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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Plans and Postretirement Benefit Plans [Abstract]  
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] The details of the funded status of OGE Energy's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans and the amounts included in the balance sheets for 2021 and 2020 are included in the following tables. These amounts have been recorded in Accrued Benefit Obligations with the offset in Accumulated Other Comprehensive
Loss (except OG&E's portion, which is recorded as a regulatory asset as discussed in Note 1) in the balance sheets. The amounts in Accumulated Other Comprehensive Loss and those recorded as a regulatory asset represent a net periodic benefit cost to be recognized in the statements of income in future periods. The benefit obligation for OGE Energy's Pension Plan and the Restoration of Retirement Income Plan represents the projected benefit obligation, while the benefit obligation for the postretirement benefit plans represents the accumulated postretirement benefit obligation. The accumulated postretirement benefit obligation for OGE Energy's Pension Plan and Restoration of Retirement Income Plan differs from the projected benefit obligation in that the former includes no assumption about future compensation levels.

OGE Energy's seconded employee contract with Enable was terminated on December 2, 2021. OGE Energy retains the obligations to the balances and accrued benefits of these former employees as of the termination of the contract.

OGE EnergyOG&E
Pension PlanRestoration of Retirement
Income Plan		Pension PlanRestoration of Retirement
Income Plan
 December 31 (In millions)
20212020202120202021202020212020
Change in benefit obligation      
Beginning obligations$654.6 $616.1 $7.8 $10.3 $484.1 $462.0 $3.0 $6.1 
Service cost11.2 13.2 0.8 0.8 7.7 9.2 — 0.1 
Interest cost13.3 17.0 0.1 0.2 9.7 12.6 — 0.1 
Plan settlements(158.6)(42.8)(4.6)(5.3)(120.4)(33.5)(2.9)(4.5)
Plan amendments— — 1.4 — — — — — 
Plan curtailments— — (0.1)0.2 — — — — 
Special termination benefits— 7.6 — — — 5.1 — — 
Actuarial (gains) losses(3.5)57.7 0.5 1.6 (6.0)41.0 0.4 1.2 
Benefits paid(14.1)(14.2)— — (11.9)(12.3)— — 
Ending obligations$502.9 $654.6 $5.9 $7.8 $363.2 $484.1 $0.5 $3.0 
Change in plans' assets      
Beginning fair value$570.3 $530.3 $— $— $420.3 $399.1 $— $— 
Actual return on plans' assets48.4 77.0 — — 35.0 57.0 — — 
Employer contributions40.0 20.0 4.6 5.3 30.0 10.0 2.9 4.5 
Plan settlements(158.6)(42.8)(4.6)(5.3)(120.4)(33.5)(2.9)(4.5)
Benefits paid(14.1)(14.2)— — (11.9)(12.3)— — 
Ending fair value$486.0 $570.3 $— $— $353.0 $420.3 $— $— 
Funded status at end of year$(16.9)$(84.3)$(5.9)$(7.8)$(10.2)$(63.8)$(0.5)$(3.0)
Accumulated postretirement benefit obligation$475.2 $610.8 $5.4 $6.9 $341.0 $454.7 $0.4 $2.9 

For the year ended December 31, 2021, Pension Plan actuarial gains were primarily due to favorable demographic experience and a higher discount rate. These gains were partially offset by a difference in lump sum interest rates and the long-term assumption for Enable seconded employee terminations and more retirements and terminations than expected with lump sum payouts. For the year ended December 31, 2020, Pension Plan actuarial losses were primarily due to movement in the discount rate, special termination benefits due to a voluntary retirement program offered by OGE Energy and more retirements and terminations than expected which were expected to accelerate lump sum payments in 2021. These losses were partially offset by gains from lowering the interest crediting rate and plan mortality assumptions.
