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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2021
Income Taxes [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The following table presents the components of income tax expense (benefit).
OGE EnergyOG&E
Year Ended December 31 (In millions)
202120202019202120202019
Provision (benefit) for current income taxes:    
Federal$16.4 $8.4 $(6.4)$(9.0)$(3.8)$(7.9)
State1.7 0.5 5.1 9.0 (0.6)4.1 
Total provision (benefit) for current income taxes 18.1 8.9 (1.3)— (4.4)(3.8)
Provision (benefit) for deferred income taxes, net:    
Federal133.1 (105.2)48.5 58.3 45.7 37.7 
State(10.0)(31.1)(17.4)(16.5)(6.6)(13.8)
Total provision (benefit) for deferred income taxes, net 123.1 (136.3)31.1 41.8 39.1 23.9 
Total income tax expense (benefit)$141.2 $(127.4)$29.8 $41.8 $34.7 $20.1 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table presents a reconciliation of the statutory tax rates to the effective income tax rate.
OGE EnergyOG&E
Year Ended December 31202120202019202120202019
Statutory federal tax rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income taxes, net of federal income tax
benefit		0.9 (1.4)(1.2)(1.4)(1.6)(1.8)
Stock-based compensation0.1 (0.3)(1.2)— — — 
Executive compensation limitation0.1 0.2 0.2 — — — 
Amortization of net unfunded deferred taxes(2.1)(4.4)(4.5)(4.6)(4.8)(5.6)
Federal renewable energy credit (A)(2.0)(5.0)(6.0)(4.4)(5.4)(7.6)
Remeasurement of state deferred taxes due to Energy Transfer merger (B)(1.1)— — — — — 
Remeasurement of state deferred tax liabilities(0.6)0.9 (0.8)— — — 
401(k) dividends(0.2)(0.4)(0.4)— — — 
Impairment of OGE Energy's investment in Enable (C)— 31.6 — — — — 
Other— 0.1 (0.7)(0.2)0.1 (0.6)
Effective income tax rate16.1 %42.3 %6.4 %10.4 %9.3 %5.4 %
(A)Represents credits primarily associated with the production from OG&E's wind farms.
(B)In connection with the Enable and Energy Transfer merger, the state income tax rates are expected to decrease, as Energy Transfer operates in significantly more states with generally lower tax rates than the historic Enable operating area.
(C)As further discussed in Note 5, OGE Energy recorded a $780.0 million impairment on its investment in Enable in March 2020, which resulted in a tax benefit being recorded that caused a significant variance to the effective tax rate. This variance has been presented in the table as a single line item in order to facilitate comparability of other components of the effective tax rate.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] The following table presents the components of Deferred Income Taxes at December 31, 2021 and 2020.
OGE EnergyOG&E
December 31 (In millions)
2021202020212020
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences$1,677.3 $1,721.2 $1,677.3 $1,721.2 
Investment in Enable— 302.6 — — 
Investment in Energy Transfer's equity securities363.5 — — — 
Regulatory assets52.1 52.3 52.1 52.3 
Pension Plan10.7 3.9 32.0 27.4 
Other7.4 (1.4)(4.7)(6.5)
Derivative instruments2.2 1.7 — — 
Bond redemption-unamortized costs1.8 2.0 1.8 2.0 
Income taxes recoverable from customers, net(225.8)(221.8)(225.8)(221.8)
State tax credits(221.2)(204.4)(205.9)(189.0)
Federal tax credits(208.4)(236.6)(209.8)(236.6)
Regulatory liabilities(72.0)(81.0)(72.0)(81.0)
Asset retirement obligations(19.4)(20.3)(19.4)(20.3)
Postretirement medical and life insurance benefits(19.2)(22.4)(13.0)(15.3)
Accrued liabilities(9.5)(9.6)(7.3)(5.2)
Deferred federal investment tax credits(3.1)(2.7)(3.1)(2.7)
Net operating losses(1.0)(12.0)— (1.4)
Accrued vacation(1.5)(2.2)(1.2)(1.6)
Uncollectible accounts(0.6)(0.7)(0.6)(0.7)
Total deferred income tax liabilities, net$1,333.3 $1,268.6 $1,000.4 $1,020.8 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
The following table presents a reconciliation of the Registrants' total gross unrecognized tax benefits as of the years ended December 31, 2021, 2020 and 2019.
(In millions)202120202019
Balance at January 1$21.9 $20.7 $20.7 
Tax positions related to current year:
Additions1.7 1.2 — 
Reductions(1.2)— — 
Balance at December 31$22.4 $21.9 $20.7 
Summary of Tax Credit Carryforwards [Table Text Block] The following table presents a summary of these carry forwards.
OGE EnergyOG&E
(In millions)Carry Forward AmountDeferred Tax AssetCarry Forward AmountDeferred Tax AssetEarliest Expiration Date
State operating loss$33.4 $1.0 $— $— 2032
Federal tax credits$208.4 $208.4 $209.8 $209.8 2032
State tax credits:
Oklahoma investment tax credits$227.1 $179.4 $207.8 $164.2 N/A
Oklahoma capital investment board credits$12.8 $12.8 $12.8 $12.8 N/A
Oklahoma zero emission tax credits$37.5 $28.9 $37.5 $28.9 2021
Louisiana inventory credits$0.1 $0.1 $— $— 2032
N/A - not applicable

Oklahoma Corporate Tax Rate Change

In May 2021, Oklahoma enacted a reduction of the corporate income tax rate to four percent from the previous six percent. This rate reduction took effect on January 1, 2022. ASC 740, "Income Taxes," requires deferred tax assets and liabilities to be measured at the enacted tax rate expected to apply when temporary differences are to be realized or settled. Therefore, during the second quarter of 2021, the Registrants revalued state deferred tax liabilities to reflect this change in tax rate. For entities subject to ASC 980, "Accounting for Regulated Entities," such as OG&E, those entities are required to recognize a regulatory liability for the decrease in taxes payable for the change in tax rates that are expected to be returned to customers through future rates and to recognize a regulatory asset for the increase in taxes receivable for the change in tax rates that are expected to be recovered from customers through future rates. The revaluation resulted in a regulatory liability of $97.7 million recorded for OG&E and an income tax benefit of $6.6 million for OGE Energy related to Enable and other operations (holding company) for the year ended December 31, 2021.