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Summary of Significant Accounting Policies - Schedule of Jointly Owned Utility Plants (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 17,068.8 $ 16,110.4
Accumulated Depreciation 4,982.2 4,809.4
Net property, plant and equipment $ 12,086.6 $ 11,301.0
McClain Plant [Member]    
Property, Plant and Equipment [Line Items]    
Jointly Owned Utility Plant, Proportionate Ownership Share 77.00% [1] 77.00% [2]
Property, Plant and Equipment, Gross $ 244.4 [1] $ 265.4 [2]
Accumulated Depreciation 75.8 [1] 129.2 [2]
Net property, plant and equipment $ 168.6 [1] $ 136.2 [2]
Redbud Plant [Member]    
Property, Plant and Equipment [Line Items]    
Jointly Owned Utility Plant, Proportionate Ownership Share 51.00% [1],[3] 51.00% [2],[4]
Property, Plant and Equipment, Gross $ 556.7 [1],[3] $ 548.9 [2],[4]
Accumulated Depreciation 247.7 [1],[3] 245.5 [2],[4]
Net property, plant and equipment 309.0 [1],[3] 303.4 [2],[4]
OGE Energy [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6.1 6.1
Accumulated Depreciation 0.0 0.0
Net property, plant and equipment 6.1 6.1
OG&E [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 17,062.7 16,104.3
Accumulated Depreciation 4,982.2 4,809.4
Net property, plant and equipment 12,080.5 11,294.9
OG&E [Member] | Electric Transmission and Distribution [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,654.5 6,290.1
Accumulated Depreciation 1,639.8 1,564.3
Net property, plant and equipment 5,014.7 4,725.8
OG&E [Member] | Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,518.5 [5] 5,295.9 [6]
Accumulated Depreciation 2,145.9 [5] 2,081.0 [6]
Net property, plant and equipment 3,372.6 [5] 3,214.9 [6]
OG&E [Member] | Electric Transmission [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,432.1 [7] 3,306.7 [8]
Accumulated Depreciation 748.5 [7] 707.6 [8]
Net property, plant and equipment 2,683.6 [7] 2,599.1 [8]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 752.3 568.5
Accumulated Depreciation 203.7 219.8
Net property, plant and equipment 548.6 348.7
OG&E [Member] | Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 705.3 643.1
Accumulated Depreciation 244.3 236.7
Net property, plant and equipment $ 461.0 $ 406.4
[1] Construction work in progress was $0.8 million and $5.1 million for the McClain and Redbud Plants, respectively.
[2] Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.
[3] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million.
[4] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[5] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million.
[6] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[7] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.2 million.
[8] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.