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Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating revenues $ 2,985.3 $ 2,674.3 $ 3,375.7
Fuel, purchased power and direct transmission expense 1,076.4 911.7 1,662.4
Other operation and maintenance 514.4 502.6 501.4
Depreciation and amortization 539.5 506.6 460.9
Taxes other than income 109.7 103.2 101.5
OPERATING INCOME 745.3 650.2 649.5
Gain on equity securities 0.0 0.0 282.1
Other income 29.8 44.2 24.0
Interest expense 254.5 221.4 166.3
Income tax expense (benefit) 79.1 56.2 123.6
Net income (loss) 441.5 416.8 665.7
Total assets 13,716.0 12,790.7 12,544.7
Capital expenditures 1,090.9 1,178.2 1,050.9
Operating Segments [Member] | Electric Company [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 2,985.3 2,674.3 3,375.7
Fuel, purchased power and direct transmission expense 1,076.4 911.7 1,662.4
Other operation and maintenance 514.1 505.0 491.9
Depreciation and amortization 539.5 506.6 460.9
Taxes other than income 109.7 99.4 98.0
OPERATING INCOME 745.6 651.6 662.5
Gain on equity securities     0.0
Other income 31.9 43.5 11.2
Interest expense 214.4 199.9 157.8
Income tax expense (benefit) 93.2 68.8 76.4
Net income (loss) 469.9 426.4 439.5
Total assets 13,581.3 12,642.6 12,410.5
Capital expenditures 1,090.9 1,178.2 1,050.9
Operating Segments [Member] | Natural Gas Midstream Operations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues [1]     0.0
Fuel, purchased power and direct transmission expense [1]     0.0
Other operation and maintenance [1]     12.6
Depreciation and amortization [1]     0.0
Taxes other than income [1]     0.1
OPERATING INCOME [1]     (12.7)
Gain on equity securities [1]     282.1
Other income [1]     10.0
Interest expense [1]     0.0
Income tax expense (benefit) [1]     48.1
Net income (loss) [1]     231.3
Total assets [1]     1.2
Capital expenditures [1]     0.0
Operating Segments [Member] | Other Operations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0.0 0.0 0.0
Fuel, purchased power and direct transmission expense 0.0 0.0 0.0
Other operation and maintenance 0.3 (2.4) (3.1)
Depreciation and amortization 0.0 0.0 0.0
Taxes other than income 0.0 3.8 3.4
OPERATING INCOME (0.3) (1.4) (0.3)
Gain on equity securities     0.0
Other income 2.4 8.1 4.9
Interest expense 44.6 28.9 10.6
Income tax expense (benefit) (14.1) (12.6) (0.9)
Net income (loss) (28.4) (9.6) (5.1)
Total assets 402.9 301.1 683.7
Capital expenditures 0.0 0.0 0.0
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0.0 0.0 0.0
Fuel, purchased power and direct transmission expense 0.0 0.0 0.0
Other operation and maintenance 0.0 0.0 0.0
Depreciation and amortization 0.0 0.0 0.0
Taxes other than income 0.0 0.0 0.0
OPERATING INCOME 0.0 0.0 0.0
Gain on equity securities     0.0
Other income (4.5) (7.4) (2.1)
Interest expense (4.5) (7.4) (2.1)
Income tax expense (benefit) 0.0 0.0 0.0
Net income (loss) 0.0 0.0 0.0
Total assets (268.2) (153.0) (550.7)
Capital expenditures $ 0.0 $ 0.0 $ 0.0
[1] (A) During 2022, OGE Energy held an investment in Energy Transfer's equity securities and reported the investment's activity, as well as Enable legacy pension and postretirement costs, through the natural gas midstream operations segment. As of the end of September 2022, OGE Energy sold all of Energy Transfer's limited partner units; therefore, beginning in 2023, OGE Energy no longer has a natural gas midstream operations segment.