Income Statement [Abstract]
Statement [Table]
Statement [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Predecessor [Member]
Predecessor [Member]
Statement [Line Items]
Statement [Line Items]
Gross Margin
Gross Profit [Abstract]
Revenues
Regulated Operating Revenue, Gas
Cost of natural gas, including affiliate
Utilities Operating Expense, Gas and Petroleum Purchased
Net margin
Gross Profit
Operating expenses
Operating Expenses [Abstract]
Operations and maintenance, including affiliate
Utilities Operating Expense, Maintenance and Operations
Depreciation and amortization, including affiliate
Utilities Operating Expense, Depreciation and Amortization
General taxes
Utilities Operating Expense, Taxes
Total operating expenses
Utilities Operating Expense
Operating income
Operating Income (Loss)
Other income, including affiliate
Other Nonoperating Income
Other expense, including affiliate
Other Nonoperating Expense
Interest expense, including affiliate
Interest Expense
Income taxes
Income Tax Expense (Benefit)
Net income
Net Income (Loss) Attributable to Parent
Document and Entity Information [Abstract]
4eba46a2-97a9-0056-c25c-d1cfa3a911f6
Document Information [Table]
Document Information [Table]
Document Information, Document [Axis]
Document Information, Document [Axis]
Document [Domain]
Document [Domain]
Document Information [Line Items]
Document Information [Line Items]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Filer Category
Entity Filer Category
Entity Public Float
Entity Public Float
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Income Tax Disclosure [Abstract]
Income tax [Table]
Income tax [Table]
Income tax [Table]
Income tax [Line Items]
Income tax [Line Items]
[Line Items] for Income tax [Table]
INCOME TAXES
Income Tax Disclosure [Text Block]
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
ONEOK, Inc. [Member]
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Schedule of Related Party Transactions
Schedule of Related Party Transactions [Table Text Block]
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information [Table]
Schedule of Quarterly Financial Information [Table]
Schedule of Quarterly Financial Information [Table]
Schedule of Quarterly Financial Information [Line Items]
Schedule of Quarterly Financial Information [Line Items]
[Line Items] for Schedule of Quarterly Financial Information [Table]
Quarterly Financial Data
Schedule of Quarterly Financial Information [Table Text Block]
RELATED-PARTY TRANSACTIONS
Related Party Transactions Disclosure [Text Block]
Accounting Policies [Abstract]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Significant accounting policies of the reporting entity.
Significant Accounting Policies [Line Items]
Significant Accounting Policies [Line Items]
Line items for Significant accounting policies of the reporting entity.
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Fair Value Measurement
Fair Value Measurement, Policy [Policy Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Trade and Other Accounts Receivable
Trade and Other Accounts Receivable, Policy [Policy Text Block]
Inventory
Inventory, Policy [Policy Text Block]
Derivatives and Risk Management
Derivatives, Reporting of Derivative Activity [Policy Text Block]
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Impairment of Goodwill and Long-Lived Assets, including Intangible Assets
Goodwill and Intangible Assets, Policy [Policy Text Block]
Regulation
Regulatory Assets and Liabilities, Recognition Criteria
Pension and Other Postretirement Plans
Pension and Other Postretirement Plans, Policy [Policy Text Block]
Income Taxes
Income Tax, Policy [Policy Text Block]
Asset Retirement Obligations
Asset Retirement Obligations, Policy [Policy Text Block]
Contingencies
Commitments and Contingencies, Policy [Policy Text Block]
Share-based Compensation, Option and Incentive Plans
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Segment Reporting
Segment Reporting, Policy [Policy Text Block]
DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3 [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]
Fair value of natural gas call options held
Fair value of natural gas call options held
The fair value of natural gas call options held, which are recorded in other currents assets.
Losses associated with the change in value of natural gas contracts held deferred in other current assets
Losses associated with the change in value of natural gas contracts held deferred in other current assets
Losses associated with the change in value of natural gas option contracts held that were deferred in other current assets as part of unrecovered purchase-gas costs
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.
