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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Stock-Based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the years ended December 31, 2021, 2020 and 2019 related to performance units and restricted stock units for the Registrants' employees.
OGE EnergyOG&E
Year Ended December 31 (In millions)
202120202019202120202019
Performance units:   
Total shareholder return$7.5 $7.9 $8.7 $1.8 $2.3 $3.0 
Earnings per share— 1.0 4.3 — 0.3 1.5 
Total performance units7.5 8.9 13.0 1.8 2.6 4.5 
Restricted stock units2.3 0.9 0.9 0.4 0.4 0.4 
Total compensation expense$9.8 $9.8 $13.9 $2.2 $3.0 $4.9 
Income tax benefit$2.5 $2.5 $3.6 $0.6 $0.8 $1.3 
Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block] The following table presents the number of performance units granted based on total shareholder return and the assumptions used to calculate the grant date fair value of the performance units based on total shareholder return.
OGE EnergyOG&E
 202120202019202120202019
Number of units granted249,909201,552208,64768,72067,97568,396
Fair value of units granted$38.14$38.03$47.00$38.14$38.03$47.00
Expected dividend yield4.7 %3.5 %4.0 %4.7 %3.5 %4.0 %
Expected price volatility29.0 %15.0 %17.0 %29.0 %15.0 %17.0 %
Risk-free interest rate0.22 %1.17 %2.47 %0.22 %1.17 %2.47 %
Expected life of units (in years)
2.842.852.862.852.852.86
Restricted Stock Valuation Assumptions [Table Text Block] The following table presents the number of restricted stock units granted and the grant date fair value.
OGE EnergyOG&E
 202120202019202120202019
Restricted stock units granted89,197 67,193 75,929 22,911 22,665 26,141 
Fair value of restricted stock units granted$31.11 $43.69 $41.71 $30.91 $43.69 $41.63 
Share-based Compensation, Activity [Table Text Block]
The following tables present a summary of the activity for the Registrants' performance units and restricted stock units for the year ended December 31, 2021. The table designated as "OGE Energy" below includes the OG&E standalone activity, as OGE Energy represents consolidated results.
OGE EnergyPerformance UnitsRestricted
Stock Units
Total Shareholder ReturnEarnings Per Share
(Dollars in millions)Number
of Units		Aggregate Intrinsic ValueNumber
of Units		Aggregate Intrinsic ValueNumber
of Shares		Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20612,262 79,002 124,919 
Granted249,909 (A)— 89,197 
Converted(236,990)(B)$5.4 (79,002)(B)$2.7 — 
VestedN/AN/A(53,274)$2.2 
Forfeited(43,929)— (27,171)
Units/shares outstanding at 12/31/21581,252 $17.5 — $— 133,671 $5.1 
Units/shares fully vested at 12/31/21172,748 $— — $— 47,907$2.0 
OG&EPerformance UnitsRestricted
Stock Units
Total Shareholder ReturnEarnings Per Share
(Dollars in millions)Number
of Units		Aggregate Intrinsic ValueNumber
of Units		Aggregate Intrinsic ValueNumber
of Shares		Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20182,363 25,235 34,130 
Granted68,720 (A)— 22,911 
Converted(75,693)(B)$1.7 (25,235)(B)$0.8 — 
VestedN/AN/A(12,461)$0.6 
Forfeited(14,132)— (8,986)
Employee migration52 (C)— (C)19 (C)
Units/shares outstanding at 12/31/21161,310 $4.8 — $— 35,613 $1.4 
Units/shares fully vested at 12/31/2148,195 $— — $— 11,241$0.5 
(A)For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
(B)These amounts represent performance units that vested at December 31, 2020 which were settled in February 2021.
(C)Due to certain employees transferring between OG&E and OGE Energy.
Schedule of Nonvested Share Activity [Table Text Block]
The following tables present a summary of the activity for the Registrants' non-vested performance units and restricted stock units for the year ended December 31, 2021. The table designated as "OGE Energy" below includes the OG&E standalone activity, as OGE Energy represents consolidated results.
OGE EnergyPerformance Units -Restricted
Stock Units
Total Shareholder Return
Number
of Units		Weighted-Average
Grant Date
Fair Value		Number
of Shares		Weighted-Average
Grant Date
Fair Value
Units/shares non-vested at 12/31/20375,272 $42.51 124,919 $42.69 
Granted249,909 (A)$38.14 89,197 $31.11 
Vested(172,748)$47.00 (53,274)$41.59 
Forfeited(43,929)$41.02 (27,171)$42.37 
Units/shares non-vested at 12/31/21408,504 $38.05 133,671 $35.64 
OG&EPerformance Units -Restricted
Stock Units
Total Shareholder Return
Number
of Units		Weighted-Average
Grant Date
Fair Value		Number
of Shares		Weighted-Average
Grant Date
Fair Value
Units/shares non-vested at 12/31/20106,670 $42.49 34,130 $42.67 
Granted68,720 (A)$38.14 22,911 $30.91 
Vested(48,195)$47.00 (12,461)$45.67 
Forfeited(14,132)$41.12 (8,986)$42.51 
Employee migration52 (B)$41.01 19 (B)$37.71 
Units/shares non-vested at 12/31/21113,115 $38.10 35,613 $35.52 
(A)For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
(B)Due to certain employees transferring between OG&E and OGE Energy.
Fair Value of Vested Performance Units and Restricted Stock [Table Text Block]
The following table presents a summary of the Registrants' fair value for vested performance units and restricted stock units.
OGE EnergyOG&E
Year Ended December 31 (In millions)
202120202019202120202019
Performance units:
Total shareholder return$8.1 $8.7 $9.3 $2.3 $2.8 $3.2 
Earnings per share$— $2.5 $5.2 $— $0.8 $0.9 
Restricted stock units$2.2 $0.1 $0.1 $0.5 $0.1 $— 
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table presents a summary of the Registrants' unrecognized compensation cost for non-vested performance units and restricted stock units and the weighted-average periods over which the compensation cost is expected to be recognized.
OGE EnergyOG&E
December 31, 2021
Unrecognized Compensation Cost (In millions)
Weighted Average to be Recognized (In years)
Unrecognized Compensation Cost (In millions)
Weighted Average to be Recognized (In years)
Performance units - total shareholder return$7.5 1.71$2.0 1.72
Restricted stock units3.5 1.480.8 1.39
Total unrecognized compensation cost$11.0 $2.8