OGE EnergyOG&E
Postretirement Benefit PlansPostretirement Benefit Plans
 December 31 (In millions)
2021202020212020
Change in benefit obligation    
Beginning obligations$144.5 $136.5 $109.5 $104.7 
Service cost0.2 0.2 0.1 0.2 
Interest cost3.4 4.2 2.6 3.2 
Plan curtailments1.9 4.0 — 3.1 
Participants' contributions3.5 3.3 2.6 2.4 
Actuarial (gains) losses(3.7)7.3 (2.5)4.5 
Benefits paid(12.5)(11.0)(9.9)(8.6)
Ending obligations$137.3 $144.5 $102.4 $109.5 
Change in plans' assets    
Beginning fair value$47.6 $47.0 $42.7 $41.9 
Actual return on plans' assets(0.5)1.2 (0.5)1.1 
Employer contributions6.2 7.1 5.0 5.9 
Participants' contributions3.5 3.3 2.6 2.4 
Benefits paid(12.5)(11.0)(9.9)(8.6)
Ending fair value$44.3 $47.6 $39.9 $42.7 
Funded status at end of year$(93.0)$(96.9)$(62.5)$(66.8)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following tables present the net periodic benefit cost components, before consideration of capitalized amounts, of OGE Energy's Pension Plan, Restoration of Retirement Income Plan and postretirement benefit plans that are included in the financial statements. Service cost is presented within Other Operation and Maintenance Expense, and the remaining net period benefit cost components as listed in the following tables are presented within Other Net Periodic Benefit Expense in the statements of income. OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker in the regulatory assets and liabilities table in Note 1 and within Other Net Periodic Benefit Expense in the statements of income.
OGE EnergyOG&E
Pension PlanRestoration of Retirement
Income Plan		Pension PlanRestoration of Retirement
Income Plan
Year Ended December 31
(In millions)
202120202019202120202019202120202019202120202019
Service cost$11.2 $13.2 $12.9 $0.8 $0.8 $0.5 $7.7 $9.2 $9.0 $— $0.1 $0.2 
Interest cost13.3 17.0 20.7 0.1 0.2 0.4 9.7 12.6 15.6 — 0.1 0.2 
Expected return on plan assets(34.1)(37.6)(36.1)— — — (24.7)(27.9)(27.6)— — — 
Amortization of net loss9.4 17.1 17.3 0.2 0.5 0.5 7.0 12.1 12.9 0.1 0.4 0.3 
Plan curtailments— — — — 0.2 — — — — — — — 
Special termination benefits— 7.6 — — — — — 5.1 — — — — 
Amortization of unrecognized prior service cost (A)— — — 0.1 — — — — — — — — 
Settlement cost41.3 14.1 27.6 2.1 2.7 0.5 33.1 11.4 16.4 1.6 2.4 0.5 
Total net periodic benefit cost41.1 31.4 42.4 3.3 4.4 1.9 32.8 22.5 26.3 1.7 3.0 1.2 
Less: Amount paid by unconsolidated affiliates (B)(0.2)2.0 2.9 0.1 0.1 0.1 
Plus: Amount allocated from OGE Energy (B)6.5 5.9 4.5 1.5 1.3 0.5 
Net periodic benefit cost$41.3 $29.4 $39.5 $3.2 $4.3 $1.8 $39.3 $28.4 $30.8 $3.2 $4.3 $1.7 
(A)Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
(B)"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

In conjunction with the net periodic benefit cost amounts recognized, as presented in the table above, for the Pension and Restoration of Retirement Income Plans in 2021, 2020 and 2019, the Registrants recognized the following:
Year Ended December 31 (In millions)
202120202019
Increase of regulatory asset related to pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)$23.0 $13.8 $16.1 
Deferral of pension expense related to pension settlement, curtailment and special termination benefits charges included in the above line item:
Oklahoma jurisdiction (A)$37.9 $21.6 $17.9 
Arkansas jurisdiction (A)$3.5 $2.0 $1.7 
(A)Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
OGE EnergyOG&E
Postretirement Benefit PlansPostretirement Benefit Plans
Year Ended December 31 (In millions)
202120202019202120202019
Service cost$0.2 $0.2 $0.2 $0.1 $0.2 $0.2 
Interest cost3.4 4.2 5.6 2.6 3.2 4.3 
Expected return on plan assets(1.8)(1.8)(1.9)(1.7)(1.7)(1.7)
Amortization of net loss2.8 2.0 2.0 2.7 2.1 2.1 
Plan curtailments— 1.5 — — 1.3 — 
Amortization of unrecognized prior service cost (A)(6.9)(8.4)(8.4)(5.0)(6.1)(6.1)
Total net periodic benefit income(2.3)(2.3)(2.5)(1.3)(1.0)(1.2)
Less: Amount paid by unconsolidated affiliates (B)(0.5)(0.7)(0.6)
Plus: Amount allocated from OGE Energy (B)(0.5)(0.5)(0.6)
Net periodic benefit income$(1.8)$(1.6)$(1.9)$(1.8)$(1.5)$(1.8)
(A)Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
(B)"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

In conjunction with the net periodic benefit income amounts recognized, as presented in the table above, for the postretirement benefit plans in 2021, 2020 and 2019, the Registrants recognized the following:
Year Ended December 31 (In millions)
202120202019
Increase of regulatory liability related to postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)$0.4 $0.2 $1.0 
Deferral of postretirement expense related to postretirement plan curtailment charges included in the above line item:
Oklahoma jurisdiction (A)$— $(1.4)$— 
Arkansas jurisdiction (A)$— $(0.1)$— 
(A)Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]
The following table presents the amount of net periodic benefit cost capitalized and attributable to each of the Registrants for OGE Energy's Pension Plan and postretirement benefit plans in 2021, 2020 and 2019.
