Subject to certain exclusions, all employees who work at least 20 hours per week are eligible to participate in the ESPP. Employees can choose to have up to 10 percent of their annual base pay withheld to purchase our common stock, subject to terms and limitations of the plan. The purchase price of the stock is 85 percent of the lower of the average market price of our common stock on the grant date or exercise date. |
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Employee Stock Award Program [Member] |
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Share-based Payments [Line Items] |
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Description |
Under the program, each time the per-share closing price of our common stock on the NYSE closed for the first time at or above each $1.00 increment above its previous historical high closing price, we issued, for no monetary consideration, one share of our common stock to all eligible employees. |
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Restricted Stock Units (RSUs) [Member] |
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Share-based Payments [Line Items] |
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Share-based awards conversion ratio upon separation |
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2.04%ogs_Sharebasedawardsconversionratiouponseparation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Award vesting period |
3 years |
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Forfeiture rate maximum (in hundredths) |
3.00%ogs_ForfeitureRateMaximumInHundredths / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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Total compensation cost not yet recognized |
2,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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Total compensation cost not yet recognized, period for recognition |
1 year 9 months 18 days |
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Performance Unit Awards [Member] |
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Share-based Payments [Line Items] |
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Share-based awards conversion ratio upon separation |
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2.04%ogs_Sharebasedawardsconversionratiouponseparation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Award vesting period |
3 years |
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Forfeiture rate maximum (in hundredths) |
3.00%ogs_ForfeitureRateMaximumInHundredths / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
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Total compensation cost not yet recognized |
4,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
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Total compensation cost not yet recognized, period for recognition |
1 year 8 months 12 days |
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Employee Stock Purchase Plan [Member] |
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Share-based Payments [Line Items] |
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Common Stock, Capital Shares Reserved for Future Issuance |
700,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Maximum allowable percentage of annual base pay withheld to purchase common stock |
10.00%ogs_MaximumAllowablePercentageOfAnnualBasePayWithheldToPurchaseOurCommonStock / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Purchase price percentage of the lower of its grant date or exercise date market price (in hundredths) |
85.00%ogs_PurchasePricePercentageOfLowerOfItsGrantDateOrExerciseDateMarketPriceInHundredths / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Percent of employees who participated in the Employee Stock Purchase Plan |
36.00%ogs_PercentofemployeeswhoparticipatedintheEmployeeStockPurchasePlan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Shares sold under employee stock purchase plan |
51,418ogs_Sharessoldunderemployeestockpurchaseplan / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Share price of shares sold under Employee Stock Purchase Plan in dollars per share |
$ 32.29ogs_SharepriceofsharessoldunderEmployeeStockPurchasePlanindollarspershare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Employee Stock Purchase Plan Compensation Expense |
400,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
2,700,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
800,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
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Employee Stock Award Program [Member] |
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Share-based Payments [Line Items] |
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Shares issued to employees under the Employee Stock Award Program |
35,324ogs_SharesissuedtoemployeesundertheEmployeeStockAwardProgram / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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Employee Stock Award Program Compensation Expense |
2,500,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
4,200,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
1,200,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |
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ONEGAS Plan [Member] |
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Share-based Payments [Line Items] |
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Common Stock, Capital Shares Reserved for Future Issuance |
2,800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Share-based compensation expense, net of tax |
7,000,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Share-based compensation, tax benefit |
4,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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ONEGAS Plan [Member] | Restricted Stock Units (RSUs) [Member] |
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Share-based Payments [Line Items] |
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Released to participants prior to separation, number |
0ogs_Releasedtoparticipantspriortoseparationnumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Released to participants prior to separation, weighted average fair value |
$ 0.00ogs_Releasedtoparticipantspriortoseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Cancelled and replaced upon separation, number |
(246,683)ogs_Cancelledandreplaceduponseparationnumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Cancelled and replaced upon separation, weighted average fair value |
$ 19.71ogs_Cancelledandreplaceduponseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested beginning balance (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested beginning balance (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Granted (in units) |
94,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Weighted -average grant date fair value (per unit) |
$ 33.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Released to participants (in units) |
(7,217)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Released to participants (in dollars per unit) |
$ 19.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Forfeited (in units) |
(8,601)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Forfeited (in dollars per unit) |
$ 25.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested ending balance (in units) |
325,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested ending balance (in dollars per unit) |
$ 23.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Fair value of shares granted (thousands of dollars) |
