Restatement [Axis] Revision of Prior Period [Axis] Target Plan Asset Allocations Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Change in Requested Rate Increase Change in Requested Rate Increase Change in Requested Rate Increase Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party [Axis] Related Party [Axis] Environmental Compliance [Axis] Environmental Compliance [Axis] Environmental Compliance [Axis] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Retirement Plans and Postretirement Benefit Plans [Abstract] Retirement Plans and Postretirement Benefit Plans [Abstract] Effective Income Tax Rate 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Future Benefit Payments, Year Five Defined Benefit Plan, Expected Future Benefit Payment, Year Five Amortization of net unfunded deferred taxes Effective Income Tax Rate Reconciliation Amortization of Net Unfunded Deferred Taxes Effective Income Tax Rate Reconciliation Amortization of Net Unfunded Deferred Taxes ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Net Effect of Settlement on Other Comprehensive Income and Regulatory Assets Net Effect of Settlement on Other Comprehensive Income and Regulatory Assets Net Effect of Settlement on Other Comprehensive Income and Regulatory Assets Accounting Policies [Abstract] Accounting Policies [Abstract] Operating Costs Charged [Member] Operating Costs Charged [Member] Operating Costs Charged [Member] Long-term Debt, Maturities, Repayments of Principal in Year Three Long-Term Debt, Maturity, Year Three Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] Crossroads wind farm rider under recovery [Member] Crossroads wind farm rider under recovery [Member] Crossroads wind farm rider under recovery [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Collection of Sales Tax, Policy [Policy Text Block] Collection of sales tax policy [Policy Text Block] Collection of sales tax policy [Policy Text Block] Plant Investments For Customers Plant Investments For Customers Plant Investments For Customers Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, to be Paid, Year One Industrial [Member] Industrial [Member] Industrial [Member] Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Total Compensation Cost Not yet Recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Tax Credit Carryforward, Amount Tax Credit Carryforward, Amount Enable Gas Transportation and Storage Agreement [Member] Enable Gas Transportation and Storage Agreement [Member] Enable Gas Transportation and Storage Agreement [Member] Adjustments for New Accounting Pronouncement [Member] Adjustments for New Accounting Pronouncement [Member] Regulatory liabilities Regulatory Liability, Noncurrent Regulatory Liability, Noncurrent Operating expenses Operating 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Net Accrued unbilled revenues Unbilled Receivables, Current Non-Retail Revenues [Domain] Non-Retail Revenues [Domain] [Domain] for Non-Retail Revenues [Axis] Fair Value, Measurement Frequency [Domain] Measurement Frequency [Domain] Derivative [Member] Derivative [Member] Exercised Stock Options [Table Text Block] Exercised Stock Options [Table Text Block] Exercised Stock Options [Table Text Block] Plan Assets Attributable to Affiliates Plan Investments Attributable to Affiliates [Member] Plan Investments Attributable to Affiliates Prior Service Cost [Member] Prior Service Cost [Member] Prior Service Cost [Member] Amortization of deferred net transition obligation Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, Tax Amortization of deferred net transition obligation, net of tax of $_, $0 and $0, respectively Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), 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Accumulated OCI, Net of Tax and Noncontrolling Interest Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Amortization of prior service credit, net of tax of ($0.6), ($0.6) and ($0.6), respectively Other Comprehensive Income (Loss) Amortization Defined Benefit Postretirement Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Tax Effect Tax effect on adjustment out of other comprehensive income for prior service costs recognized as a component of net periodic postretirement benefit cost during the period. 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Total deferred charges and other assets Other Assets, Noncurrent Minimum payout range Minimum payout range Minimum payout range Plan Name [Axis] Plan Name [Axis] Outstanding Intercompany Borrowings Outstanding Intercompany Borrowings Outstanding Intercompany Borrowings TOTAL ASSETS Total assets Assets Related Party Transactions Disclosure Related Party Transactions Disclosure [Text Block] Foreign government bonds [Member] Debt Security, Government, Non-US [Member] Equity Instruments Other than Options, Nonvested, Number, Beginning Balance Equity Instruments Other than Options, Nonvested, Number, Ending Balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Amortization of unrecognized prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Less: Deconsolidation of Enogex Holdings Noncontrolling Interest, Decrease from Deconsolidation Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Total liabilities Liabilities Estimated Refund to SPP Estimated Refund to SPP Estimated Refund to SPP Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months Postretirement Plan, Expected Future Benefit Payments in Year One Postretirement Plan, Expected Future Benefit Payments in Year One Summarized Financial Information of Equity Method Investment [Axis] Summarized Financial Information of Equity Method Investment [Axis] Summarized Financial Information of Equity Method Investment [Axis] Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Non-Retail Revenues [Axis] Non-Retail Revenues [Axis] Non-Retail Revenues [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Other Operations [Member] Other Segments [Member] Accumulated Benefit Obligation Accumulated Benefit Obligation Defined Benefit Plan, Accumulated Benefit Obligation Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Defined Benefit Plan, Plan Assets, Contributions by Plan Participant FERC [Member] FERC [Member] FERC [Member] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Regulated Operations [Abstract] Regulated Operations [Abstract] Fuel, materials and supplies inventories Increase (Decrease) in Inventories Unrecorded Unconditional Purchase Obligation, Due within Two Years Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two Redbud Plant [Member] Redbud Plant [Member] Redbud Plant [Member] Enogex [Member] Enogex [Member] Enogex [Member] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Increase in Tax Expense from Adjustment Increase in Tax Expense from Adjustment Increase in Tax Expense from Adjustment Deferred Pension Credit [Member] Deferred Pension Credit [Member] Deferred Pension Credits [Member] Premium on Common Stock Additional Paid-in Capital [Member] Lost Revenue on Plant Investments for Customers Lost Revenue on Plant Investments for Customers Lost Revenue on Plant Investments for Customers 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. Asset Class [Axis] Asset Class [Axis] 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 Other Other Assets, Miscellaneous, Noncurrent Accrued vacation Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Investment in unconsolidated affiliates Investment in unconsolidated affiliates Equity Method Investments Southeast Supply Header, LLC [Member] Southeast Supply Header, LLC [Member] Southeast Supply Header, LLC [Member] Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense The total tax benefit to be recognized in future periods related to compensation cost for equity-based payment arrangements. 