OGE EnergyOG&E
(In millions)202120202019202120202019
Capitalized portion of net periodic pension benefit cost$3.4 $3.8 $3.6 $2.9 $3.1 $3.0 
Capitalized portion of net periodic postretirement benefit cost$0.2 $0.2 $0.2 $0.1 $0.1 $0.1 
Schedule of Assumptions Used [Table Text Block] Rate Assumptions
Pension Plan and
Restoration of Retirement Income Plan		Postretirement
Benefit Plans
Year Ended December 31202120202019202120202019
Assumptions to determine benefit obligations:
Discount rate2.75 %2.30 %3.15 %2.80 %2.45 %3.25 %
Rate of compensation increase4.20 %4.20 %4.20 %N/AN/AN/A
Interest crediting rate3.50 %3.50 %4.00 %N/AN/AN/A
Assumptions to determine net periodic benefit cost:
Discount rate2.63 %2.88 %3.63 %2.45 %3.25 %4.30 %
Expected return on plan assets7.00 %7.50 %7.50 %4.00 %4.00 %4.00 %
Rate of compensation increase4.20 %4.20 %4.20 %N/AN/AN/A
Interest crediting rate3.50 %4.00 %4.00 %N/AN/AN/A
N/A - not applicable
Projected Benefit Obligation Funded Status Thresholds [Table Text Block]
The Pension Plan assets are held in a trust which follows an investment policy and strategy designed to reduce the funded status volatility of the Plan by utilizing liability driven investing. The purpose of liability-driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The investment policy follows a glide path approach that shifts a higher portfolio weighting to fixed income as the Plan's funded status increases. The following table presents the targeted fixed income and equity allocations at different funded status levels.
Projected Benefit Obligation Funded Status Thresholds<90%95%100%105%110%115%120%
Fixed income50%58%65%73%80%85%90%
Equity50%42%35%27%20%15%10%
Total100%100%100%100%100%100%100%
Pension Plan Equity Asset Allocation Table [Table Text Block]
Within the portfolio's overall allocation to equities, the funds are allocated according to the guidelines in the following table.
        Asset ClassTarget AllocationMinimumMaximum
Domestic Large Cap Equity40%35%60%
Domestic Mid-Cap Equity15%5%25%
Domestic Small-Cap Equity25%5%30%
International Equity20%10%30%
Schedule of Allocation of Plan Assets [Table Text Block]
The following tables present the postretirement benefit plans' investments that are measured at fair value on a recurring basis at December 31, 2021 and 2020. There were no Level 2 investments held by the postretirement benefit plans at December 31, 2021 and 2020.