3,149,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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ONEGAS Plan [Member] | Performance Unit Awards [Member] |
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Share-based Payments [Line Items] |
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Released to participants prior to separation, number |
0ogs_Releasedtoparticipantspriortoseparationnumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Released to participants prior to separation, weighted average fair value |
$ 0.00ogs_Releasedtoparticipantspriortoseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Cancelled and replaced upon separation, number |
(739,521)ogs_Cancelledandreplaceduponseparationnumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Cancelled and replaced upon separation, weighted average fair value |
$ 14.57ogs_Cancelledandreplaceduponseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested beginning balance (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested beginning balance (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Granted (in units) |
124,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Weighted -average grant date fair value (per unit) |
$ 35.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Forfeited (in units) |
(15,585)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Forfeited (in dollars per unit) |
$ 19.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested ending balance (in units) |
847,951us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Nonvested ending balance (in dollars per unit) |
$ 17.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Fair value of shares granted (thousands of dollars) |
4,462,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Expected volatility rate |
18.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Expected dividend yield |
3.37%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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Risk-free interest rate |
0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEGASPlanMember |
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ONEOK Plans [Member] |
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Share-based Payments [Line Items] |
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Share-based compensation expense, net of tax |
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9,700,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
4,800,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Share-based compensation, tax benefit |
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6,100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
3,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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ONEOK Plans [Member] | Restricted Stock Units (RSUs) [Member] |
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Share-based Payments [Line Items] |
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Released to participants prior to separation, number |
(66,960)ogs_Releasedtoparticipantspriortoseparationnumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Released to participants prior to separation, weighted average fair value |
$ 28.50ogs_Releasedtoparticipantspriortoseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Cancelled and replaced upon separation, number |
(70,710)ogs_Cancelledandreplaceduponseparationnumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Cancelled and replaced upon separation, weighted average fair value |
$ 40.31ogs_Cancelledandreplaceduponseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested beginning balance (in units) |
137,670us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested beginning balance (in dollars per unit) |
$ 34.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Granted (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Weighted -average grant date fair value (per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 47.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 36.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Released to participants (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Released to participants (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Forfeited (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Forfeited (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested ending balance (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
137,670us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested ending balance (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 34.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Fair value of shares granted (thousands of dollars) |
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1,323,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
2,046,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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ONEOK Plans [Member] | Performance Unit Awards [Member] |
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Share-based Payments [Line Items] |
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Released to participants prior to separation, number |
(128,458)ogs_Releasedtoparticipantspriortoseparationnumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Released to participants prior to separation, weighted average fair value |
$ 34.68ogs_Releasedtoparticipantspriortoseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Cancelled and replaced upon separation, number |
(136,079)ogs_Cancelledandreplaceduponseparationnumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Cancelled and replaced upon separation, weighted average fair value |
$ 45.90ogs_Cancelledandreplaceduponseparationweightedaveragefairvalue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested beginning balance (in units) |
264,537us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Nonvested beginning balance (in dollars per unit) |
$ 40.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Granted (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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Weighted -average grant date fair value (per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 52.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 42.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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|
Forfeited (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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|
|
Forfeited (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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|
|
|
Nonvested ending balance (in units) |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
264,537us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
|
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|
Nonvested ending balance (in dollars per unit) |
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 40.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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|
|
Fair value of shares granted (thousands of dollars) |
|
$ 2,926,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
$ 4,286,000ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
|
|
Expected volatility rate |
|
22.27%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
27.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
|
|
Expected dividend yield |
|
3.04%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
2.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
|
|
Risk-free interest rate |
|
0.42%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
0.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = ogs_ONEOKPlansMember |
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