Long-term Debt, Fair Value
Long-term Debt, Fair Value
Long-term line of credit with ONEOK
Notes Payable, Related Parties, Noncurrent
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Table]
Commitments and Contingencies [Table]
Disclosure of commitments and contingencies [Table]
Commitments and Contingencies [Line Items]
Commitments and Contingencies [Line Items]
[Line Items] for Disclosure of commitments and contingencies [Table]
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Statement of Cash Flows [Abstract]
Net income
Operating activities
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Provision for doubtful accounts
Provision for Doubtful Accounts
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable
Increase (Decrease) in Receivables
Natural gas in storage
Increase (Decrease) in Inventories
Asset removal costs
Payments for Removal Costs
Affiliate payable
Increase (Decrease) in Due to Affiliates
Accounts payable
Increase (Decrease) in Accounts Payable
Accrued taxes other than income
Increase (Decrease) in Property and Other Taxes Payable
Customer deposits
Increase (Decrease) in Customer Deposits
Regulatory assets and liabilities
Increase (Decrease) in Regulatory Assets and Liabilities
Other assets and liabilities
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Investing activities
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
Proceeds from sale of assets
Proceeds from Sale of Property, Plant, and Equipment
Cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Increase in short-term notes payable to ONEOK, net
Proceeds from (Repayments of) Short-term Debt
Borrowings on long-term line of credit with ONEOK
Proceeds from (Repayments of) Related Party Debt
Repayment of long-term debt
Repayments of Long-term Debt
Distributions to ONEOK
Payments of Capital Distribution
Cash provided by financing activities
Net Cash Provided by (Used in) Financing Activities
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of period
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents at end of period
Supplemental cash flow information:
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of amounts capitalized
Interest Paid
Cash paid to (received from) ONEOK for income taxes
Income Taxes Paid
Fair Value Disclosures
Fair Value Disclosures [Text Block]
Regulatory Assets and Liabilities [Abstract]
Regulatory Assets and Liabilities [Abstract]
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.
Regulatory Assets and Liabilities [Axis]
Regulatory Assets and Liabilities [Axis]
Information by type of regulatory asset/liabilities itemized in a table of regulatory assets/liabilities.
Regulatory Assets and Liabilities [Domain]
Regulatory Assets and Liabilities [Domain]
[Domain] for Information by type of regulatory asset/liabilities itemized in a table of regulatory assets/liabilities.
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.
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.
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
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 Payments [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Restricted Stock Units Activity
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Schedule of Nonvested Performance-based Units Activity
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Employee Benefit Plans [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
ONEOK Pension Plans [Member]
Pension Plans, Defined Benefit [Member]
ONEOK Postretirement Benefit Plans [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
ONE Gas Pension and Postretirement Benefit Plans [Member]
ONE Gas Pension and Postretirement Benefit Plans [Member]
ONE Gas Pension and Postretirement Benefit Plans [Member]
ONEOK 401(k) Plan [Member]
ONEOK 401(k) Plan [Member]
ONEOK 401(k) Plan [Member]
ONEOK Profit-Sharing Plan [Member]
ONEOK Profit-Sharing Plan [Member]
ONEOK Profit-Sharing Plan [Member]
Employee Benefit Plans [Line Items]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost
Profit sharing contribution percentage
Profit sharing contribution percentage
Quarterly contribution percentage made to the profit-sharing plan of each participant's eligible compensation
Maximum percentage of each participants eligible compensation subject to certain limits matching (in hundredths)
Maximum percentage of each participants eligible compensation subject to certain limits matching (in hundredths)
Maximum percentage of each participant's eligible compensation, subject to certain limits, matching by the company.
Percent of employee contributions matched of eligible compensation (in hundredths)
Percent of employee contributions matched of eligible compensation (in hundredths)
Percent of employee contributions matched of eligible compensation. The company will match 100 percent of the employees contribution to the plan, up to a maximum of 6 percent of the employees contribution.
Expense charged to us by ONEOK, Inc.
Expense charged to us by ONEOK, Inc.
Expense charged to us by ONEOK, Inc. for employees directly supporting our operations.
Expected long-term return on plan assets
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Rate of compensation increase - minimum
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Minimum
Expected rate of compensation increases (for pay-related plans), minimum.
Rate of compensation increase - maximum
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Maximum
Expected rate of compensation increases (for pay-related plans), maximum.
