Related Party Transactions [Abstract] Related Party Transactions [Abstract] Reclassifications [Text Block] Reclassifications [Text Block] Long-term Line of Credit Long-term Line of Credit Environmental Compliance [Axis] Environmental Compliance [Axis] Environmental Compliance [Axis] Lessee, Leases [Policy Text Block] Lessee, Leases [Policy Text Block] Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Total current liabilities Liabilities, Current Defined Benefit Plan, Net Periodic Benefit Cost, Net of Unconsolidated Affiliates Defined Benefit Plan, Net Periodic Benefit Cost, Net of Unconsolidated Affiliates Defined Benefit Plan, Net Periodic Benefit Cost, Net of Unconsolidated Affiliates Schedule of Related Party Transactions [Table Text Block] Schedule of Related Party Transactions [Table Text Block] Operating Lease Obligations [Domain] Operating Lease Obligations [Domain] Operating Lease Obligations [Domain] Interest cost Defined Benefit Plan, Interest Cost Other current assets Increase (Decrease) in Other Current Assets Other assets Increase (Decrease) in Other Noncurrent Assets COST OF SALES Cost of Goods and Services Sold Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Current Fiscal Year End Date Current Fiscal Year End Date OG&E Industrial Authority Bonds [Member] Og And E Industrial Authority Bonds [Member] Og And E Industrial Authority Bonds [Member] Other Contracts with Customers [Member] Other Contracts with Customers [Member] Other Contracts with Customers [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Operating revenues Revenues Entity Address, Postal Zip Code Entity Address, Postal Zip Code Defined Benefit Plan [Abstract] Defined Benefit Plan [Abstract] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Provision for Rate Refund [Member] Provision for Rate Refund [Member] Provision for Rate Refund [Member] Cash Paid on Operating Leases Cash Paid on Operating Leases Cash Paid on Operating Leases Net property, plant and equipment Property, Plant and Equipment, Net Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Two Years AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] TOTAL ASSETS Assets Regulatory Liability [Axis] Regulatory Liability [Axis] Entity Shell Company Entity Shell Company Operating Costs Charged [Member] Operating Costs Charged [Member] Operating Costs Charged [Member] Operating Lease, Liability Operating Lease, Liability Current Regulatory Liabilities Regulatory Liability, Current Cover page. Cover [Abstract] Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Document Type Document Type Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Common stockholder's equity Common Stocks, Including Additional Paid in Capital Payment of long-term debt Repayments of Long-term Debt Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Scenario [Domain] Scenario [Domain] OG&E Railcar Lease Agreement [Member] OG&E Railcar Lease Agreement [Member] OG&E Railcar Lease Agreement [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Industrial [Member] Industrial [Member] Industrial [Member] Restricted Stock [Member] Restricted Stock [Member] Accounts receivable and accrued unbilled revenues, net Increase (Decrease) in Accounts Receivable Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Four Liabilities, Current [Abstract] Liabilities, Current [Abstract] Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Unrecorded Unconditional Purchase Obligation, Imputed Interest Unrecorded Unconditional Purchase Obligation, Imputed Interest Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Document Quarterly Report Document Quarterly Report Income Tax Authority [Domain] Income Tax Authority [Domain] COMMITMENTS AND CONTINGENCIES (NOTE 11) Commitments and Contingencies Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Short-term Debt [Line Items] Short-term Debt [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Class of Stock [Domain] Class of Stock [Domain] Deferred storm expenses Deferred storm expenses [Member] Deferred storm expenses [Member] Non-Retail Revenues [Domain] Non-Retail Revenues [Domain] [Domain] for Non-Retail Revenues [Axis] Other operation and maintenance Other Cost and Expense, Operating Entity File Number Entity File Number Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Defined Benefit Plan, Plan Assets, Contributions by Employer Defined Benefit Plan, Plan Assets, Contributions by Employer Production Tax Credit Rider [Member] Production Tax Credit Rider [Member] Production Tax Credit Rider [Member] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Basis of Accounting [Text Block] Segments [Axis] Segments [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Product and Service [Domain] Product and Service [Domain] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] OG&E Senior Notes [Member] Og and E Senior Notes [Member] Og and E Senior Notes [Member] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Reserve for Tax Refund [Member] Reserve for Tax Refund [Member] Reserve for Tax Refund [Member] Dry Scrubber Regulatory Asset [Member] Dry Scrubber Regulatory Asset [Member] Dry Scrubber Regulatory Asset [Member] OPERATING INCOME Operating Income (Loss) Measurement Frequency [Domain] Measurement Frequency [Domain] Segments [Domain] Segments [Domain] Statement [Line Items] Statement [Line Items] Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Customer deposits Customer Deposits, Current Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Income tax benefit Share-based Payment Arrangement, Expense, Tax Benefit COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Plan Name [Axis] Plan Name [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Advances from parent Advances From Parent Advances payable, within one year or the normal operating cycle, to a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. Amendment Flag Amendment Flag Debt Instrument, Maturity Date Debt Instrument, Maturity Date Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Change in certain current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Customer [Axis] Customer [Axis] Interest expense Interest Expense Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due Enable Midstream Partners [Member] Enable Midstream Partners [Member] Enable Midstream Partners [Member] Class of Stock [Axis] Class of Stock [Axis] Pension tracker Pension tracker [Member] Pension tracker [Member] Capitalized Portion of Net Periodic Benefit Cost Capitalized Portion of Net Periodic Benefit Cost Capitalized Portion of Net Periodic Benefit Cost Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares Adjustments to Additional 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Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Accounts receivable, less reserve of $1.1 and $1.5, respectively Accounts Receivable, after Allowance for Credit Loss, Current Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Commercial [Member] Commercial [Member] Commercial [Member] Net other income Nonoperating Income (Expense) Long-Term Debt [Text Block] Long-term Debt [Text Block] Leases [Text Block] Leases [Text Block] Leases [Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Letters of Credit Outstanding Letters of Credit Outstanding, Amount Total current assets Assets, Current Entity Current Reporting Status Entity Current Reporting Status Operating Lease Obligations [Axis] Operating Lease Obligations [Axis] Operating Lease Obligations [Axis] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Outstanding Intercompany Borrowings Outstanding Intercompany Borrowings Outstanding Intercompany Borrowings NET INCOME Net income Net Income (Loss) Attributable to Parent Common Stock Common Stock [Member] CURRENT ASSETS Assets, Current [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Leases [Abstract] Leases [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Product and Service [Axis] Product and Service [Axis] Operating Lease, Cost Operating Lease, Cost Entity Small Business Entity Small Business Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Statement, Scenario [Axis] Scenario [Axis] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Entity Filer Category Entity Filer Category Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Compensation expense Share-based Payment Arrangement, Expense Related Party Transaction [Domain] Related Party Transaction [Domain] Estimated Refund to SPP Estimated Refund to SPP Estimated Refund to SPP Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY Liabilities and Equity Transmission [Member] Transmission [Member] Transmission [Member] Entity Address, City 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Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Share-based Payment Arrangement [Member] Share-based Payment Arrangement [Member] Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Estimated Refund to SPP [Axis] Estimated Refund to SPP [Axis] Estimated Refund to SPP [Axis] Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Pension and Other Postretirement Benefits Disclosure [Text Block] Pension and Other Postretirement Benefits Disclosure [Text Block] DEFERRED CHARGES AND OTHER ASSETS Other Assets, Noncurrent [Abstract] Regulatory Liability [Domain] Regulatory Liability [Domain] Changes in advances with parent Changes In Advances With Parent The net change during the reporting period in advances, within one year or the normal operating cycle, from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances from clients. Fair Value, Recurring [Member] Fair Value, Recurring [Member] INTEREST EXPENSE Interest Expense [Abstract] Other expense Other Nonoperating Expense Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Recommended Common Equity Percentage Recommended Common Equity Percentage Recommended Common Equity Percentage Dividends, Common Stock, Cash Dividends, Common Stock, Cash Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Other Other Assets, Miscellaneous, Noncurrent System sales revenues Total Retail Customer [Member] Total Retail Customer [Member] Geographical [Axis] Geographical [Axis] Retained Earnings Retained Earnings [Member] OKLAHOMA OKLAHOMA Garfield Industrial Authority Bond [Member] Garfield Industrial Authority Bond [Member] Garfield Industrial Authority Bond [Member] Liabilities, Other than Long-term Debt, Noncurrent, Total Liabilities, Other than Long-term Debt, Noncurrent Document Period End Date Document Period End Date Other Other Assets, Current Statement [Table] Asset Retirement Obligations [Table] Statement [Table] Entity Registrant Name Entity Registrant Name Estimated Refund to SPP [Domain] Estimated Refund to SPP [Domain] [Domain] for Estimated Refund to SPP [Axis] Type of Acceleration of Debt [Domain] Type of Acceleration of Debt [Domain] [Domain] for Type of Acceleration of Debt [Axis] Other income Other Nonoperating Income CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Maximum [Member] Maximum [Member] Service cost Defined Benefit Plan, Service Cost Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt Transitional Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Transitional Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Transitional Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Three Related Party [Domain] Related Party [Domain] Accrued unbilled revenues Unbilled Receivables, Current OG&E Tinker Debt [Member] OG and E Tinker Debt [Member] OG and E Tinker Debt [Member] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Retained earnings Retained Earnings (Accumulated Deficit) Oklahoma Demand Program Over Recovery [Member] Oklahoma Demand Program Over Recovery [Member] Oklahoma Demand Program Over Recovery [Member] Entity Tax Identification Number Entity Tax Identification Number Regulatory liabilities Increase (Decrease) in Regulatory Liabilities Revenue [Policy Text Block] Revenue [Policy Text Block] Debt Instrument, Face Amount Debt Instrument, Face Amount Trading Symbol Trading Symbol Minimum [Member] Minimum [Member] Smart Grid [Member] Smart Grid [Member] Smart Grid [Member] Entity Information [Line Items] Entity Information [Line Items] Settlement cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Allowance for borrowed funds used during construction Public Utilities, Allowance for Funds Used During Construction, Additions Total Shareholder Return [Member] Total Shareholder Return [Member] Total Shareholder Return [Member] Regulatory Asset [Domain] Regulatory Asset [Domain] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Legal Entity [Axis] Legal Entity [Axis] Impact to Company [Member] Impact to Company [Member] Impact to Company [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Four Years Capital expenditures (less allowance for equity funds used during construction) Payments to Acquire Productive Assets Rate Matters and Regulation [Text Block] Rate Matters And Regulation [Text Block] Describes all of the specific events that have or may impact rates and amortization of regulatory assets and liabilities (for example, pending or recently concluded regulatory proceedings). Specifics may include quantifications related to rates, costs, and earnings. Events may relate to rate moratoriums or price tags. Net cash provided from financing activities Net Cash Provided by (Used in) Financing Activities Other current liabilities Increase (Decrease) in Other Current Liabilities Amount Attributable to Unconsolidated Affiliates Amount Attributable to Unconsolidated Affiliates Amount Attributable to Unconsolidated Affiliates Entity [Domain] Entity [Domain] INCOME TAX EXPENSE Income Tax Expense (Benefit) Share-based Payment Arrangement [Text Block] Share-based Payment Arrangement [Text Block] Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Accrued removal obligations, net Accrued removal obligations [Member] Accrued removal obligations [Member] Vesting [Axis] Vesting [Axis] Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Two Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other Other Liabilities, Noncurrent City Area Code City Area Code Title of 12(b) Security Title of 12(b) Security Related Party [Axis] Related Party [Axis] Entity by Location [Axis] Entity by Location [Axis] Deferred investment tax credits Accumulated Deferred Investment Tax Credit ARKANSAS ARKANSAS Related Party Transactions [Policy Text Block] Related Party Transactions [Policy Text Block] Related Party Transactions [Policy Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Award Date [Axis] Award Date [Axis] INCOME BEFORE TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Long-term debt, gross Long-term Debt, Gross ASSETS Assets [Abstract] OG&E Wind Farm Land Lease Agreements [Member] OG&E Wind Farm Land Lease Agreements [Member] OG&E Wind Farm Land Lease Agreements Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Share-based Payment Arrangement, Cost by Plan [Table Text Block] Share-based Payment Arrangement, Cost by Plan [Table Text Block] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Operating expenses Operating Expenses Performance Shares [Member] Performance Shares [Member] OTHER INCOME (EXPENSE) Nonoperating Income (Expense) [Abstract] Short-term Debt [Abstract] Short-term Debt [Abstract] Dividends, Common Stock, Cash, Number of Shares Dividends, Common Stock, Cash, Number of Shares Dividends, Common Stock, Cash, Number of Shares Other Regulatory Asset [Member] Other Regulatory Assets [Member] Other Regulatory Assets [Member] Interest on long-term debt Interest Expense, Long-term Debt Customer Impact [Member] Customer Impact [Member] Customer Impact [Member] Schedule of Regulatory Assets and Liabilities [Line Items] Schedule of Regulatory Assets and Liabilities [Line Items] Schedule of Regulatory Assets and Liabilities [Line Items] Operating Leases, Rent Expense, Net Operating Leases, Rent Expense, Net Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Natural Gas Transportation [Member] Natural Gas Transportation [Member] Natural Gas Transportation [Member] Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Customer [Domain] Customer [Domain] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Changes in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Statistical Measurement [Axis] Statistical Measurement [Axis] Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Short-Term Debt and Credit Facility [Text Block] Short-term Debt [Text Block] Basis of Accounting [Text Block] Basis of Accounting, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Type of Acceleration of Debt [Axis] Type of Acceleration of Debt [Axis] Type of Acceleration of Debt [Axis] Redeemable during the next 12 months [Member] Debentures