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Paying out this amount would cause the Company to exceed it's debt to total capitalization ratio established by the Company's debt covenants. Schedule of Assumptions Used [Table Text Block] Defined Benefit Plan, Assumptions [Table Text Block] OG&E Tinker Debt [Member] OG and E Tinker Debt [Member] OG and E Tinker Debt [Member] Series Due January 15, 2036 [Member] Series Due January 15, 2036 [Member] Series Due January 15, 2036 [Member] Amortization of deferred net gain, net of tax of $0.0, $0.0 and $0.0, respectively Other Comprehensive Income Reclassification Of Defined Benefit Postretirement Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax Other Comprehensive Income Reclassification Of Defined Benefit Postretirement Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax Regulatory liabilities Non-Current Deferred Tax Assets, Regulatory Liabilities Non-Current Deferred Tax Assets, Regulatory Liabilities Series Due November 24, 2017 [Member] Series Due November 24, 2017 [Member] Series Due November 24, 2017 [Member] Scenario, Unspecified [Domain] Scenario [Domain] Uncollectible accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Amount of Acquistion Adjustments Related Accumulated Amortization Amount of Acquistion Adjustments Related Accumulated Amortization The amount of acquisition adjustments accumulated amortization included in property, plant and equipment (PPE) for utilities Long-Term Debt Long-term Debt [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Actual return on plans' assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan Common Stock, Capital Shares Reserved for Future Issuance Components of Benefit Obligation Regulatory Asset Components of Benefit Obligation Regulatory Asset Components of Benefit Obligation Regulatory Asset Property, Plant and Equipment [Table] Public Utility, Property, Plant and Equipment [Table] Equity in earnings (losses) of unconsolidated affiliates Equity in (earnings) losses of unconsolidated affiliates Equity in earnings of unconsolidated affiliates Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Arkansas Environmental [Member] Arkansas Environmental [Member] Arkansas Environmental Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Fuel clause over recoveries Increase (Decrease) In Deferred Fuel Costs Current Liabilities Increase (Decrease) In Deferred Fuel Costs Current Liabilities Expected Future Benefit Payments, Five Fiscal Years Thereafter Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Total Shareholder Return [Member] Total Shareholder Return [Member] Total Shareholder Return [Member] Short-Term Debt and Credit Facilities Short-term Debt [Text Block] Summary of Tax Credit Carryforwards [Table Text Block] Summary of Tax Credit Carryforwards [Table Text Block] Entity [Domain] Entity [Domain] Enable Gas Transportation and Storage Agreement [Domain] Enable Gas Transportation and Storage Agreement [Domain] [Domain] for Enable Gas Transportation and Storage Agreement [Axis] Interest and dividends receivable [Member] Interest and dividends receivable [Member] Interest and Dividends Receivable [Member] Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.0, respectively Other Comprehensive Income Amortization of Interest Rate Swap Net Of Tax Other Comprehensive Income Amortization of Interest Rate Swap Net Of Tax SmartHours Program [Member] SmartHours Program [Member] SmartHours [Member] 120% [Member] 120% [Member] 120% [Member] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment, Net [Abstract] Claims paid Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Claims Paid Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Claims Paid Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Claims Paid Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Oklahoma demand program rider over recovery Oklahoma demand program rider over recovery [Member] Oklahoma demand program rider over recovery Projected Benefit Obligation Funded Status Thresholds Fixed Income Projected Benefit Obligation Funded Status Thresholds Fixed Income Projected Benefit Obligation Funded Status Thresholds Fixed Income Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments Due, Next Twelve Months Payment for Pension Benefits Payment for Pension Benefits Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Reclassifications [Text Block] Reclassifications [Text Block] Other current assets Increase (Decrease) in Other Current Assets Share-based Compensation, Activity [Table Text Block] Share-based Payment Arrangement, Activity [Table Text Block] Restricted Stock [Member] Restricted Stock [Member] Mustang Modernization [Member] Mustang Modernization [Member] Mustang Modernization [Member] Debt Instrument, Repurchased Face Amount Debt Instrument, Repurchased Face Amount Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Ultimate Health Care Cost Trend 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respectively Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Percent Of Intangible Plant Balance Amortizable Percent Of Intangible Plant Balance Amortizable Percent Of Intangible Plant Balance Amortizable Excess Fuel Costs Excess Fuel Costs [Member] Excess Fuel Costs Oklahoma Industrial Electric Consumers [Member] Oklahoma Industrial Electric Consumers [Member] Oklahoma Industrial Electric Consumers [Member] New Source Review [Member] New Source Review [Member] New Source Review [Member] Components of Benefit Obligation Regulatory Asset [Table Text Block] Components of Benefit Obligation Regulatory Asset [Table Text Block] Components of Benefit Obligation Regulatory Asset [Table Text Block] Pension and Other Postretirement Plans, Policy [Policy Text Block] Pension and Other Postretirement Plans, Policy [Policy Text Block] Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Lost Revenue Associated with Customer Programs - recovered annually Lost Revenue Associated with Customer Programs - recovered annually Lost Revenue Associated with Customer Programs - recovered annually Revenue Cap [Domain] Revenue Cap [Domain] Revenue Cap OG&E long-term service agreement commitments [Member] OG&E long-term service agreement commitments [Member] OG&E long-term service agreement commitments [Member] Other Contracts with Customers [Member] Other Contracts with Customers [Member] Other Contracts with Customers [Member] Louisiana inventory credits [Member] [Member] [Domain] Louisiana inventory credits [Member] [Member] [Domain] Louisiana inventory credits [Member] [Member] [Domain] Interim Rate Revenue Reserved Interim Rate Revenue Reserved Interim Rate Revenue Reserved Depreciation, Depletion and Amortization [Abstract] Depreciation, Depletion and Amortization [Abstract] Operating income (loss) Operating Income (Loss) Provision for Rate Refund [Member] Provision for Rate Refund [Member] Provision for Rate Refund [Member] Transmission Equipment [Member] Transmission Equipment [Member] Transmission Equipment [Member] Deferred income taxes attributable to contributions from noncontrolling interest partners Deferred Income Taxes Attributable To Contributions From Noncontrolling Interest Partners Deferred income taxes arising from the cash inflow contributed by noncontrolling interests that purchase additional shares or otherwise increase their ownership stake in a subsidiary of the entity. Accrued Environmental Loss Contingencies, Noncurrent Accrued Environmental Loss Contingencies, Noncurrent COMMITMENTS AND CONTINGENCIES (NOTE 15) Commitments and Contingencies Total other property and investments Other Investments Increase in long-term revolver Payments for Repurchase of Common Stock Proposed Rate-Based Carbon Reduction Proposed Rate-Based Carbon Reduction