Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating revenues		$ 2,674.3	$ 3,375.7	$ 3,653.7
Fuel, purchased power and direct transmission expense		911.7	1,662.4	2,127.6
Other operation and maintenance		502.6	501.4	463.1
Depreciation and amortization		506.6	460.9	416.0
Taxes other than income		103.2	101.5	102.8
OPERATING INCOME		650.2	649.5	544.2
Equity in earnings of unconsolidated affiliates	$ 169.8	0.0	0.0	169.8
Gain on Enable/Energy Transfer transaction, net		0.0	0.0	344.4
Gain on equity securities		0.0	282.1	(8.6)
Other income (expense)		44.2	24.0	(21.6)
Interest expense		221.4	166.3	158.3
Income tax expense (benefit)		56.2	123.6	141.2
Net income (loss)		416.8	665.7	737.3
Total assets		12,790.7	12,544.7	12,606.4
Capital expenditures		1,178.2	1,050.9	778.5
Operating Segments [Member] | Electric Company [Member]
Segment Reporting Information [Line Items]
Operating revenues		2,674.3	3,375.7	3,653.7
Fuel, purchased power and direct transmission expense		911.7	1,662.4	2,127.6
Other operation and maintenance		505.0	491.9	464.7
Depreciation and amortization		506.6	460.9	416.0
Taxes other than income		99.4	98.0	99.3
OPERATING INCOME		651.6	662.5	546.1
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		43.5	11.2	7.7
Interest expense		199.9	157.8	152.0
Income tax expense (benefit)		68.8	76.4	41.8
Net income (loss)		426.4	439.5	360.0
Total assets		12,642.6	12,410.5	11,688.0
Capital expenditures		1,178.2	1,050.9	778.5
Operating Segments [Member] | Natural Gas Midstream Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues			0.0	0.0
Fuel, purchased power and direct transmission expense			0.0	0.0
Other operation and maintenance			12.6	1.6
Depreciation and amortization			0.0	0.0
Taxes other than income			0.1	0.2
OPERATING INCOME			(12.7)	(1.8)
Equity in earnings of unconsolidated affiliates				169.8
Gain on Enable/Energy Transfer transaction, net				344.4
Gain on equity securities			282.1
Other income (expense)			10.0	(26.4)
Interest expense			0.0	0.0
Income tax expense (benefit)			48.1	101.0
Net income (loss)			231.3	385.0
Total assets			1.2	786.6
Capital expenditures			0.0	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		(2.4)	(3.1)	(3.2)
Depreciation and amortization		0.0	0.0	0.0
Taxes other than income		3.8	3.4	3.3
OPERATING INCOME		(1.4)	(0.3)	(0.1)
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		8.1	4.9	(2.0)
Interest expense		28.9	10.6	7.2
Income tax expense (benefit)		(12.6)	(0.9)	(1.6)
Net income (loss)		(9.6)	(5.1)	(7.7)
Total assets		301.1	683.7	350.3
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
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		(7.4)	(2.1)	(0.9)
Interest expense		(7.4)	(2.1)	(0.9)
Income tax expense (benefit)		0.0	0.0	0.0
Net income (loss)		0.0	0.0	0.0
Total assets		(153.0)	(550.7)	(218.5)
Capital expenditures		$ 0.0	$ 0.0	$ 0.0