(In millions)December 31, 2021Level 1Level 3
Group retiree medical insurance contract$28.1 $— $28.1 
Mutual funds16.2 16.2 — 
Total OGE Energy plan investments$44.3 $16.2 $28.1 
Plan investments attributable to affiliates(4.4)
Total OG&E plan investments$39.9 
(In millions)December 31, 2020Level 1Level 3
Group retiree medical insurance contract$33.4 $— $33.4 
Mutual funds14.2 14.2 — 
Total OGE Energy plan investments$47.6 $14.2 $33.4 
Plan investments attributable to affiliates(4.9)
Total OG&E plan investments$42.7 
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The following table presents a reconciliation of the postretirement benefit plans' investments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
Year Ended December 31 (In millions)
2021
Group retiree medical insurance contract:
Beginning balance$33.4 
Claims paid(4.9)
Net unrealized losses related to instruments held at the reporting date(1.1)
Investment fees(0.1)
Realized losses(0.1)
Interest income0.7 
Dividend income0.2 
Ending balance$28.1 
Schedule of Expected Benefit Payments [Table Text Block]
The following table presents the benefit payments the Registrants expect to pay related to the Pension Plan and Restoration of Retirement Income Plan. These expected benefits are based on the same assumptions used to measure OGE Energy's benefit obligation at the end of the year and include benefits attributable to estimated future employee service. 
 
(In millions)
OGE EnergyOG&E
2022$95.3 $38.8 
2023$37.0 $30.7 
2024$38.4 $30.6 
2025$36.7 $28.7 
2026$35.2 $28.3 
2027-2031$167.4 $126.6 
The Medicare Prescription Drug, Improvement and Modernization Act of 2003 expanded coverage for prescription drugs. The following table presents the gross benefit payments the Registrants expect to pay related to the postretirement benefit plans, including prescription drug benefits.
(In millions)OGE EnergyOG&E
2022$12.5 $9.6 
2023$12.2 $9.3 
2024$10.6 $8.0 
2025$10.1 $7.6 
2026$9.7 $7.2 
After 2026$40.3 $30.2 
Defined Benefit Plan, Plan Assets, Category
The following tables present the Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2021 and 2020. There were no Level 3 investments held by the Pension Plan at December 31, 2021 and 2020.
(In millions)December 31, 2021Level 1Level 2Net Asset Value (A)
Common stocks$86.1 $86.1 $— $— 
U.S. Treasury notes and bonds (B)135.2 135.2 — — 
Mortgage- and asset-backed securities24.6 — 24.6 — 
Corporate fixed income and other securities107.0 — 107.0 — 
Commingled fund (C)23.6 — — 23.6 
Foreign government bonds0.9 — 0.9 — 
U.S. municipal bonds1.4 — 1.4 — 
Money market fund 5.5 — — 5.5 
Mutual fund99.8 99.8 — — 
Preferred stocks 1.1 1.1 — — 
U.S. Treasury futures:
Cash collateral0.6 0.6 — — 
Forward contracts:
Receivable (foreign currency)0.1 — 0.1 — 
Total Pension Plan investments485.9 $322.8 $134.0 $29.1 
Interest and dividends receivable2.1   
Payable to broker for securities purchased(2.0)  
Total OGE Energy Pension Plan assets$486.0   
Pension Plan investments attributable to affiliates(133.0)
Total OG&E Pension Plan assets$353.0 
(A)GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.
(B)This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
(C)This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
(In millions)December 31, 2020Level 1Level 2Net Asset Value (A)
Common stocks$252.3 $252.3 $— $— 
U.S. Treasury notes and bonds (B)134.3 134.3 — — 
Mortgage- and asset-backed securities29.3 — 29.3 — 
Corporate fixed income and other securities116.6 — 116.6 — 
Commingled fund (C)25.4 — — 25.4 
Foreign government bonds4.6 — 4.6 — 
U.S. municipal bonds1.8 — 1.8 — 
Money market fund 8.8 — — 8.8 
Mutual fund9.2 9.2 — — 
Preferred stocks0.6 0.6 — — 
U.S. Treasury Futures:
Cash collateral 0.7 0.7 — — 
Forward contracts:
Receivable (foreign currency)0.1 — 0.1 — 
Total Pension Plan investments583.7 $397.1 $152.4 $34.2 
Receivable from broker for securities sold0.2   
Interest and dividends receivable2.2   
Payable to broker for securities purchased(15.8)  
Total OGE Energy Pension Plan assets$570.3   
Pension Plan investments attributable to affiliates(150.0)
Total OG&E Pension Plan assets$420.3 
(A)GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.
(B)This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
(C)This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.