Minimum number of years of service for certain employees to be eligible to participate in shared welfare plans that provide postretirement medical and life insurance benefits
Minimum number of years of service for certain employees to be eligible to participate in shared welfare plans that provide postretirement medical and life insurance benefits
The minimum number of years of service for certain employees to be eligible to participate in shared welfare plans that provide postretirement medical and life insurance benefits.
Benefit obligation
Defined Benefit Plan, Benefit Obligation
Fair value of plan assets
Defined Benefit Plan, Fair Value of Plan Assets
Increase in deferred income taxes as a result of the transfer of unrecognized losses from ONEOK
Increase in deferred income taxes as a result of the transfer of unrecognized losses from ONEOK
Increase in deferred income taxes as a result of the transfer of unrecognized losses from ONEOK.
Increase in regulatory assets as a result of the transfer of unrecognized losses from ONEOK
Increase in regulatory assets as a result of the transfer of unrecognized losses from ONEOK
Increase in regulatory assets as a result of the transfer of unrecognized losses from ONEOK.
Weighted-average assumptions used to determine net periodic benefit costs
Schedule of Assumptions Used [Table Text Block]
Reconciliation of Income Tax Provision
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Operating Leased Assets [Table]
Schedule of Operating Leased Assets [Table]
Operating Leased Assets [Line Items]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense
Operating Leases, Rent Expense
Operating Leases, Future Minimum Payments Due [Abstract]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2015
Operating Leases, Future Minimum Payments, Due in Two Years
2016
Operating Leases, Future Minimum Payments, Due in Three Years
2017
Operating Leases, Future Minimum Payments, Due in Four Years
2018
Operating Leases, Future Minimum Payments, Due in Five Years
Thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Total
Operating Leases, Future Minimum Payments Due
SHARE-BASED PAYMENTS [Abstract]
SHARE-BASED PAYMENTS [Abstract]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Performance Unit Awards [Member]
Performance Shares [Member]
Restricted Stock Units [Member]
Restricted Stock Units (RSUs) [Member]
Employee Stock Purchase Plan [Member]
Employee Stock [Member]
Employee Stock Award Program [Member]
Stock Compensation Plan [Member]
Share-based compensation expense, net of tax
Allocated Share-based Compensation Expense, Net of Tax
Share-based compensation, tax benefit
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Share-based compensation, capitalized amount
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount
Award vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Forfeiture rate maximum (in hundredths)
Forfeiture rate maximum (in hundredths)
Maximum percentage estimated forfeiture rate, based on historical forfeitures, applied for all awards outstanding based on historical forfeitures under share-based payment plans.
Total compensation cost not yet recognized
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized
Total compensation cost not yet recognized, period for recognition
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition
Nonvested beginning balance (in units)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Nonvested beginning balance (in dollars per unit)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted (in units)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Weighted -average grant date fair value (per unit)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Granted (in dollars per unit)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Grant Date Fair Value
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
Released to participants (in units)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Released to participants (in dollars per unit)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited (in units)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Forfeited (in dollars per unit)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Nonvested ending balance (in units)
Nonvested ending balance (in dollars per unit)
Fair value of shares granted (thousands of dollars)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Of Shares Granted
The estimated fair value of shares granted during the period.
Expected volatility rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Expected dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Risk-free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Maximum allowable percentage of annual base pay withheld to purchase common stock
Maximum allowable percentage of annual base pay withheld to purchase our common stock
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.
Purchase price percentage of the lower of its grant date or exercise date market price (in hundredths)
Purchase price percentage of the lower of its grant date or exercise date market price (in hundredths)
The purchase price of the stock is 85 percent of the lower of its grant date or exercise date market price.
Employee Stock Purchase Plan Compensation Expense
Employee Stock Ownership Plan (ESOP), Compensation Expense
Employee Stock Award Program, Description
Share-based Compensation Arrangement by Share-based Payment Award, Description
Employee Stock Award Program Compensation Expense
Share-based Compensation
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Short-term note payable to ONEOK [Member]
Loans Payable [Member]
Long-term line of credit with ONEOK [Member]
Line of Credit [Member]
Total share-based compensation cost charged to us by ONEOK
Allocated Share-based Compensation Expense
Pension and postretirement health and life insurance plans costs charged to us by ONEOK, net
Pension and Other Postretirement Benefit Expense
Amount of pension and postretirement health and life insurance costs deferred through regulatory mechanisms
Amount of pension and postretirement health and life insurance costs deferred through regulatory mechanisms
The amount of pension and postretirement health and life insurance costs charged to us by ONEOK that were deferred through regulatory mechanisms.
Expense [Abstract]
Related Party Transaction, Expenses [Abstract]
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Cost of natural gas
Related Parties Amount in Cost of Sales
Operations and maintenance [Abstract]
Operations and maintenance [Abstract]
Operations and maintenance
Direct employee labor and benefits costs
Direct employee labor and benefits costs
Direct employee labor and benefits costs charged to us by ONEOK.
Allocated employee labor and benefit costs
Allocated employee labor and benefit costs
Allocated employee labor and benefit costs charged to us by ONEOK.
Charges for general and administrative services
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party
Depreciation and amortization
Other Depreciation and Amortization
Other (income)/expense, net
Other Nonoperating Income (Expense)
Interest expense
Interest Expense, Related Party
Total expenses
Costs and Expenses, Related Party
Employee labor and benefit costs capitalized
Employee labor and benefit costs capitalized
The amount of employee labor and benefit costs charged to us by ONEOK that was capitalized.
Weighted-average interest rate
Related Party Transaction, Rate
Note Payable, Interest Rate Description
Debt Instrument, Description of Variable Rate Basis
Line of Credit Facility, Interest Rate Description
Line of Credit Facility, Interest Rate Description
Disclosure of Compensation Related Costs, Share-based Payments
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Property, Plant and Equipment [Abstract]
Entities [Table]
Entities [Table]
Regulation Status [Axis]
Regulation Status [Axis]
Regulated and Unregulated Operation [Domain]
Regulated and Unregulated Operation [Domain]
Regulated [Member]
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Entity Information [Line Items]
Property, Plant and Equipment by Property Type
Property, Plant and Equipment [Table Text Block]
Average Depreciation Rates for Regulated Property
Average Depreciation Rates for Regulated Property [Table Text Block]
Tabular disclosure of the average depreciation rates of regulated property as of period end.
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Under-recovered purchased-gas costs [Member]
Under-recovered purchased-gas costs [Member]
Represents the amount of under-recovered purchased-gas costs [Member]
Reacquired debt costs [Member]
Loss on Reacquired Debt [Member]
Pension and postretirement benefit costs [Member]
Pension Costs [Member]
Weather normalization [Member]
Weather normalization [Member]
Weather normalization represents revenue over- or under-recovered through the weather normalization adjustment rider in Kansas. This amount is deferred as a regulatory asset for a 12-month period. Kansas Gas Service then applies an adjustment to the customers’ bills for 12 months to refund the over-collected revenue or bill the under-collected revenue.
Recoupable take-or-pay [Member]
Recoupable take-or-pay [Member]
Recovery of the recoupable take-or-pay settlements.
Transition cost [Member]
Natural Gas Transition Cost [Member]
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.
Other regulatory assets [Member]
Other regulatory assets [Member]
Represents other regulatory assets.
Total regulatory assets, net of amortization [Member]
Total regulatory assets, net of amortization [Member]
Total regulatory assets, net of amortization
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Accumulated removal costs [Member]
Asset Retirement Obligation Costs [Member]
Over-recovered purchased-gas costs [Member]
Over-recovered purchased-gas costs [Member]
Represents the amount of over-recovered purchased-gas costs.
Total regulated liabilities [Member]
Total regulated liabilities [Member]
Represents the amount of total regulated liabilities.
Amortization of Regulatory Asset
Amortization of Regulatory Asset
Regulatory Asset, Amortization Period
Estimated Recovery Period
The estimated amortization period for recovery of the individual regulatory asset/liability in a schedule of regulatory assets/liabilities.
Regulatory Assets, Current
Regulatory Assets, Current
Regulatory Assets, Noncurrent
Regulatory Assets, Noncurrent
Regulatory Assets
Regulatory Assets
Regulatory Liability, Current
Regulatory Liability, Current
Regulatory Liability, Noncurrent
Regulatory Liability, Noncurrent
Regulatory Liabilities
Regulatory Liabilities
Net regulatory assets and 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.
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.
Net Regulatory Assets
Net Regulatory Assets
Subsequent Events [Abstract]
Subsequent Event [Table]
Subsequent Event [Table]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
SUBSEQUENT EVENTS
Subsequent Events [Text Block]
Operating loss carryforwards, expiration starting date
Operating Loss Carryforwards, Expiration Dates
Income taxes receivable
Income Taxes Receivable
Income taxes payable
Accrued Income Taxes
Provision for income taxes [Abstract]
Income Tax Expense (Benefit) [Abstract]
Current income tax provision (benefit)
Current Income Tax Expense (Benefit) [Abstract]
Federal
Current Federal Tax Expense (Benefit)
State
Current State and Local Tax Expense (Benefit)
Total current income tax provision (benefit)
Current Income Tax Expense (Benefit)
Deferred income tax provision
Deferred Income Tax Expense (Benefit) [Abstract]
Federal
Deferred Federal Income Tax Expense (Benefit)
State
Deferred State and Local Income Tax Expense (Benefit)
Total deferred income tax provision
Income tax provision
Income Tax Reconciliation [Abstract]
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate
Provision for federal income taxes
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate
State income taxes, net of federal benefit
Income Tax Reconciliation, State and Local Income Taxes
Other, net
Income Tax Reconciliation, Other Adjustments
Deferred Tax Liabilities, Net [Abstract]
Deferred Tax Liabilities, Net [Abstract]
Deferred tax assets
Components of Deferred Tax Assets [Abstract]
Net operating loss
Deferred Tax Assets, Operating Loss Carryforwards
Other
Deferred Tax Assets, Other
Total deferred tax assets
Deferred Tax Assets, Gross
Deferred tax liabilities
Components of Deferred Tax Liabilities [Abstract]
Excess of tax over book depreciation
Deferred Tax Liabilities, Property, Plant and Equipment
Purchased-gas cost adjustment
Deferred Tax Liabilities, Regulatory Assets and Liabilities
Other regulatory assets and liabilities, net
Deferred Tax Liabilities, Other
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Net deferred tax liabilities
Deferred Tax Liabilities, Net
PROPERTY, PLANT AND EQUIPMENT
Property, Plant and Equipment Disclosure [Text Block]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Notes Payable Due 2019 [Member]
Note Payable Due 2019 [Member]
Note Payable Due 2019 [Member]
Notes Payable Due 2024 [Member]
Note Payable Due 2024 [Member]
Note Payable Due 2024 [Member]
Notes Payable due 2044 [Member]
Notes Payable Due 2044 [Member]
A written promise to pay a note.
ONE Gas Credit Agreement [Member]
Debt Instrument, Covenant Description
Debt Instrument, Covenant Description
Proceeds from Issuance of Private Placement
Proceeds from Issuance of Private Placement
Cash Payment to ONEOK Upon Separation
Cash Payment to ONEOK Upon Separation
Cash Payment to ONEOK Upon Separation
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Preferred Stock, Shares Authorized
Preferred Stock, Shares Authorized
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.
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 may increase to.
Long-term Debt, Gross
Long-term Debt, Gross
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Call Feature
Debt Instrument, Call Feature
Line of Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Commitment Fee Percentage
Line of Credit Facility, Commitment Fee Description
Future Minimum Rental Payments for Operating Lease and Firm Transportation and Storage Contracts
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Statement of Financial Position [Abstract]
Assets
Assets [Abstract]
Property, plant and equipment
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment
Public Utilities, Property, Plant and Equipment, Plant in Service
Accumulated depreciation and amortization
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
Net property, plant and equipment (Note 6)
Public Utilities, Property, Plant and Equipment, Net
Current assets
Assets, Current [Abstract]
Cash
Accounts receivable, net
Receivables, Net, Current
Natural gas in storage
Public Utilities, Inventory
Regulatory assets (Note 5)
Other current assets
Other Assets, Current
Total current assets
Assets, Current
Goodwill and other assets
Investments and other assets [Abstract]
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Regulatory assets (Note 5)
Goodwill
Goodwill
Other assets
Other Assets, Noncurrent
Total goodwill and other assets
Total goodwill and other assets
Sum of the carrying amounts as of the balance sheet date of all assets, excluding property, plant and equipment, that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.
Total assets
Assets
Common Stock, Value, Issued
Common Stock, Value, Issued
Equity and Liabilities
Liabilities and Equity [Abstract]
Equity and long-term debt
Capitalization, Long-term Debt and Equity [Abstract]
Owner's net investment
Stockholders' Equity Attributable to Parent
Long-term debt, excluding current maturities
Long-term Debt, Excluding Current Maturities
Total equity
Capitalization, Long-term Debt and Equity
Current liabilities
Liabilities, Current [Abstract]
Current maturities of long-term debt
Long-term Debt, Current Maturities
Short-term note payable to ONEOK
Notes Payable, Related Parties, Current
Affiliate payables
Due to Affiliate, Current
Accounts payable
Accounts Payable, Current
Accrued taxes other than income
Accrual for Taxes Other than Income Taxes, Current
Customer deposits
Customer Deposits, Current
Other current liabilities
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Deferred credits and other liabilities [Abstract]
Liabilities, Noncurrent [Abstract]
Deferred income taxes
Deferred Tax Liabilities, Net, Noncurrent
Other deferred credits
Other Liabilities, Noncurrent
Total deferred credits and other liabilities
Total deferred credits and other liabilities
Total obligations, excluding long-term debt, incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle.
Commitments and contingencies (Note 10)
Commitments and Contingencies
Total liabilities and equity
Liabilities and Equity
Statement of Stockholders' Equity [Abstract]
Unbilled Receivables, Current
Unbilled Receivables, Current
Number of natural gas distribution services customers
Number of natural gas distribution services customers
Number of customers the natural gas distribution service segment services.
Allowance for Doubtful Accounts Receivable, Current
Allowance for Doubtful Accounts Receivable, Current
Materials, Supplies, and Other
Materials, Supplies, and Other
Goodwill, Impairment Loss
Goodwill, Impairment Loss
Asset Impairment Charges
Asset Impairment Charges
Deferred Tax Assets, Valuation Allowance
Deferred Tax Assets, Valuation Allowance
Liability for Uncertain Tax Positions, Current
Liability for Uncertain Tax Positions, Current
Segment Reporting, Disclosure of Major Customers
Segment Reporting, Disclosure of Major Customers
QUARTERLY FINANCIAL DATA (UNAUDITED)
Quarterly Financial Information [Text Block]
EMPLOYEE BENEFIT PLANS
Pension and Other Postretirement Benefits Disclosure [Text Block]
Schedule of Regulatory Assets and Liabilities
Schedule of Regulatory Assets and Liabilities [Text Block]
Common Stock, Par or Stated Value Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Shares, Issued
Common Stock, Shares, Issued
Common Stock, Shares, Outstanding
Common Stock, Shares, Outstanding
DESCRIPTION OF BUSINESS
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Schedule of Property, Plant and Equipment [Table]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Natural gas distribution pipelines and related equipment
Gas Distribution Equipment [Member]
Natural gas transmission pipelines and related equipment
Gas Transmission Equipment [Member]
General plant and other
Land, Buildings and Improvements [Member]
Construction work in process
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization
Net property, plant and equipment
Average depreciation rates, minimum
Average depreciation rates, minimum
The minimum average depreciation percentage rate of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.
Average depreciation rates, maximum
Average depreciation rates, maximum
The maximum average depreciation percentage rate of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.
Interest costs capitalized
Interest Costs Capitalized
Construction work in process expenditures incurred but not yet paid
Construction in Progress Expenditures Incurred but Not yet Paid
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.
Number of sites where soil remediation has begun
Number of sites where soil remediation has begun
Number of sites where soil remediation has begun.
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
Number Of Sites Soil Remediation Is Completed Or Near Completion
Number Of Sites Soil Remediation Is Completed Or Near Completion
Number of sites soil remediation is completed or near completion.
Percentage yield of high consequence pipeline areas
PercentageYieldOfHighConsequencePipelineAreas
Minimum percentage yield required to test pipelines previously untested in high-consequence areas.
Net margin
Operating income