Proposed Rate-Based Carbon Reduction Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, to be Paid, after Year Five Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value Accrued taxes Taxes Payable, Current Awards Other than Options, Fully Vested Awards Other than Options, Fully Vested Awards Other than Options, Fully Vested Entity Address, State or Province Entity Address, State or Province Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Accounts payable Accounts Payable, Current Retained earnings Retained earnings Retained Earnings (Accumulated Deficit) Fuel inventories Public Utilities, Inventory Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Adjustments for Error Correction [Domain] Error Correction, Type [Domain] Postretirement Plan, Expected Future Benefit Payments, Year Three Postretirement Plan, Expected Future Benefit Payments in Year Three Postretirement Plan, Expected Future Benefit Payments in Year Three Unamortized discount Debt Instrument, Unamortized Discount Accelerated depreciation and other property related differences Deferred Tax Liabilities, Property, Plant and Equipment OG&E Railcar Lease Agreement [Member] OG&E Railcar Lease Agreement [Member] OG&E Railcar Lease Agreement [Member] Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] Other Assets Deferred Costs and Other Assets STOCKHOLDERS' EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Fuel clause under recoveries Deferred Fuel Cost Schedule of Change in Asset Retirement Obligation [Table Text Block] Schedule of Change in Asset Retirement Obligation [Table Text Block] Customer [Axis] Customer [Axis] Income Taxes, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] 401(k) dividends Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent Allowance for Funds Used During Construction, Policy [Policy Text Block] Allowance for Funds Used During Construction, Policy [Policy Text Block] Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Balance at January 1 Balance at December 31 Asset Retirement Obligation Equity Instruments Other than Options, Converted in Period Equity Instruments Other than Options, Converted in Period Equity Instruments Other than Options, Converted in Period Construction work in progress Construction in Progress, Gross Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Investments Since Last Rate Case Investments Since Last Rate Case Investments Since Last Rate Case Revenue Cap [Axis] Revenue Cap [Axis] Revenue Cap Amount Attributable to Parent Amount Attributable to Parent Amount Attributable to Parent Plan settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Share Price Share Price Amount Recorded for Lost Revenue Associated with Customer Programs Amount Recorded for Lost Revenue Associated with Customer Programs Amount Recorded for Lost Revenue Associated with Customer Programs Regulatory Liability [Domain] Regulatory Liability [Domain] Regional Haze [Member] Regional Haze [Member] Regional Haze [Member] Settlement cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Schedule of Unamortized Computer Software Costs [Table Text Block] Schedule of Unamortized Computer Software Costs [Table Text Block] [Table Text Block] for Schedule of Unamortized Computer Software Costs [Table] Federal tax credits [Member] Federal tax credits [Member] [Member] Federal tax credits [Member] [Member] Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Amortization of basis difference and dilution recognition Equity in Earnings Amortization of Basis Difference Equity in Earnings Amortization of Basis Difference Tax Credit Carryforward, Expiration Date Tax Credit Carryforward, Expiration Date Accrued interest Interest Payable, Current Entity Voluntary Filers Entity Voluntary Filers 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] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Percent of Incentive Distribution Rights Percent of Incentive Distribution Rights Percent of Incentive Distribution Rights Regulatory File Date [Axis] Regulatory File Date [Axis] Regulatory File Date [Axis] OG&E Senior Notes [Member] Og and E Senior Notes [Member] Og and E Senior Notes [Member] Awards Other than Options, Vested and Expected to Vest, Outstanding Awards Other than Options, Vested and Expected to Vest Awards Other than Options, Vested and Expected to Vest Dry Scrubber Regulatory Asset [Member] Dry Scrubber Regulatory Asset [Member] Dry Scrubber Regulatory Asset [Member] Unamortized loss on reacquired debt [Member] Loss on Reacquired Debt [Member] Equity Instruments Other than Options, Expected to Vest, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Intrinsic Value Distribution Type [Axis] Distribution Type [Axis] Series Due August 15, 2028 [Member] [Member] Series Due August 15, 2028 [Member] [Member] Series Due August 15, 2028 [Member] [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Fuel Adjustment Clauses, Policy [Policy Text Block] Capitalization and Amortization of Fuel Costs, Policy [Policy Text Block] Unamortized debt expense Unamortized Debt Issuance Expense U.S. Equity Mutual Funds Investment [Member] U.S. Equity Mutual Funds Investment [Member] U.S. Equity Mutual Funds Investment [Member] Expense of common stock Proceeds from Issuance of Common Stock Grid Enhancement Grid Enhancement [Member] Grid Enhancement New Long-Term Service Agreement [Domain] New Long-Term Service Agreement [Domain] [Domain] for New Long-Term Service Agreement [Axis] Power plant long-term service agreement Power Plant Long-Term Service Agreement Power Plant Long-Term Service Agreement Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due Maturity Line of Credit Facility, Expiration Date Asset retirement obligations Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Electric Utility [Member] Electric Utility [Member] Electric Utility [Member] Amount Outstanding Long-term Line of Credit Series due August 15, 2047 [Member] [Domain] Series due August 15, 2047 [Member] [Domain] Series due August 15, 2047 [Member] [Domain] Fair Value Measurement, Policy Fair Value Measurement, Policy [Policy Text Block] Net Income Used to Calculate Equity in Earnings Net Income Used to Calculate Equity in Earnings Net Income Used to Calculate Equity in Earnings Reduction in net deferred income tax liability Reduction in net deferred income tax liability Reduction in net deferred income tax liability Total deferred credits and other liabilities Liabilities, Other than Long-term Debt, Noncurrent Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Net cash provided from operating activities Net Cash Provided by (Used in) Operating Activities Accrued Vacation, Policy [Policy Text Block] Accrued vacation policy [Policy Text Block] Accrued vacation policy [Policy Text Block] Entity Central Index Key Entity Central Index Key Related Party [Domain] Related Party [Domain] Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Remeasurement of state deferred tax liabilities Effective Income Tax Rate Reconciliation, Change in Deferred Tax Liabilities Valuation Allowance, Percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax liabilities. Cash collateral [Member] Cash Collateral [Member] Cash Collateral [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Partners' Capital Account, Units, Sold in Public Offering Partners' Capital Account, Units, Sold in Public Offering Amortization of prior service credit, net of tax of $0.0, $0.0 and $0.0, respectively Other Comprehensive Income Amortization Of Defined Benefit Pension Plans Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax Other Comprehensive Income Amortization Of Defined Benefit Pension Plans Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax Derivative, by Nature [Axis] Derivative Instrument [Axis] Pension tracker [Member] Pension tracker [Member] Pension tracker [Member] Reconciliation of Basis Difference [Table Text Block] Reconciliation of Basis Difference [Table Text Block] [Table Text Block] for Reconciliation of Basis Difference [Table] Customer Refund Amount Customer Refund Amount Customer Refund Amount Senior Notes [Member] Senior Notes [Member] Income taxes receivable Income Taxes Receivable, Current Generation Capacity Replacement rider Generation Capacity Replacement rider [Member] Generation Capacity Replacement rider Component of Accumulated Other Comprehensive Income Loss [Domain] Component of Accumulated Other Comprehensive Income Loss [Domain] Component of Accumulated Other Comprehensive Income Loss [Domain] Segments [Domain] Segments [Domain] Projected Benefit Obligation Funded Status Thresholds [Table Text Block] Projected Benefit Obligation Funded Status Thresholds [Table Text Block] Projected Benefit Obligation Funded Status Thresholds [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Line of Credit Facility [Abstract] Line of Credit Facility [Abstract] Long-term Debt, Maturities, Repayments of Principal in Year Four Long-Term Debt, Maturity, Year Four Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications in Period, Weighted Average Grant Date Fair Value Additional Requested Plant Dismantlement Cost Additional Requested Plant Dismantlement Cost Additional Requested Plant Dismantlement Cost Schedule of Line of Credit Facilities [Table Text Block] Schedule of Line of Credit Facilities [Table Text Block] Interest costs capitalized Interest Costs Capitalized Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Cash [Member] Cash [Member] Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share OG&E minimum fuel purchase commitments [Member] OG&E minimum fuel purchase commitments [Member] OG&E minimum fuel purchase commitments [Member] Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Adjustments for Change in Accounting Principle [Domain] Change in Accounting Principle, Type [Domain] Line of Credit Facility [Table] Line of Credit Facility [Table] Public Utilities, Allowance for Funds Used During Construction, Rate Public Utilities, Allowance for Funds Used During Construction, Rate Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Research and Development Credits [Member] Research and Development Credits [Member] Research and Development Credits Factored-Fired Starts Factored-Fired Starts Factored-Fired Starts Equity Method Investments and Joint Ventures Disclosure [Text Block] Equity Method Investments and Joint Ventures Disclosure [Text Block] Operating Lease Obligations [Axis] Operating Lease Obligations [Axis] Operating Lease Obligations [Axis] Report of Business Segments Segment Reporting Disclosure [Text Block] Purchase of treasury stock Stock Issued During Period, Value, New Issues Curtailment Curtailment [Member] Curtailment Other Comprehensive Income (Loss), Net of Tax, Number of Shares Other Comprehensive Income (Loss), Net of Tax, Number of Shares Other Comprehensive Income (Loss), Net of Tax, Number of Shares Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Defined Benefit Plan, Plan Assets, Category Defined Benefit Plan, Plan Assets, Category [Table Text Block] Fair Value of Vested Performance Units and Restricted Stock [Table Text Block] Fair Value of Vested Performance Units and Restricted Stock [Table Text Block] Fair Value of Vested Performance Units and Restricted Stock [Table Text Block] Scenario [Axis] Statement, Scenario [Axis] Scenario [Axis] Title of 12(b) Security Title of 12(b) Security Percentage of Enogex LLC Contributed Percentage of Enogex LLC Contributed Percentage of Enogex LLC Contributed 110% [Member] 110% [Member] 110% [Member] Employment Costs [Member] Employment Costs [Member] Employment Costs [Member] January 16, 2018 [Member] January 16, 2018 [Member] January 16, 2018 [Member] Interest expense Interest expense Interest Expense Schedule of Capitalization [Table] Schedule of Capitalization [Table] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Energy Transfer Energy Transfer [Member] Energy Transfer Available Optional Increase of Borrowing Capacity in Credit Facility Available Optional Increase of Borrowing Capacity in Credit Facility Available Optional Increase of Borrowing Capacity in Credit Facility Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease) Proceeds from sale of assets Proceeds from Sale of Productive Assets Transmission [Member] Transmission [Member] Transmission [Member] Defined Benefit Plan Prior Service Cost [Member] Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Total Compensation Cost Not yet Recognized, Period for Recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Public Authority [Member] Public Authority [Member] Public Authority [Member] Deferred Pension Expenses [Member] Deferred Pension Expenses [Member] Deferred Pension Expenses [Member] Equity Instruments Other Than Options, Modification Equity Instruments Other Than Options, Modification Equity Instruments Other Than Options, Modification Og and E [Member] OG&E [Member] Og and E [Member] Og and E [Member] Long-term Debt, Maturities, Repayments of Principal in Year Two Long-Term Debt, Maturity, Year Two SPP cost tracker under recovery [Member] SPP Cost Tracker Rider Under Recovery [Member] SPP Cost Tracker Rider Under Recovery [Member] Short Term Borrowing Capacity That Has Regulatory Approval Short Term Borrowing Capacity That Has Regulatory Approval Short Term Borrowing Capacity That Has Regulatory Approval Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Postretirement Plan, Expected Future Benefit Payments, Year Two Postretirement Plan, Expected Future Benefit Payments in Year Two Postretirement Plan, Expected Future Benefit Payments in Year Two Liabilities settled Asset Retirement Obligation, Liabilities Settled Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Recommended Increase (Decrease) in Revenue Recommended Increase (Decrease) in Revenue Recommended Increase (Decrease) in Revenue Estimated Refund to SPP [Axis] Estimated Refund to SPP [Axis] Estimated Refund to SPP [Axis] Accounts payable Increase (Decrease) in Accounts Payable Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Total Plan investments [Member] Total Plan investments [Member] Total Plan Investments [Member] Estimated Refund to SPP [Domain] Estimated Refund to SPP [Domain] Estimated Refund to SPP Debt Instrument [Axis] Debt Instrument [Axis] Asset Retirement Obligation Disclosure [Text Block] Asset Retirement Obligation Disclosure [Text Block] Revenue Cap [Member] Revenue Cap [Member] Revenue Cap Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Other comprehensive loss from unconsolidated affiliates, net of tax ($0.2), ($0.2) and $0.0, respectively Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Adjustments to reconcile net income (loss) to net cash provided from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Provision for Depreciation Rate Provision for Depreciation Rate Provision for Depreciation Rate Distributions from unconsolidated affiliates increase decrease in distributions from unconsolidated affiliates increase decrease in distributions from unconsolidated affiliates Electric Transmission and Distribution [Member] Electric Distribution [Member] OGE Holdings [Member] OGE Holdings [Member] OGE Holdings [Member] Reclassifications [Text Block] Reclassification, Comparability Adjustment [Policy Text Block] Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Leases of Lessee Disclosure Leases of Lessee Disclosure [Text Block] OKLAHOMA OKLAHOMA Clean Power Plan [Member] Clean Power Plan [Member] Clean Power Plan [Member] Revenue Recognition, Policy [Policy Text Block] Revenue [Policy Text Block] OG&E expected wind purchase commitments [Member] OG&E expected wind purchase commitments [Member] OG&E expected wind purchase commitments [Member] Garfield Industrial Authority Bond [Member] Garfield Industrial Authority, January 1, 2025 [Member] Garfield Industrial Authority Bond [Member] Garfield Industrial Authority Bond [Member] Distribution Made to Limited Partner, Cash Distributions Paid Distribution Made to Limited Partner, Cash Distributions Paid Postretirement benefit plans: Postretirement plans: Defined Benefit Postretirement Plans [Abstract] -- None. No documentation exists for this element. -- Type of Acceleration of Debt [Domain] Type of Acceleration of Debt [Domain] [Domain] for Type of Acceleration of Debt [Axis] Additional Factored-Fired Hours Additional Factored-Fired Hours Additional Factored-Fired Hours Component of Accumulated Other Comprehensive Income [Axis] Component of Accumulated Other Comprehensive Income [Axis] Component of Accumulated Other Comprehensive Income [Axis] Adjustments for Change in Accounting Principle [Axis] Change in Accounting Principle, Type [Axis] Depreciation and Amortization, Policy [Policy Text Block] Depreciation, Depletion, and Amortization [Policy Text Block] Administrative Law Judge [Member] Administrative Law Judge [Member] Administrative Law Judge [Member] Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Effective Income Tax Rate Reconciliation, Tax Contingency, Percent CURRENT ASSETS Assets, Current [Abstract] 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 Series Due July 15, 2017 [Member] Series Due July 15, 2017 [Member] Series Due July 15, 2017 [Member] OG&E cogeneration capacity and fixed operation and maintenance payments [Member] OG&E cogeneration capacity and fixed operation and maintenance payments [Member] OG&E cogeneration capacity and fixed operation and maintenance payments [Member] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income attributable to OGE Energy Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Uninsured Judgements [Member] Uninsured Judgements [Member] Uninsured Judgements [Member] Total Non-Current Deferred Income Tax Assets Deferred Tax Assets, Gross, Noncurrent Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-Term Debt, Maturity, Year One Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Electric Generation Equipment [Member] Electric Generation Equipment [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction OCI, before Reclassifications, Net of Tax, Attributable to Parent OCI, before Reclassifications, Net of Tax, Attributable to Parent City Area Code City Area Code Legal Entity [Axis] Legal Entity [Axis] Curtailment cost, net of tax of ($0.1), $0.0 and $0.0, respectively Other Comprehensive Income Prior Service Credit Arising During The Period Recognized In Net Periodic Postretirement Cost Net of Tax Other Comprehensive Income Prior Service Credit Arising During The Period Recognized In Net Periodic Postretirement Cost Net of Tax Income Tax Authority [Axis] Income Tax Authority [Axis] Document Period End Date Document Period End Date Unrecorded Unconditional Purchase Obligation, Due within Three Years Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax NET INCOME (LOSS) Net income (loss) Net income attributable to OGE Energy Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Accounts receivable - unconsolidated affiliates Accounts Receivable, Related Parties, Current Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Smart Grid [Member] Smart Grid [Member] Smart Grid [Member] Pension Plans [Member] Pension Plans [Member] Pension Plan [Member] Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Additions Asset Retirement Obligation, Liabilities Incurred Stock Issued During Period, Value, New Issues, Number of Shares Stock Issued During Period, Value, New Issues, Number of Shares Stock Issued During Period, Value, New Issues, Number of Shares Other comprehensive income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Increase (decrease) in short-term debt Proceeds from (Repayments of) Short-term Debt Capital expenditures (less allowance for equity funds used during construction) Payments to Acquire Productive Assets Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] Impact to Company [Member] Impact to Company [Member] Impact to Company [Member] Other Proceeds from (Payments for) Other Financing Activities Pension Plan Equity Asset Allocation Table [Table Text Block] Pension Plan Equity Asset Allocation Table [Table Text Block] Pension Plan Equity Allocation Table [Table Text Block] Rate Matters and Regulation 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. Regulatory Asset [Domain] Regulatory Asset [Domain] Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Distributions received Proceeds from Equity Method Investment, Distribution Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Series Due March 15, 2030 Series Due March 15, 2030 [Member] Series Due March 15, 2030 115% [Member] 115% [Member] 115% [Member] Amount paid by unconsolidated affiliates Amount Attributable to Unconsolidated Affiliates Amount Attributable to Unconsolidated Affiliates Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Accrued removal obligations [Member] Accrued removal obligations [Member] Accrued removal obligations [Member] Total long-term debt Total long-term debt Total long-term debt Long-term Debt Debentures Subject to Mandatory Redemption [Member] Redeemable during the next 12 months Debentures Subject to Mandatory Redemption [Member] Lessee, Operating Leases Lessee, Operating Leases [Text Block] Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Effect of One Percentage Point Decrease on Service and Interest Cost Components Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components Service cost Defined Benefit Plan, Service Cost Level 3 Asset Value, Beginning of Period Level 3 Asset Value, End of Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total cost of sales Cost of sales Cost of Goods and Services Sold Federal tax credits Current Deferred Tax Assets, Federal Tax Credits Current Deferred Tax Assets, Federal Tax Credits Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Lost Revenue Associated with Customer Programs Lost Revenue Associated with Customer Programs Lost Revenue Associated with Customer Programs Public Utilities, Property, Plant and Equipment, Construction Work in Progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress OG&E's Jurisdictional Revenues OG&E's Jurisdictional Revenues OG&E's Jurisdictional Revenues Asset Retirement Obligation [Policy Text Block] Asset Retirement Obligation [Policy Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum [Member] Minimum [Member] Enable Gas Transportation and Storage Agreement [Axis] Enable Gas Transportation and Storage Agreement [Axis] Enable Gas Transportation and Storage Agreement [Axis] OG&E capacity payments [Member] OG&E capacity payments [Member] OG&E capacity payments [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] OGE Energy Senior Notes [Member] Oge Energy Senior Notes [Member] Oge Energy Senior Notes [Member] Equity Method Investment, Other than Temporary Impairment Equity Method Investment, Other than Temporary Impairment Equity Method Investment, Other than Temporary Impairment Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] ARKANSAS ARKANSAS OTHER PROPERTY AND INVESTMENTS Other property and investments [Abstract] Other property and investments [Abstract] Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Retained Earnings, Unrestricted Retained Earnings, Unrestricted The amount of retained earnings which are available to be paid out in dividends. Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Amortization of Gain (Loss) Entity Interactive Data Current Entity Interactive Data Current Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Components of Benefit Obligation Regulatory Asset [Axis] Components of Benefit Obligation Regulatory Asset [Axis] Components of Benefit Obligation Regulatory Asset [Axis] Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Allocation of Plan Assets [Table Text Block] OPERATING REVENUES Revenues [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Commodity Contract [Member] Commodity Contract [Member] Share-based Compensation, Option and Incentive Plans, Policy [Policy Text Block] Share-based Payment Arrangement [Policy Text Block] OG&E Wind Farm Land Lease Agreements [Member] OG&E Wind Farm Land Lease Agreements [Member] OG&E Wind Farm Land Lease Agreements Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Interest-bearing cash [Member] Interest-bearing Deposits [Member] Expected Future Benefit Payments, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payment, Year One Other operation and maintenance Other Cost and Expense, Operating Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension and Other Postretirement Benefits Cost (Reversal of Cost) Pension and Other Postretirement Benefits Cost (Reversal of Cost) Property, Plant and Equipment, Other Types [Member] Property, Plant and Equipment, Other Types [Member] Customer Impact [Member] Customer Impact [Member] Customer Impact [Member] Treasury futures, payable [Member] Treasury futures, payable [Member] Treasury futures, payable [Member] Valuation Allowances and Reserves, Charged to Cost and Expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Retirement Plan Name, Other Retirement Plan Name, Other [Member] Goodwill, Impairment Loss Goodwill, Impairment Loss Goodwill, Impairment Loss Accounts receivable, after allowance for doubtful accounts Accounts Receivable, after Allowance for Credit Loss, Current Accumulated other comprehensive income (loss) Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, to be Paid Recommended Rate Increase (Decrease) Recommended Rate Increase (Decrease) Recommended Rate Increase (Decrease) Other Deferred Tax Assets, Other Projected Benefit Obligation Funded Status Thresholds Equity Projected Benefit Obligation Funded Status Thresholds Equity Projected Benefit Obligation Funded Status Thresholds Equity Postemployment Benefit Plans, Policy [Policy Text Block] Postemployment Benefit Plans, Policy [Policy Text Block] Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] ArcLight group [Member] ArcLight group [Member] ArcLight Group [Member] Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Materials and supplies, at average cost Other Inventory, Supplies, Gross Oklahoma Public Utility Division Staff [Member] Oklahoma Public Utility Division Staff [Member] Oklahoma Public Utility Division Staff [Member] Realized losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Realized Gains (Losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Realized Gains (Losses) Deconsolidation of Enogex Holdings Deconsolidation of subsidiary Deconsolidation of subsidiary Amounts reclassified from accumulated other comprehensive income (loss) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Document Transition Report Document Transition Report Type of Acceleration of Debt [Axis] Type of Acceleration of Debt [Axis] Type of Acceleration of Debt [Axis] Investment in Enable Non-Current Deferred Tax Liabilities, Investment in Enable Midstream Partners Non-Current Deferred Tax Liabilities, Investment in Enable Midstream Partners Contributions to Pay Down Short-Term Debt Contributions to Pay Down Short-Term Debt Contributions to Pay Down Short-Term Debt OTHER INCOME (EXPENSE) Nonoperating Income (Expense) [Abstract] Prior service cost arising during the period, net of tax of $0.0, $0.0 and $0.0, respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Projected Benefit Obligation Funded Status Thresholds Projected Benefit Obligation Funded Status Thresholds Projected Benefit Obligation Funded Status Thresholds Pension Plan Deferred Tax Liabilities, Prepaid Expenses Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] 2-for-1 forward stock split Adjustments to Additional Paid in Capital, Stock Split Proceeds from Unsecured Lines of Credit Proceeds from Unsecured Lines of Credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Muskogee Industrial Authority Bond Due 2027 [Member] Muskogee Industrial Authority, June 1, 2027 [Member] Muskogee Industrial Authority Bond Due 2027 [Member] Muskogee Industrial Authority Bond Due 2027 [Member] Reduction to Requested Additional Plant Dismantlement Costs Reduction to Requested Additional Plant Dismantlement Costs Reduction to Requested Additional Plant Dismantlement Costs New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Accounting Standards Update and Change in Accounting Principle [Text Block] Mutual fund [Member] Mutual Fund [Member] BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE Basic earnings per average common share attributable to OGE Energy common shareholders Earnings Per Share, Basic Unrecognized Tax Benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Entity File Number Entity File Number Curtailment Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Accrued benefit obligations Liability, Defined Benefit Plan, Noncurrent Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Series Due February 1, 2038 [Member] Series Due February 1, 2038 [Member] Series Due February 1, 2038 [Member] Percentage Share of Management Rights Percentage Share of Management Rights Percentage Share of Management Rights Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Investment in Grid Enhancement Investment in Grid Enhancement Investment in Grid Enhancement Contributions from noncontrolling interest partners Contributions from noncontrolling interest partners Proceeds from Noncontrolling Interests Dividends, Common Stock Dividends, Common Stock Dividends, Common Stock Compensation Expense Share-based Payment Arrangement, Expense Payable to broker for securities purchased [Member] Payable to broker for securities purchased [Member] Payable to Broker for Securities Purchased [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Postemployment Benefits Liability Postemployment Benefits Liability Document Annual Report Document Annual Report Smart Grid Capital Costs [Domain] Smart Grid Capital Costs [Domain] Smart Grid Capital Costs [Domain] International Equity [Member] International Equity [Member] International Equity [Member] Short-term Debt [Abstract] Short-term Debt [Abstract] Tax Benefit from Compensation Expense Share-based Payment Arrangement, Expense, Tax Benefit Public Utilities, Amount Requested for Acquisition Public Utilities, Amount Requested for Acquisition Public Utilities, Amount Requested for Acquisition Retirement Benefits [Abstract] Retirement Benefits [Abstract] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] 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 Public Utilities, Inventory, Fuel [Member] Public Utilities, Inventory, Fuel [Member] Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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 Muskogee Industrial Authority Bond Due 2025 [Member] Muskogee Industrial Authority, Janaury 1, 2025 [Member] Muskogee Industrial Authority Bond Due 2025 [Member] Muskogee Industrial Authority Bond Due 2025 [Member] Short-term debt Short-term Debt Federal deferred tax revaluation Federal tax percentage revaluation Federal tax percentage revaluation Document Information, Document [Axis] Document Information, Document [Axis] CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Administrative expenses and charges Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Administrative Expenses and Charges Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Administrative Expenses and Charges Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Administrative Expenses and Charges Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Mortgage-backed securities [Member] Collateralized Mortgage Backed Securities [Member] Capitalized Computer Software, Gross Capitalized Computer Software, Net Interest Expense [Member] Interest Expense [Member] Amounts reclassified from accumulated other comprehensive income (loss) Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Series Due August 1, 2034 [Member] Series Due August 1, 2034 [Member] Series Due August 1, 2034 [Member] Accounts receivable and accrued unbilled revenues, net Increase (Decrease) in Accounts Receivable Common Equity Dividend Restrictions [Abstract] Common Equity Dividend Restrictions [Abstract] Common Equity Dividend Restrictions [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] Postretirement Plan, Expected Future Benefit Payments in Year Four Postretirement Plan, Expected Future Benefit Payments in Year Four Postretirement Plan, Expected Future Benefit Payments in Year Four Oklahoma zero emission tax credits [Member] Oklahoma zero emission tax credits [Member] [Member] Oklahoma zero emission tax credits [Member] [Member] Operating Leases, Rent Expense, Net Operating Leases, Rent Expense, Net Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Loss Contingencies [Line Items] Loss Contingencies [Line Items] Acceleration of Indebtedness of Credit Facility Acceleration of Indebtedness of Credit Facility Acceleration of Indebtedness of Credit Facility Accumulated other comprehensive loss, net of tax Accumulated other comprehensive (income) loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Liabilities, Noncurrent Liabilities, Noncurrent Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Change due to Tax Law [Axis] Change due to Tax Law [Axis] Change due to Tax Law [Axis] Operating Lease, Cost Operating Lease, Cost Series Due July 15, 2027 [Member] Series Due July 15, 2027 [Member] Series Due July 15, 2027 [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Public Utilities, Requested Equity Capital Structure, Percentage Public Utilities, Requested Equity Capital Structure, Percentage Prior year additions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Current year additions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Equity Component [Domain] Equity Component [Domain] Equity Component [Domain] Summarized Financial Information of Equity Method Investment [Line Items] Summarized Financial Information of Equity Method Investment [Line Items] [Line Items] for Summarized Financial Information of Equity Method Investment [Table] Summarized Financial Information of Equity Method Investment [Domain] Summarized Financial Information of Equity Method Investment [Domain] [Domain] for Summarized Financial Information of Equity Method Investment [Axis] Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Postretirement medical and life insurance benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Schedule of Expected Benefit Payments [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Net property, plant and equipment Property, Plant and Equipment, Net Entity Tax Identification Number Entity Tax Identification Number Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Share-based Payment Arrangement [Text Block] Net Income (Loss) Attributable to Parent NET INCOME ATTRIBUTABLE TO OGE ENERGY Net Income (Loss) Attributable to Parent Change in certain current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Inventory Disclosure [Text Block] Inventory Disclosure [Text Block] Federal operating loss [Member] Federal operating loss [Member] [Member] Federal operating loss [Member] [Member] Deferred Tax Asset [Member] Deferred Tax Asset [Member] Deferred Tax Asset Current Fiscal Year End Date Current Fiscal Year End Date OPERATING EXPENSES Operating Expenses [Abstract] Adjustments for Error Corrections [Axis] Error Correction, Type [Axis] Deferred commodity contracts hedging (gains) losses reclassified in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Smart Grid Capital Costs [Axis] Smart Grid Capital Costs [Axis] Smart Grid Capital Costs [Axis] Other income Other Nonoperating Income Allowance for borrowed funds used during construction Public Utilities, Allowance for Funds Used During Construction, Additions Prior Period Reclassification Adjustment Prior Period Reclassification Adjustment DEFERRED CREDITS AND OTHER LIABILITIES Liabilities, Other than Long-term Debt, Noncurrent [Abstract] Federal tax credits Tax Credit Carryforward, Deferred Tax Asset Deferred Tax Assets, Tax Credit Carryforwards Reduction in income tax expense Reduction in income tax expense reduction in income tax expense Timing Differences Related to Equity Method Investee Net Income Timing Differences Related to Equity Method Investee Net Income Timing Differences Related to Equity Method Investee Net Income Redemption Premium Redemption Premium Amortization of prior service credit, net of tax of $0.0, $0.0 and $0.0, respectively Other Comprehensive Income Amortization of Defined Benefit Pension Plan and Restoration Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax Other Comprehensive Income Amortization of Defined Benefit Pension Plan and Restoration Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Subordinated Units Held by Limited Partners of the LLC or LP Subordinated Units Held by Limited Partners of the LLC or LP The number of subordinated units held by one or more members or limited partners of the LLC or LP. Environmental Compliance [Domain] Environmental Compliance [Domain] [Domain] for Environmental Compliance [Axis] Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.0, respectively Other Comprehensive Income Reclassification Adjustment On Interest Rate Swaps Included In Net Income Tax Other Comprehensive Income Reclassification Adjustment On Interest Rate Swaps Included In Net Income, Tax Loss Contingency, Range of Possible Loss, Maximum Loss Contingency, Estimate of Possible Loss Investment Tax Credit Investment Tax Credit Common Stock, Terms of Conversion Common Stock, Terms of Conversion Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Domestic All-Cap/Large Cap Equity [Member] Domestic All-Cap/Large Cap Equity [Member] Domestic All-Cap/Large Cap Equity [Member] Natural Gas Midstream Operations [Member] Natural Gas Midstream Operations [Member] Midstream Operations [Member] Interest income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Interest Income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Interest Income Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Inventory [Domain] Inventory [Domain] Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Postretirement Plan, Expected Future Benefit Payments Thereafter Postretirement Plan, Expected Future Benefit Payments Thereafter Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Louisiana inventory credits Louisiana inventory credits [Member] Louisiana inventory credits Derivative instruments Deferred Tax Liabilities, Derivatives U.S. treasury notes and bonds [Member] US Treasury Securities [Member] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, Dividend Reinvestment Plan and Stock Purchase Plan Stock Issued During Period, Shares, New Issues Common stockholders' equity Common Stocks, Including Additional Paid in Capital Dividend income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Dividends Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Dividends OG&E total cogeneration payments [Member] OG&E total cogeneration payments [Member] OG&E total cogeneration payments [Member] FPL Energy [Member] FPL Energy [Member] FPL Energy [Member] Money market funds [Member] Money Market Funds [Member] Schedule of Computer Software Costs, Amortization [Table Text Block] Schedule of Computer Software Costs, Amortization [Table Text Block] Schedule of Computer Software Costs, Amortization [Table Text Block] Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Less: accumulated depreciation Accumulated Depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Curtailment cost, net of tax of ($0.1), $0.0 and $0.0, respectively Other Comprehensive Income Loss Prior Service Credit Arising During The Period Recognized In Net Periodic Benefit Cost Tax Effect Other Comprehensive Income Loss Prior Service Credit Arising During The Period Recognized In Net Periodic Benefit Cost Tax Effect Related Party Transactions [Abstract] Related Party Transactions [Abstract] Schedule of Nonvested Share Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Change in Allowed Amount [Axis] Change in Allowed Amount [Axis] Change in Allowed Amount [Axis] Mass-Based Carbon Reduction Mass-Based Carbon Reduction Mass-Based Carbon Reduction Basis of Accounting, Policy [Policy Text Block] Basis of Accounting, Policy [Policy Text Block] Unrealized gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Unrealized Gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Unrealized Gains BASIC AVERAGE COMMON SHARES OUTSTANDING Basic Average Common Shares Outstanding Weighted Average Number of Shares Outstanding, Basic Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Document Information [Line Items] Document Information [Line Items] Jurisdiction [Axis] Jurisdiction [Axis] Treasury Stock, Common, Shares Treasury Stock, Common, Shares Percent of Principal Amount Subject to Optional Tender Percent of Principal Amount Subject to Optional Tender Percent of Principal Amount Subject to Optional Tender 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. Loss Contingencies [Table] Loss Contingencies [Table] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Change due to Tax Law [Domain] Change due to Tax Law [Domain] [Domain] for Change due to Tax Law [Axis] Transmission Cost Recovery Rider [Member] Transmission Cost Recovery Rider [Member] transmission cost recovery rider [Member] Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value Plan Name [Domain] Plan Name [Domain] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Other current liabilities Increase (Decrease) in Other Current Liabilities OGE Energy Building Lease [Member] OGE Energy Building Lease [Member] Building Lease [Member] Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Actuarial losses Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Long-Term Debt, Fair Value Long-term Debt, Fair Value Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] INCOME TAX EXPENSE (BENEFIT) Income Tax Expense (Benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Year that Rate Reaches Ultimate Trend Rate Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Five Years Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Local Phone Number Local Phone Number Finite-Lived Intangible Assets, Major Class Name [Member] Finite-Lived Intangible Assets, Major Class Name [Member] Finite-Lived Intangible Assets, Major Class Name [Member] Defined Benefit Plans Income Loss [Member] Defined Benefit Plans Income Loss [Member] Defined Benefit Plans Income Loss [Member] Options, Exercises in Period, Total Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Amortization of Defined Benefit Pension Items, Amount Reclassified from Accumulated OCI, Noncontrolling Interest Amortization of Defined Benefit Pension Items, Amount Reclassified from Accumulated OCI, Noncontrolling Interest Amortization of Defined Benefit Pension Items, Amount Reclassified from Accumulated OCI, Noncontrolling Interest Long-term Debt, Gross Long term debt, gross Long-term Debt, Gross Series Due June 1, 2040 [Member] Series Due June 1, 2040 [Member] Series Due June 1, 2040 [Member] SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Percentage of output purchased Percentage of output purchased Percentage of output purchased December 13, 2017 [Member] December 13, 2017 [Member] December 13, 2017 [Member] Change in Allowed Amount [Domain] Change in Allowed Amount [Domain] [Domain] for Change in Allowed Amount [Axis] Series Due May 1, 2043 [Member] Series due May 1, 2043 [Member] Series due May 1, 2043 [Member] Aggregate Commitment Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Regulatory Asset [Member] Regulatory Asset [Member] Regulatory Asset [Member] Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Other Regulatory Liabilities [Member] Other Regulatory Liabilities [Member] Other Regulatory Liabilities [Member] Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Retained Earnings Retained Earnings [Member] Retained Earnings [Member] Fuel recoveries Increase (Decrease) in Deferred Fuel Costs Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Revisions in estimated cash flows Asset Retirement Obligation, Revision of Estimate Projected provision for depreciation in next fiscal year Projected provision for depreciation in next fiscal year Projected provision for depreciation in next fiscal year Property, Plant and Equipment [Line Items] Public Utility, Property, Plant and Equipment [Line Items] Components of Benefit Obligation Regulatory Asset [Domain] Components of Benefit Obligation Regulatory Asset [Domain] Components of Benefit Obligation Regulatory Asset [Domain] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Regulatory liabilities Increase (Decrease) in Regulatory Liabilities Equity Other Than Options, Employee Migration Equity Other Than Options, Employee Migration Equity Other Than Options, Employee Migration Equity Award [Domain] Award Type [Domain] Long-term Debt, Unclassified [Abstract] Long-term Debt, Unclassified [Abstract] Corporate fixed income and other securities [Member] Corporate Debt Securities [Member] Schedule of Regulatory Assets and Liabilities [Table] Schedule of Regulatory Assets and Liabilities [Table] Schedule of Regulatory Assets and Liabilities [Table] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Other Commitment Other Commitment Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Bond redemption-unamortized costs Deferred Tax Liabilities, Unamortized Bond Redemption Costs Deferred Tax Liabilities, Unamortized Bond Redemption Costs 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 Fair Value of Vested Performance Units and Restricted Stock Fair Value of Vested Performance Units and Restricted Stock Fair Value of Vested Performance Units and Restricted Stock Treasury Stock, Value Treasury Stock, Value Pension Plan [Member] Pension Plans, Defined Benefit [Member] Pension Plan [Member] INTEREST EXPENSE Interest Expense [Abstract] Income taxes recoverable from customers, net [Member] Income taxes recoverable from customers, net [Member] Income taxes recoverable from customers, net [Member] Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Lessee, Operating Lease, Contingent Liability Lessee, Operating Lease, Contingent Liability Lessee, Operating Lease, Contingent Liability CURRENT LIABILITIES Liabilities, Current [Abstract] Estimated Environmental Capital Costs Estimated Environmental Capital Costs Estimated Environmental Capital Costs Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of Jointly Owned Utility Plants [Table Text Block] Schedule of Jointly Owned Utility Plants [Table Text Block] Accretion expense Asset Retirement Obligation, Accretion Expense Shares Paid for Tax Withholding Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]