Subject to Mandatory Redemption [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Revenues from Contracts with Customers [Abstract] Revenues from Contracts with Customers [Abstract] Revenues from Contracts with Customers [Abstract] Schedule of Regulatory Assets and Liabilities [Text Block] Schedule of Regulatory Assets and Liabilities [Text Block] Entities [Table] Entities [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Muskogee Industrial Authority Bond Due 2027 [Member] Muskogee Industrial Authority Bond Due 2027 [Member] Muskogee Industrial Authority Bond Due 2027 [Member] Accounting Pronouncements [Abstract] Accounting Pronouncements [Abstract] Accounting Pronouncements [Abstract] Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Share Based Compensation, Shares Issued, Returned and Cash Recieved from Exercise [Axis] Share Based Compensation, Shares Issued, Returned and Cash Recieved from Exercise [Axis] Share Based Compensation, Shares Issued, Returned and Cash Recieved from Exercise [Axis] SPP Cost Tracker Rider Over Recovery [Member] SPP Cost Tracker Rider Over Recovery [Member] SPP Cost Tracker Rider Over Recovery [Member] Unamortized loss on reacquired debt Loss on Reacquired Debt [Member] Accrued compensation Employee-related Liabilities, Current Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Investment in Grid Enhancement Investment in Grid Enhancement Investment in Grid Enhancement Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Other net periodic benefit income (expense) Pension and Other Postretirement Benefits Cost (Reversal of Cost) New Accounting Pronouncements and Changes in Accounting Principles [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments Due, Next Twelve Months Intercomany Borrowings, Maximum Borrowing Capacity Intercomany Borrowings, Maximum Borrowing Capacity Intercomany Borrowings, Maximum Borrowing Capacity Allowance for Credit Losses Allowance for Credit Losses [Text Block] Liabilities and Equity [Abstract] Liabilities and Equity [Abstract] Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Total deferred charges and other assets Other Assets, Noncurrent Public Utilities, Amount Requested for Acquisition Public Utilities, Amount Requested for Acquisition Public Utilities, Amount Requested for Acquisition CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares Long-term Debt Total (redeemable during next 12 months) Long-term Debt Muskogee Industrial Authority Bond Due 2025 [Member] Muskogee Industrial Authority Bond Due 2025 [Member] Muskogee Industrial Authority Bond Due 2025 [Member] Cogeneration Credit Rider Over Credit [Member] Cogeneration Credit Rider Over Credit [Member] Cogeneration Credit Rider Over Credit [Member] Award Date [Domain] Award Date [Domain] Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Accrued interest Interest Payable, Current Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Year Five In service Public Utilities, Property, Plant and Equipment, Plant in Service Retirement Plan Type [Domain] Retirement Plan Type [Domain] Oklahoma demand program rider under recovery (A) Oklahoma demand program rider under recovery [Member] Oklahoma demand program rider under recovery[Member] Residential [Member] Residential [Member] Residential [Member] Regulatory Liability, Noncurrent Non-Current Regulatory Liabilities Regulatory Liability, Noncurrent Other Other Liabilities, Current Materials and supplies, at average cost Other Inventory, Supplies, Gross OGE Energy [Member] OGE Energy [Member] OGE Energy [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Income taxes payable - parent Increase (Decrease) in Income Taxes Payable Premium on Common Stock Additional Paid-in Capital [Member] Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Public Utilities, Policy [Policy Text Block] Public Utilities, Policy [Policy Text Block] Fuel inventories Public Utilities, Inventory Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Total property, plant and equipment Property, Plant and Equipment, Gross Geographical [Domain] Geographical [Domain] Other revenues Revenues from Alternative Revenue Programs Revenues from Alternative Revenue Programs Oilfield [Member] Oilfield [Member] Oilfield [Member] Entity Address, State or Province Entity Address, State or Province Performance Units Related to Earnings Per Share [Member] Performance Units Related to Earnings Per Share [Member] Performance Units Related to Earnings Per Share [Member] Schedule of Regulatory Assets and Liabilities [Table Text Block] Schedule of Regulatory Assets and Liabilities [Table Text Block] A table of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs and recognition of certain revenues that are included in rate-setting to the balance sheet. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Related Party Transaction [Line Items] Related Party Transaction [Line Items] Exchange [Domain] Exchange [Domain] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Net of Unconsolidated Affiliates Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Net of Unconsolidated Affiliates Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Net of Unconsolidated Affiliates Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Accrued benefit obligations Liability, Defined Benefit Plan, Noncurrent Accounts payable Accounts Payable, Current Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Taxes other than income Taxes, Miscellaneous Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Lease Maturity Analysis [Abstract] Lease Maturity Analysis [Abstract] Lease Maturity Analysis [Abstract] Entity Interactive Data Current Entity Interactive Data Current Fuel recoveries Increase (Decrease) in Deferred Fuel Costs Public Utilities, Property, Plant and Equipment, Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Regulatory assets Increase (Decrease) in Other Regulatory Assets Amortization of unrecognized prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Environmental Compliance [Domain] Environmental Compliance [Domain] [Domain] for Environmental Compliance [Axis] Pension Plan [Member] Pension Plan [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Benefit obligations regulatory asset Benefit Obligations [Member] Benefit Obligations [Member] Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Award Type [Domain] Award Type [Domain] Electricity to power electric compression assets Revenue from Related Parties Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Five Years Commitments and Contingencies [Text Block] Commitments and Contingencies Disclosure [Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Long-term Purchase Commitment [Line Items] Long-term Purchase Commitment [Line Items] Additional Pension Expense to Meet State Requirements Additional Pension Expense to Meet State Requirements Additional Pension Expense to Meet State Requirements Related Party Transaction, Purchases from related party Related Party Transaction, Purchases from Related Party Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Interest on short-term debt and other interest charges Interest Expense, Short-term Borrowings Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-term Debt, Fair Value Long-term Debt, Fair Value Liabilities, Total Liabilities Allowance for equity funds used during construction Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment, Net [Abstract] Deferred income taxes and investment tax credits, net Deferred Income Taxes and Tax Credits Vesting [Domain] Vesting [Domain] Amortization of net loss Defined Benefit Plan, Amortization of Gain (Loss) Fuel, materials and supplies inventories Increase (Decrease) in Inventories Location [Domain] Location [Domain] Percent of Principal Amount Subject to Optional Tender Percent of Principal Amount Subject to Optional Tender Percent of Principal Amount Subject to Optional Tender Liabilities, Other than Long-term Debt, Noncurrent [Abstract] Liabilities, Other than Long-term Debt, Noncurrent [Abstract] Advances to parent Advances to parent Advances receivable, within one year or the normal operating cycle, from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances from clients. CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS AT END OF PERIOD Cash and Cash Equivalents, at Carrying Value Transmission Cost Recovery Rider [Member] Transmission Cost Recovery Rider [Member] transmission cost recovery rider [Member] Asset Retirement Obligation [Abstract] Asset Retirement Obligation [Abstract] Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Construction work in progress Construction in Progress, Gross Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block] Statement, Equity Components [Axis] Equity Components [Axis] Stockholders' Equity Attributable to Parent, Total Balance Balance Stockholders' Equity Attributable to Parent Fuel clause over recoveries Customer Refund Liability, Current Regulated Operations [Abstract] Regulated Operations [Abstract] Alternative Revenue [Abstract] Alternative Revenue [Abstract] Alternative Revenue [Abstract] Long-term Debt, Unclassified [Abstract] Long-term Debt, Unclassified [Abstract] Fair Value Measurement [Text Block] Fair Value Disclosures [Text Block] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Lessee, Operating Lease, Disclosure [Table Text Block] Lease, Cost [Table Text Block] Fuel clause under recoveries Deferred Fuel Cost Commercial Paper Commercial Paper Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Other Regulatory Liability[Member] Other Regulatory Liabilities [Member] Other Regulatory Liabilities [Member] Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Security Exchange Name Security Exchange Name Regulatory assets Non-Current Regulatory Assets Regulatory Assets, Noncurrent Related Party Transaction [Axis] Related Party Transaction [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Net cash provided from operating activities Net Cash Provided by (Used in) Operating Activities Total Equity Component [Domain] Integrated Market [Member] Integrated Market [Member] Integrated Market [Member] Document Transition Report Document Transition Report Accrued taxes Taxes Payable, Current Schedule of Regulatory Assets and Liabilities [Table] Schedule of Regulatory Assets and Liabilities [Table] Schedule of Regulatory Assets and Liabilities [Table] Current Regulatory Assets Regulatory Assets, Current Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Three Years Income taxes refundable to customers, net Income taxes recoverable from customers, net Income taxes recoverable from customers, net [Member] Income taxes recoverable from customers, net [Member] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Other Pension Plan [Member] Other Pension Plan [Member] Lessee, Operating Lease, Contingent Liability Lessee, Operating Lease, Contingent Liability Lessee, Operating Lease, Contingent Liability Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent OTHER PROPERTY AND INVESTMENTS Other Long-term Investments Income Statement [Abstract] Income Statement [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis]