75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Plan Description link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Income Tax Status link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Related Party and Party-in-Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Plan Description - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Fair Value Measurements - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Fair Value Measurements - Summary of Plan's Investments Measured at Fair Value on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Income Tax Status - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Related Party and Party-in-Interest Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] ADDITIONS EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Distributions to participants Fair Value, Inputs, Level 2 [Member] Level 2 EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus EBP, Tax Status [Abstract] EBP, Forfeited Nonvested Account Forfeited non-vested participant balances EBP, Description of Plan [Text Block] Plan Description Interest on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses Employee Benefit Plan Participants Obtaining Loan Charged Employee Benefit Plan Participants Obtaining Loan Charged. Participants obtaining a loan charged EBP, Description of Plan [Line Items] EBP, Percentage of employer contributions EBP, Employer Contribution, Matching Percentage EBP, Investment, Issuer Name [Extensible Enumeration] Employee Benefit Plan Payment Of Benefits Employee benefit plan payment of benefits. Payment of employee benefit EBP, Investment, Fair Value and NAV [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Noncash EBP, Employer Contribution, Noncash EBP, Accounting Policy [Line Items] Share Valuation - OGE Energy Corp. Common Stock Fund Employee Benifit Plan Share Valuation Common Stock Fund [Policy Text Block] Employee benifit plan share valuation common stock fund. EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Employee Benefit Plan Allowance For Credit Losses Employee benefit llan allowance for credit losses. Allowance for credit losses EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable, maximum borrowing amount EBP, Nonemployer, Common Stock [Member] Common Stock Stable Value Collective Trust Common Collective Trust [Member] Amendment Flag DEDUCTIONS EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP, Blackrock Inc. [Member] EBP, Blackrock Inc. BlackRock, Inc. Participant contributions receivable EBP, Participant Contribution, Receivable EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Document Type Entity Central Index Key EBP, Self-Directed Brokerage Account [Member] Self-directed Brokerage Account EBP, Forfeited nonvested unallocated to participant EBP, Forfeited Nonvested Account, Reallocated to Participant EBP, Investment [Policy Text Block] Investments EBP 003 [Member] EBP 003. EBP 003 EBP, Accounting Policy [Table] Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Current Fiscal Year End Date EBP, Description of Plan [Table] EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Interest and dividend income EBP, Investment, Excluding Plan Interest in Master Trust, Cost Cost EBP, Vanguard Group [Member] EBP, Vanguard Group. Vanguard Group EBP, Noninterest-Bearing Cash Non-interest bearing cash Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party and Party-in-Interest Transactions EBP, Change in Net Asset Available for Benefit, Increase Total additions Fair Value, Inputs, Level 3 [Member] Level 3 EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Employee Benefit Plan Forfeited Vested Account Employee Benefit Plan Forfeited Vested Account. EBP, participant's vested account Document Information [Line Items] EBP, Statement of Net Asset Available for Benefit [Abstract] Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: Employee Benefit Plan Vesting Percentage Employee benefit plan vesting percentage. Employee benefit plan, vesting percentage EBP, Tax Determination Letter, Date Determination letter, date EBP, Related Party and Party-in-Interest Transactions [Abstract] Freeze Options [Member] Freeze Options. Freeze Options EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Total Investments at fair value Use of Estimates EBP, Use of Estimate [Policy Text Block] Employee Benefit Plan Benefits Paid Employee benefit plan benefits paid. Employee benefits paid Mutual Fund [Member] Mutual Funds Entity [Domain] EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Description of Plan and Accounting Change [Abstract] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Current Value EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] EBP, Note Receivable from Participant Notes receivable from participants Document Period End Date Fair Value Hierarchy and NAV [Domain] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable, maximum borrowing percentage of account balance EBP, Tax Determination Letter, Obtained [true false] Determination letter, obtained EBP, Related Party and Party-in-Interest Transactions [Table] Employee Benefit Plan, Participant Loan, Basis Spread on Variable Rate Employee Benefit Plan, Participant Loan, Basis Spread on Variable Rate. Spread on prime rate Company Employee Benefit Plan Change In Net Asset Available For Benefit Increase For Participant Contribution Company Employee benefit plan change in net asset available for benefit increase for participant contribution company. Cover [Abstract] Interest-Bearing Deposits [Member] Interest-bearing Cash Investments [Domain] Net assets available for benefits EBP, Net Asset Available for Benefit Beginning of year End of year EBP, Investment, Fair Value and NAV [Table Text Block] Summary of Plan's Investments Measured at Fair Value on a Recurring Basis EBP, Schedule of Asset Held for Investment [Abstract] EBP, Matching Tier One [Member] EBP, Matching Tier One. Less Than 20 Years of Service EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value Notes Receivable from Participants (Participant Loans) EBP, Note Receivable from Participant [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table Text Block] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Net appreciation in fair value of investments EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Table] Employee Benefit Plan Statement Of Change In Net Asset Available For Benefits [Abstract] Employee Benefit Plan Statement Of Change In Net Asset Available For Benefits. NET ASSETS AVAILABLE FOR BENEFITS EBP, Matching Tier Two [Member] EBP, Matching Tier Two. 20 or More Years of Service Employee Benefit Plan from Administrative Expense for Maintenance Employee Benefit Plan from Administrative Expense for Maintenance. Administrative expenses for maintenance EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan, participant contribution, pretax, maximum annual compensation to total compensation, percentage Employee Benefit Plan Forfeited Nonvested Employee Benefit Plan Forfeited Nonvested. EBP, Forfeited nonvested EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Document Information [Table] Legal Entity [Axis] EBP, Plan Name EBP, Contribution Tranche [Domain] EBP, Contribution Tranche. EBP, Investment, Fair Value and NAV [Table] Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Asset Held for Investment EBP, Asset Held for Investment, Total Current Value Employee Benefit Plan, Participant Loan, General Purpose, Maximum Repayment Term Employee Benefit Plan, Participant Loan, General Purpose, Maximum Repayment Term. General purpose loan, maximum repayment term EBP, Tax Status [Text Block] Income Tax Status Maximum Maximum [Member] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Entity Registrant Name EBP, Contribution Tranche [Axis] EBP, Contribution Tranche [Axis] EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, interest rate ranged Employee Benefit Plan Participant Contribution Pretax Minimum Annual Compensation To Total Compensation Percentage Employee benefit plan participant contribution pretax minimum annual compensation to total compensation percentage. Employee benefit plan, participant contribution, pretax, minimum annual compensation to total compensation, percentage EBP, Investment, Employer, Common Stock, to Total Asset, Percentage Outstanding shares of common stock, percentage EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Axis] EBP, Change in Net Asset Available for Benefit, Decrease Total deductions Employee Benefit Plan Continuing Liability from Disposition of Assets Employee Benefit Plan Continuing Liability from Disposition of Assets. Continuing liability from disposition of assets Fair Value, Inputs, Level 1 [Member] Level 1 EBP, Tax Status [Line Items] Entity Tax Identification Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) NET INCREASE IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Tax Status [Table] EBP, Description, Available [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] T. Rowe Price [Member] Conestoga [Member] Loomis Sayles. Glenmede. Victory [Member] Touchstone [Member] Victory. Glenmede [Member] Touchstone. American Funds [Member] OGE Energy Corp [Member] OGE Energy Corp [Member] T. Rowe Price. American Funds. Fidelity Mgmt. Trust Co. [Member] Fidelity Mgmt. Trust Co. Loomis Sayles [Member] Conestoga.